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Simulating VAWT Startup
Posted by: sjh7132

Video duration: 297 seconds

This video shows a new software tool I wrote that lets me simulate and check for VAWT startup problems.

Related: sience, free, energy, vawt, turbine, wind, startup, power, naca0020, s1223

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Latest comments made on this video:

@lordvon64 I'm ...
By: sjh7132. on 08 Sep 10, 01:38:40
@lordvon64 I'm running a laminar flow simulation and I should really be modeling turbulent flow. So my upwind drag isn't as high as it should be, making the power numbers kind of high. The general behavior of the turbine and relative powers to other turbines seems to be pretty good. I'm using OF1.5-dev with GGI.

I am an aspiring ...
By: lordvon64. on 08 Sep 10, 00:20:41
I am an aspiring OpenFOAMer, and this video is inspiring. What version are you using? Are you using either ggi or sliding interface? Do you have any validation data?

@itsandbits1 No ...
By: sjh7132. on 23 Aug 10, 16:13:38
@itsandbits1 No this video was about trying to figure out why VAWTs don't start. I do plan to do a bunch of standardized test, and those will have "Spinoff" in the title, and will be run at standard wind speeds

ok sorry, I thought ...
By: itsandbits1. on 23 Aug 10, 16:11:33
ok sorry, I thought you were doing standardized tests with the only variable being the blade.

at 3:28 it shows 37 ...
By: itsandbits1. on 23 Aug 10, 16:07:09
at 3:28 it shows 37 rpm for a tsr of 1.25 and then at 4:36 it shows a rpm of 38 for a tsr of .45 If the wind speed and the diameter is not changed; as you say this is a standardized test, then this is what I question

@itsandbits1 Wind ...
By: sjh7132. on 23 Aug 10, 16:06:24
@itsandbits1 Wind speed was not the same. Listen to what I say and read the text at 2:09, which is about the second run (5mph). Then read the text at 3:41 which is about the last run (15 mph). Same rpm, 3x the wind speed = 1/3rd the TSR.

at 3:27 it shows 37 ...
By: itsandbits1. on 23 Aug 10, 16:02:36
at 3:27 it shows 37 rpm for a tsr of 1.25 then at 4:35 it shows 38 rpm for a tsr of .45???? If the wind speed is the same for all of them and the dia is the same for LL OF THEM ???? THIS IS WHAT i QUESTION

The last two had ...
By: sjh7132. on 23 Aug 10, 01:18:17
The last two had very close RPMs, but run #2 was 5 MPH wind and the last one was 15 MPH wind.

why, if the dia. ...
By: itsandbits1. on 23 Aug 10, 01:10:09
why, if the dia. wind spd , and rpm is the same, is there a high tsr for one profile compared to another. I thought the variables: wind speed, rpm diameter were the factors to get tsr. The last two examples are 60"at 15 mph and the rpm is as close as you can get , yet one is over 1.25 and the other is less than .5?????

Nice video.
By: Aceman307. on 19 Aug 10, 22:43:40
Nice video.

Great vid you ...
By: TK42138. on 19 Aug 10, 09:26:25
Great vid you obviously have a talent.

Testing on the pole
Posted by: sjh7132

Video duration: 215 seconds

This is the 3rd part of testing my VAWT, this time on the pole. Power was not impressive, but I think that may be the fault of my alternator which has a huge air gap and high resistance coils.

Related: wind, turbine, vawt, free, power, science, engineering, alternator, naca0020, naca, lift, danarious

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Very nice. Bravo :) ...
By: Zypkin. on 21 Jul 10, 22:08:53
Very nice. Bravo :) since U are just testing and U dont generate much power, you could try reducing the diameter of the turbine and get some more speed (and voltage). ...and maybe get a serious pole??? :)))

@rikkiesix Yes, ...
By: sjh7132. on 19 Jul 10, 02:40:17
@rikkiesix Yes, axial flux, but I didn't do a good job on it. My stator is very warpped because I didn't clamp it down when I poured it. I will do better next time. I got the magnets from the windstuffnow site. When I build an alt that works well, I'll post the specs. This one is not worth duplicating.

@emagnets Sam are ...
By: sjh7132. on 19 Jul 10, 02:37:52
@emagnets Sam are you still working on your left type VAWT? I have to say, when something with a 5 ft diameter is spinning above your head at 200 RPM, it's SCARY! I'm just glade mine is Styrofoam and light aluminum. If it was wood I think I would have ran for cover.

@Caleb6543 Yes, ...
By: sjh7132. on 19 Jul 10, 02:36:27
@Caleb6543 Yes, I'm a Trekie. I was thinking that a lenz inner VAWT with some outboard lift blades that were match properly could be a killer combination.

from what I can see ...
By: itsandbits1. on 19 Jul 10, 01:35:29
from what I can see of your airfoil I think it is a high performance blade and needs a lot more wind but opening up the angle of attack might give it a little more at the lower wind speed. try maybe 3-5 degrees out and if that doesn't work try in. I think you need to get up in the air with alot more structure on the blade mounts and pole. keep it up though cause the never stops. It just goes somewhere else when u need it

Hi, is your ...
By: rikkiesix. on 19 Jul 10, 01:01:38
Hi, is your generator a axial flux one? What wire and how many rounds did you use if so. And how stong are your magnets? By the way, great progress. Keep it up Greetings Erik

i like it. true. ...
By: emagnets. on 19 Jul 10, 00:40:50
i like it. true. The mass (weight) does help the rotation. light blades need the rpm. not bad dude. i wish i had the open land/space. I live in a valley full of trees. great works. sam

Congratulation! ...
By: Caleb6543. on 19 Jul 10, 00:07:38
Congratulation! That's a big turbine for such a small pole. That may be an advantage of lift type blades ... not much area for side loading. Did I hear right that the blades drop out of warp; could be a good new technical term. :-) Based on your results, I think I want to try augmenting my Savonius turbine with some lifting blades at say 3x the diameter.

@itsandbits1 The ...
By: sjh7132. on 18 Jul 10, 23:42:54
@itsandbits1 The AOA is 0 degrees. (mounted at the 40% point of the wing.). I'd guess the wind was about 15 mph. TSR was about 2.3.

whats the angle of ...
By: itsandbits1. on 18 Jul 10, 22:27:22
whats the angle of attack on your blades??? Is the tip towards the center or away? definately should be getting more power. at 200 rpm it should at least do 50-80 watts for a medium speed range unit higher for a low speed.. By the way how fast was the wind blowing?

More VAWT Experiments
Posted by: sjh7132

Video duration: 580 seconds

This video show experiments I did with various VAWT configurations.

Related: vawt, wind, turbine, free, energy, engineering, science, air, foil, s1223, naca, 0020, power

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Testing the 3/4 Elliptical blade VAWT
Posted by: sjh7132

Video duration: 135 seconds

Test of my elliptical blade VAWT. The blades have a chord of 8 long and 3.2 inches thick. The outside back quarter of the ellipse is removed.

Related: vawt, turbine, wind, energy, science, power

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Analysis of the LynxSteam Turbine
Posted by: sjh7132

Video duration: 310 seconds

Analysis of the LynxSteam Turbine done with OpenFoam-1.5-dev. The mesh was made with gmsh. The results look good, and so does the turbine.

Related: science, engineering, free, energy, turbine, wind, vawt, cfd, openfoam, mesh, renewable

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Analysis of a Magnet Motor Part 3
Posted by: sjh7132

Video duration: 454 seconds

This is an in depth analysis of a magnet motor experiment by James Roney. I try to show that everything happening can be explained with physics and no energy is being created.

Related: science, physics, free, energy, potential, kinetic, magnet, motor, freemagneticenergy

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Latest comments made on this video:

@ssheetz78 That ...
By: sjh7132. on 26 Aug 10, 01:41:02
@ssheetz78 That type of shielding does no good. Even if you completely hide the south pole. As a magnet rotates around it will see the north pole on the way in, and that same north pole on the way out. The energy you put into (or get from) the magnet on the way in, is the same as the way out. Another way to do what this shielding is doing is just use a long magnet and keep one end far away from the wheel. Still doesn't help.

@sjh7132 this ...
By: ssheetz78. on 26 Aug 10, 01:24:27
@sjh7132 this domain name + watch?v=rjr94ha7W8w

@sjh7132 Thanks ...
By: ssheetz78. on 26 Aug 10, 01:17:52
@sjh7132 Thanks for the reply. By one-way shielding, I mean like this example, where one pole is so occluded that its effect is negligible. If opposite poles continue repulsing rotor magnets around in a circle, what would cause the rotor to stop, besides applying a load? Unlike a pendulum, I don't see the potential energy well to dig ourselves into - do you see one? video number rjr94ha7W8w

@ssheetz78 The ...
By: sjh7132. on 25 Aug 10, 20:18:38
@ssheetz78 The Perendev is an obvious fake. You never see the backside (Where I'm sure they are powering it with a drill or motor.) Then there is a break in the filming before they go to show that side. A man in the background completely disappears.

@ssheetz78 I think ...
By: sjh7132. on 25 Aug 10, 20:17:14
@ssheetz78 I think with careful measurements all the energy is always accounted for. A good bearing doesn't eat much energy. There is no such thing as one way shielding at least that would be useful for a magnet motor. You can distort the field lines but you always get equal attraction or repulsion coming and going. I have looked at other examples. Most things like the Bendi motor involve people making bad measurements of pulsed power.

Thanks for ...
By: ssheetz78. on 25 Aug 10, 20:11:44
Thanks for describing classic physics but I don't know about your conclusion. When you lift the tinkertoy pendulum, you provide the energy that will go back and forth from potential to kinetic. But there are motors that continue spinning long after the energy of the (small) initial push _should_ have been lost to friction. Also, the demo you debunk here has just metal plates as stators - have you seen the ones with magnets which are one-way shielded?

Thanks for ...
By: ssheetz78. on 25 Aug 10, 20:09:50
Thanks for describing classic physics but I don't know about your conclusion. When you lift the tinkertoy pendulum, you provide the energy that will go back and forth from potential to kinetic. But there are motors that continue spinning long after the energy of the (small) initial push _should_ have been lost to friction. Also, the demo you debunk here has just metal plates as stators - have you seen the ones with magnets which are one-way shielded? Have you seen a Bedini or Perendev motor?

I loved it :D
By: HeavyDemir. on 21 Aug 10, 22:37:59
I loved it :D

@hopeforthelonghaul ...
By: sjh7132. on 01 Jul 10, 13:01:49
@hopeforthelonghaul Besides, haven't you seen what happens when someone builds one of these things and it doesn't work????? A bunch of people will say things like "You need to reduce that magnet spacing" or "The angle to between this and that needs to change', etc. It's much better to work at the conceptual level and show it doesn't have a chance of working with any tweaks.

@hopeforthelonghaul ...
By: sjh7132. on 01 Jul 10, 12:57:52
@hopeforthelonghaul I don't need to build it. I modeled it with classic physics. I proved the model was valid by showing it predicts exactly what he shows. Then I use the same model to show that the complete machine doesn't work... You'll notice that he never completed his machine and his videos on this machine are now gone. Gee I wonder why....

Did you actually ...
By: hopeforthelonghaul. on 01 Jul 10, 12:37:43
Did you actually build a model to disprove Mr. Roney's hypothesis, or are you just negatively criticizing his work without actually putting his theories to the test? Calculations and graphs are pretty, but even calculations have been wrong and needed adjustments. Build it, then record the failed experiment, then you will have gained credibility. I'm just saying....

@lightbulbsocket ...
By: sjh7132. on 02 May 10, 23:27:50
@lightbulbsocket The problem is that most don't show as much detail and as complete a run (unedited) as James did.

I agree completely ...
By: lightbulbsocket. on 28 Apr 10, 23:31:26
I agree completely with your analysis of Mr. Roney's design 100%. I would have liked to see you pick a design that actually looks like it has half a chance at working to begin with though.

Really informative
By: anariaq. on 23 Apr 10, 23:26:43
Really informative

Great Vid. It's ...
By: valveman12. on 16 Feb 10, 01:29:01
Great Vid. It's too bad that no matter how many times you explain this to people, there are still many who think you can make a motor with just magnets. It can't be done since magnets always reach equilibrium just like a relaxed spring.

Ok, i guess a ...
By: trailkeeper. on 31 Jan 10, 19:48:50
Ok, i guess a magnet can be brought closer to another magnet and be repelled, even after being held there for a long time, just like a spring or slingshot can be stretched to store energy,and then released to like shoot an arrow or something. But with the magnets, it seems more due to an imbalance of forces (N and S) rather than stored energy as with a spring. I know a spring can be stretched,and the spring "gains/stores energy", can a magnetic field sore energy or be increased?

Sure that's exactly ...
By: sjh7132. on 31 Jan 10, 19:23:53
Sure that's exactly what magnets do, and pretty much the only thing they do. When you pull two magnets apart, it takes energy to do it, just like stretching a spring. Then when you let go it they snap back, just like the spring.

@sjh7132 Yes, a ...
By: trailkeeper. on 31 Jan 10, 16:19:53
@sjh7132 Yes, a magnet can cause a force due to its magnetic (force) field, like the forces of a sping, but I'm not yet sure if it can store any energy like a spring though.

in the you tube ...
By: manwar999. on 31 Jan 10, 01:33:48
in the you tube james roney video (James Roney Stators, Contoured Runway Plates) the one your commenting on, that is 10:04 minutes long...at 08:00 to 08:05 minutes...very few know that distance sometimes changes field polarity...now you know...

That is correct. ...
By: sjh7132. on 30 Jan 10, 23:44:57
That is correct. You can think of a magnet as just a different kind of spring or rubber band.

So then, I guess a ...
By: trailkeeper. on 30 Jan 10, 19:51:21
So then, I guess a magnet isn't a fundamental source of clean energy.

Yes, that's how I ...
By: sjh7132. on 29 Jan 10, 17:02:31
Yes, that's how I ended up in this subject area too.

I'm not sure about ...
By: sjh7132. on 29 Jan 10, 17:01:08
I'm not sure about your time indexes since the video is only 7:35 long. I don't believe he pushed it. The magnets are attracted to the plate so it wants to move. But it doesn't even come close to leaving the last plate.

between 08:00 and ...
By: manwar999. on 29 Jan 10, 06:53:40
between 08:00 and 08:05 time minutes the flywheel is repelled from entering the gate...he has to push it into the gate thus imparting energy into the system, in order for his system to free wheel it must enter into the gate by itself and exit by itself from all distances relative to operation...one must overcome the or that system wont work...

That's true, but ...
By: sjh7132. on 19 Jan 10, 18:47:08
That's true, but lets take the example of a wind turbine. If it takes 10 kwh to make a turbine, but the turbine will produce 1000 kwh in it's life, you are ahead. Ideally power from the first turbine could be used to make 100 more.

Analysis of a Magnet Motor Part 2
Posted by: sjh7132

Video duration: 601 seconds

This is an in depth analysis of a magnet motor experiment by James Roney. I construct a model for the system using classical physics and try to show that nothing extraordinary is happening.

Related: science, physics, magnet, motor, free, energy, potential, kinetic, freemagneticenergy

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@deepcut71 No, ...
By: sjh7132. on 08 May 10, 02:11:34
@deepcut71 No, inertia would be part of Kinetic energy. The inertia basically determines how much speed you get in exchange for your potential energy.

Does your PE graph ...
By: deepcut71. on 08 May 10, 01:04:13
Does your PE graph account for inertia ?

(more 2) The logic ...
By: knowledgemonger. on 29 Nov 09, 17:28:27
(more 2) The logic that did the timing of holding the MOSFETs on was just a comparator watching the 24V on the 10,000uF. When it drooped down to about 10V I snapped the gates low. The state of charge checking logic was only powered when the turbine was running. It was just a comparator that go a combined reference + diode drop correction + a temperature correction and compared that to the sensed battery voltage. The MOSFETs were only sunk to the mass of the case. No fins were really needed

(more #1) This ...
By: knowledgemonger. on 29 Nov 09, 17:16:05
(more #1) This brought the rotor to nearly a stop without a jolt. I sensed the battery voltage through the rectifier. A second semiconductor strapped to the rectifier gave me a temperature corrected voltage matching the diodes drop. The generator also charged 10,000uF of capacitors. This is what powered the circuit. Every few minutes, the MOSFETs were switched off. The turbine spun up and I got a read on the state of the battery and recharged the capacitors.

Wind power is ...
By: knowledgemonger. on 29 Nov 09, 17:11:57
Wind power is certainly worth a look. The cubed relation between wind speed and power is a bit ugly. I will explain a winf powered battery charger I did: A 90V DC motor was the generator. It charged a 24V battery through a large rectifier. Since the drag of a stalled rotor is a lot less than a freewheeling one, I brought the rotor to nearly a stop by putting a short on the motor when the battery was charged. The short was applied smoothly by slowly turning on the power MOSFETs (more)

Thanks for the ...
By: sjh7132. on 29 Nov 09, 00:19:30
Thanks for the backup knowledgemonger, but emagnets is just giving me grief because most of my video work is in the wind turbine area where it's possible to make real power. And things spin for more than a single revolution. :-)

@knowledgemonger ...
By: emagnets. on 29 Nov 09, 00:00:05
@knowledgemonger dude relax, He knows me well, i am just teasing him..all is is good ... regards

The maker of this ...
By: knowledgemonger. on 28 Nov 09, 22:55:15
The maker of this video decided to test an idea using basic logic and well known physics. He explanation of the situation is correct.

wow SJH, you have ...
By: emagnets. on 28 Nov 09, 21:41:36
wow SJH, you have moved on to the dark side! we miss you on the windy side. later.

I can believe that ...
By: sjh7132. on 25 Nov 09, 16:43:49
I can believe that would be the case, but how does that help you. When you bring the magnets together first you fight the repulsion, then get attraction that helps you. Then when you take them apart you fight that same attraction, but then get the free repulsion. You get back only what you put in. Hiding the repulsion with the attraction of metal doesn't make it go away. It reduced the attraction of the metal and you pay the price that way.

No matter what you ...
By: knowledgemonger. on 25 Nov 09, 14:32:29
No matter what you do, the average torque will always come out to zero. So long as the force between two magnetic poles only varies with the current positions and does not depend on the history, the torque must always average to zero.

You simply make ...
By: FreeMagneticEnergy. on 25 Nov 09, 05:17:09
You simply make sure that the distance between the armature magnet and the stator are close enough where the attraction of the armature magnet to the steel plate is stronger than the repelling force of the like pole stuck to the other side of the steel plate. As the armature magnets move away from the stator after passing the direct line of field at the six o`clock position, the gap between the two like poles starts to increase, causing the two poles to thrust away from each other. Try it.

Just grab two 1" ...
By: FreeMagneticEnergy. on 25 Nov 09, 05:04:14
Just grab two 1" square magnets by 1/4" thick and simply stick one of them to the back of a piece of steel that's 1/8" thick that's no less than 2" square. While holding the steel plate with the magnet stuck to it, grab the other magnet and slowly bring the same pole towards the steel plate. At first the two magnets will repel each other. However as the 2nd magnet gets closer to the steel, the attraction to the steel plate begins to take over. Try it, don't wait on me to show you.

I will have to see ...
By: sjh7132. on 25 Nov 09, 03:08:37
I will have to see this to believe it because I think if you are going to provide a push as it leaves, then you have to push it to the point to begin with. It's just another little hump in the graph.

"Another way to ...
By: FreeMagneticEnergy. on 25 Nov 09, 02:55:11
"Another way to think of it, is if you canceled out the last magnet, or the last piece of stator, then the second to last one essentially becomes the last one and the problem is still there." Every magnet in my model would be treated the same. Thus it makes no difference what number in line the magnet is. No counter pull is just that. In fact as each and every magnet passes the stator it will be given a swift kick in the ass just as it leaves the stator.

About throwing the ...
By: Drdump1. on 24 Nov 09, 17:49:54
About throwing the touqe force passing out up the mountain this remind me of video Tape Heat ve a Pendulum cut out Slot that's make the Tape Head ve a Trowing force to spin faster n freely. This Tape Head ve to b install in around 15Deg angle...Mayb u should try this method combine with yours thanks

LIke I said, you ...
By: sjh7132. on 24 Nov 09, 15:42:42
LIke I said, you can add a magnet here or there, but it will only put a little dent or hump in the potential energy graph. You still have to go up a mountain. Another way to think of it, is if you canceled out the last magnet, or the last piece of stator, then the second to last one essentially becomes the last one and the problem is still there. But I'm open to my model being wrong. Show an experiment that the model predicts incorrectly and I'll have to trash or modify the model.

The average torque ...
By: knowledgemonger. on 24 Nov 09, 14:33:18
The average torque over one full rotation of the machine will still be zero. Each magnetic pole pair produces a torque vs angle curve. All of the curves have an average value of zero. When you add another magnet, you add a bunch of new curves but all of these new curves also have an average of zero. Adding more and more magnets makes the situation more complex but brins you no closer to a device that produces a non zero average torque.

However, as the ...
By: FreeMagneticEnergy. on 24 Nov 09, 10:20:32
However, as the armature magnet moves by the direct line of force at the 6 O`clock position over to the 6:30 position, the gap of armature magnet begins to increase quickly, and thus the like poles once again begin pushing away from each other. Since the armature magnet at the 6:30 position is no longer parallel with the stator magnet, it will cause sudden thrusts as it passes the stator of a like field. I make a video ASAP as I'm on vacation.

There is a point ...
By: FreeMagneticEnergy. on 24 Nov 09, 10:03:30
There is a point where the free floating magnet gets so close to the steel plate that it is no longer being repelled by the like force stuck to the other side of the steel plate. This is what I call the sweet spot where there is no pulling or pushing going on between like poles. Reason being is because the armature magnet is equally drawn to the steel plate as much as the magnet behind the steel plate is applying a repelling force.

There is an ...
By: FreeMagneticEnergy. on 24 Nov 09, 09:55:46
There is an equation that is not offered here because I did not make the additional information available before this video of my work was made, of which was done with my permission. Simply stated, I have found a simply way to zero out the counter pull on the last magnet out. This is achieved by finding the natural spot between 2 like poles with a steel plate plate between them, with one of the two magnets stuck directly on the steel plate.

Yes, I picked the ...
By: sjh7132. on 19 Nov 09, 02:48:04
Yes, I picked the energy method because everything was attracting,and it seemed to simplify things. (No vectors, no figuring tangential components, etc.)

I tend to do the ...
By: knowledgemonger. on 19 Nov 09, 01:50:25
I tend to do the math in terms of torque instead of energy. Your method seems to be just as good. the only difference is your curve is the integral of mine.

ok, i will cheers
By: X00000013. on 14 Nov 09, 20:54:35
ok, i will cheers

You want me to ...
By: sjh7132. on 14 Nov 09, 03:49:21
You want me to spend $100.00 in magnets to build a machine to prove it doesn't work just like I say it won't? James has already done that for me. Magnet motors are a lost cause, if you want to see some semi-productive work, then check out my wind turbine videos.

Analysis of a Magnet Motor Part 1
Posted by: sjh7132

Video duration: 476 seconds

This is part 1 of three of an indepth analysis of a magnet motor experiment by James Roney. Part 1 is a basic lesson on Potential and Kinetic Energy.

Related: science, energy, james, roney, magnet, motor, potential, kinetic, physics, freemagneticenergy

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Lenz2 Blade Simulation
Posted by: sjh7132

Video duration: 274 seconds

This is an OpenFOAM simulation of a Lenz2 blade. The solver is IcoDyMFoam. The blade is 18" from the center and is rotating at 60 RPM. The wind is 15 MPH (6.7 m/s). The torques shown are for a 1.0 cm long blade. So multiply by 100 for a meter long blade.

Related: cfd, openfoam, lenz2, wind, turbine, science, simulation

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Latest comments made on this video:

@HeavyDemir This ...
By: sjh7132. on 21 Aug 10, 22:07:06
@HeavyDemir This was when I was just learning now to simulate. I'm much better at it now. :-)

Dam cool stuff, ...
By: HeavyDemir. on 21 Aug 10, 22:03:38
Dam cool stuff, keep it coming

Awesome job! I ...
By: Keveeee2000. on 06 Mar 10, 17:16:01
Awesome job! I have been working on a modified version of the Lenz 2. It would be interesting to see how it would work in this sim.

This is really ...
By: FreeMagneticEnergy. on 23 Oct 09, 15:53:59
This is really awesome. The vertex data starting at 1:38 reminds me of the formation of hurricanes.

The normal lenz2 ...
By: sjh7132. on 18 Sep 09, 18:08:46
The normal lenz2 turbine uses 3 blades and that helps balance the torque all the way around.

You have to use the ...
By: sjh7132. on 03 Sep 09, 02:25:58
You have to use the Openfoam-1.5-dev version (maybe 1.6 now). The interface to the moving grid is called GGI (general grid interface, I think). A search on those terms might get you something.

This is great! The ...
By: LinuxRex2. on 03 Sep 09, 01:17:56
This is great! The vertex based data looks much better now. BTW, how do you move your mesh in OpenFoam? How do you define the interface region between the static portion of your mesh with the moving circular mesh? Do you have any kind link you could post that shows us how to move the mesh? Cheers!

I can see in the ...
By: trailkeeper. on 02 Sep 09, 12:27:09
I can see in the graph, and taking the top of the vid area as 0 degrees, that torque is low or negative in fact (I guess this would be drag then) at 0 degrees, and then it's a bit low at 180 degrees.A very high peak at 90 degrees, and a fairly high peak at 270 degrees.Having two peaks is a good, hence that blade design is good. I guessing that things for the turbine system will change if another blade is introduced at 180 degrees - perhaps to add some torque into the system for when it was low?

That is fantastic!
By: Caleb6543. on 02 Sep 09, 12:16:06
That is fantastic!

Flat plate in the Wind
Posted by: sjh7132

Video duration: 421 seconds

An OpenFOAM simulation of a 25cm x 1m plate being rotated at 6.7m/s (15 mph) in a 6.7 m/s wind. The radius of rotation (to the center of the plate) is 24 inches.

Related: cfd openfoam

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Latest comments made on this video:

@sjh7132 Thanks. ...
By: anariaq. on 24 Apr 10, 00:22:00
@sjh7132 Thanks. will look into it. Don't mind if I can ask later about things?

@anariaq I have ...
By: sjh7132. on 24 Apr 10, 00:15:07
@anariaq I have not used 1.6 yet because it won't handle the rotating meshes. Openfoam comes with a bunch of examples, one of them is a 2d simulation of a wing shape. To answer your question on speed. The rotating turbines simulate at about 20ms per hour (varies according to mesh complexity.) The 3d ones take much longer. However since you are really simulating a stationary wing, you can probably get good results in a few hours.

@sjh7132 Hmm I can ...
By: anariaq. on 24 Apr 10, 00:11:31
@sjh7132 Hmm I can get 1.6 My interest is airplane ;) but think a 3D calculation take time? Will get to work on installing it

@anariaq If you ...
By: sjh7132. on 23 Apr 10, 23:56:29
@anariaq If you can download Openfoam-1.5-dev and get it installed, I can send you an example tarfile of a case that does the lenz2. I'm putting together a web page of some example cases.

Hey how hard is it ...
By: anariaq. on 23 Apr 10, 23:53:23
Hey how hard is it to get into how to use this program? and how long dos it take to compute?

Ahh you are there, ...
By: johnjejo. on 06 Apr 10, 22:26:54
Ahh you are there, great. Ok, the first low torque position is where the wind is flowing (most) smoothly past the plate. Just like in sailing. In sailing the most optimum position for a sail is at 45 degrees to the wind ie. sailing across the wind. The second place you note is the same but the wind is not flowing past the plate smoothly. I'd like to see a yacht sail shape e.g. Rounded nose, long trailing flat but with some belly. The shape is designed to embrace the eddies that spin off.

@johnjejo Yes, the ...
By: sjh7132. on 06 Apr 10, 22:23:02
@johnjejo Yes, the plate moves at a fixed rate, and the force of the air on the plate is measured.

??? How does the ...
By: johnjejo. on 06 Apr 10, 22:17:48
??? How does the plate move against the wind? Are you powering the plate around? Do you sail (yachts) by the way?

I use Pinnacle ...
By: sjh7132. on 01 Jan 10, 16:53:40
I use Pinnacle studio 8+ and apparently it can't render in HD. :-(

Upload in Full HD! ...
By: MrNightLifeLover. on 26 Nov 09, 10:22:12
Upload in Full HD! ;)

Yet another HAWT
Posted by: sjh7132

Video duration: 295 seconds

Information about yet another one of my wind experiments. This is a 7ft dia HAWT. Goals were to make it very discrete and make it tougher than my last one. Efficiency is fairly low and hasn't been measured carefully. I estimate its output to be 40-50W (mechanical energy) which makes it about 15-20% efficient.

Related: hawt, wind, turbine, science, free, energy, pvc, blades, mill, neighborhood

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Latest comments made on this video:

@Shalek That can ...
By: sjh7132. on 20 May 10, 05:20:24
@Shalek That can be done, but it's not as good as just having longer blades. Plus that funnel would have to change it's position according to the wind direction.

Hello it's me again ...
By: Shalek. on 20 May 10, 00:56:52
Hello it's me again, I've grown rather curious about something lately. Could one use a funnel of sorts to be able to reduce the size of the blades required and/or to obtain a greater yield from the turbine?

@Shalek A house ...
By: sjh7132. on 14 May 10, 15:11:34
@Shalek A house uses about 1000 watts. This turbine made maybe 50 watts in a good wind. So about 20 turbines. I think I can do better.

Silly question, ...
By: Shalek. on 12 May 10, 11:33:20
Silly question, about how many of those would you need to power your house? Is it fiseable and practical?

Hello, nice work ...
By: MatthewAT385. on 16 Aug 09, 14:22:47
Hello, nice work youve done. Its really nice to see someone so amused with building something, in this case wind harvester =) Oh precious feel, when you see it works Good luck, Matthew

I think so, but the ...
By: sjh7132. on 16 May 09, 22:57:30
I think so, but the widest your blade could be is 1" at the middle and it's going to get narrower from there. At some point the PVC is thicker than the blade is wide and that part of the blade doesn't do much good. Try it and see. I'm sure it will spin. Then make a video and show me how it works. :-)

great wind turbine ...
By: DeanC993. on 16 May 09, 22:52:32
great wind turbine you are super at this

i have a 2" dia PVC ...
By: BeefyCrackers12. on 16 May 09, 18:01:04
i have a 2" dia PVC.. would that be okay for a smaller 4 - 4.5' dia turbine?

For a 12" hub the ...
By: sjh7132. on 16 May 09, 06:23:48
For a 12" hub the measurements around the outside of the 3.5" dia PVC were: at the hub edge 3.0" 1ft from the hub 1.8" 2ft from the hub 1.3" 3ft from the hub 1" At the hub you need to widen it out so you can put screw holes through what would be 0 inches. I think to be more efficient, the blades have to be cut to be a little faster (thinner).

damn that is a very ...
By: BeefyCrackers12. on 16 May 09, 05:28:16
damn that is a very nice turbine u got there.. i just baught a long 10 foot peice of pvc and im going to cut some blades.. what were the measurments and all on ur blades? thanks 5*s

awesome video very ...
By: michael970. on 15 May 09, 23:00:50
awesome video very nice job on turbine great blades pretty soon your neighbors will have you building them some turbines I hope.keep us updated

Testing My Wind Turbine (HAWT)
Posted by: sjh7132

Video duration: 218 seconds

Testing of a small wind turbine with PVC blades and a home made alternator. The blades are cut from 3" PVC and are 1ft long plus 4 inches to mount it to the hub. The alternator uses 12 magnets and 9 coils, 3 coils on each phase.

Related: wind, hawt, science, power, free, energy, mill, turbine, failure, stress

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Latest comments made on this video:

@Zypkin TRUE THREU ...
By: muddymuddymuddmann. on 07 Jul 10, 09:38:47
@Zypkin TRUE THREU AND TRUE. AND SOLAR FILLS THE GAPS IN THE WIND VERY WELL. WIND OR SOLAR ARE ONLY PART TIME GIGS. MUDDy

@muddymuddymuddmann ...
By: Zypkin. on 05 Jul 10, 04:56:36
@muddymuddymuddmann ...I think U just got to the point :) 5 days of wind at 35mph with a 1.5kW generator make up for a 365days of production with Ur small scale 9mph generator... plus you have much less working hours this longer lifetime. And that's all... you have to use the wind when and where there is wind... otherwise you go solar :) Or course one has to find a compromise, but I believe it's worth to keep in mind that higher power comes with higher winds.

@Zypkin ACTUALLY I ...
By: muddymuddymuddmann. on 05 Jul 10, 01:15:12
@Zypkin ACTUALLY I THINK INDUSTRY DOESNT CARE ABOUT THE INEFFICIENCIES AS COMPARED TO THE COST OF THE EXTRA MAGNETS. AND THE LOW WIND STARTUP AND LOW RPMs OF THE AXIAL FLUX'S ABILITY. IF THEY DID, THEY WOULDNT MAKE A SMALL 4 FOOT PROP AND RATE IT AT 1.5 KW. IT TAKES ABOUT 35 MPH WINDS TO GET THERE. WE DONT HAVE MANY DAYS OF THAT PER YEAR. WHEN THE WIND SPEED IS CUT IN HALF THE POWER OUT IS CUT BY 8 TIMES. 9 MPH IS 1/64th THE POWER. 23 WATTS. AND IT COST THE CONSUMER HOW MUCH? MUDDy

@muddymuddymuddmann ...
By: Zypkin. on 04 Jul 10, 17:43:11
@muddymuddymuddmann ...I invite you to do a few tests and see the difference between an iron core and a dual rotor air core :) ...dont U think that if axial flux air core is so effective we'd be producing energy that way instead bothering with tons of iron in our MW generators?

@Zypkin Hey friend, ...
By: muddymuddymuddmann. on 02 Jul 10, 13:51:03
@Zypkin Hey friend, It is a common statement. The difference of the dual magnet rotor axial flux PMA is. There are 2 magnet rotors that are of opposite poles. So the magnetic flux travels from the back of one magnet to the one next to it. This makes each magnet 2 x stronger in flux current. The other rotor does the same thing but in opposite polarity. thus the flux is directed through the coils instead of to the magnet beside it. That is why they need no ferrous metal in the coils. full circle.

@muddymuddymuddmann ...
By: Zypkin. on 02 Jul 10, 08:19:54
@muddymuddymuddmann ...this is a common statement but it's totally wrong! No iron in the machine means a lot less field in the coils (100-1000 times less!!!) which means that to get the same voltage you have to use a lot of copper (turns in coils), therefore the impedance (resistance) of Ur machine will be much higher and the internal losses will be huge compared to those of the same machine with iron cores....... ...think abt it :)

@Zypkin ...actually ...
By: Zypkin. on 02 Jul 10, 08:16:15
@Zypkin ...actually like this I'm really surprised that it works at all! By using a counterplate you'd be able to increase the magnetic fiels inside the coils by a big deal... probably more than 50%... which means you could reduce by the same amount the number of turns in each coil and consequantly the overal resistance of the generator (read cut the losses by a lot)... ...more on this on reuqest :)

hey... you should ...
By: Zypkin. on 01 Jul 10, 20:39:11
hey... you should use an iron counterplate on Ur generator... if U really use one disk as U show in the video U have an open magnetic circuit... not much efficiency :(

Are you asking ...
By: sjh7132. on 13 Jan 10, 15:18:15
Are you asking about the music or song? I use Pinnacle Studio 8 for editing my videos and the song was something that came with the software.

which sound was ...
By: Yaaroslav. on 13 Jan 10, 10:52:16
which sound was placed on your video?

Its still a great ...
By: muddymuddymuddmann. on 24 Dec 09, 05:47:58
Its still a great machine. Axial flux alternators are the best. because they have no ferrous stator material in the coils. that means there are no eddy currents, and no lens effect except in the coils them selves. Free spin until they meet the charging voltage. no waste. MUDDy

Thanks Mud. The ...
By: sjh7132. on 23 Dec 09, 15:35:18
Thanks Mud. The blade did get improved in a later video. The magnets are backed by steel, but there isn't a second layer of magnets behind the coils and that hurts the power.

One solid piece ...
By: muddymuddymuddmann. on 23 Dec 09, 06:42:52
One solid piece blade would be good. I noticed the narrow spots are where the blades broke. I love the stator. the rotor would deliver 4 times the power with a steel backing to channel the magnetic flux. Sorry if i missed anything the speakers are out on this puter. This is definitely 5 stars. The tail was the best use of an old advertisement political sign ever. Who complained about the wind turbine the most?, the DEMs or the REPs MUDDy

e menomale che sci ...
By: chissD. on 16 Oct 09, 22:40:40
e menomale che sci ingegnere'? della muino bianco ?

You should win an ...
By: embeddedprogrammer. on 04 May 09, 14:44:51
You should win an award for "best use for a campaign sign"

I came to the same ...
By: sjh7132. on 21 Apr 09, 20:12:16
I came to the same conclusion. My next one will be at least twice as big. I will also make sure I keep it under load.

You can get some ...
By: Caleb6543. on 21 Apr 09, 20:03:31
You can get some high stresses with a small diameter turbine because the rpms have to be very high to get a good tip speed compared to the wind speed. And centrifugal acceleration goes up with the square of the rpm.

Seems reasonable to ...
By: trailkeeper. on 16 Apr 09, 18:15:20
Seems reasonable to take that part out of the equation since theres no power there to include into the efficiency. I guess your calculation is for the available power to the windblades as being the collectors of the wind available to them only. I seen some people use (pi r^2), but I guess that's the theoretical wind power to everything including the hub, but I guess now its not fair to include that into the specific efficiency of the windblades, hence it's a better value to use.

I used PI r^2 - PI ...
By: sjh7132. on 16 Apr 09, 14:23:07
I used PI r^2 - PI R^2 Where r is the total radius ,and R is the radius of the hub. (I figured the hub didn't really make any power.)

Did you calculate ...
By: trailkeeper. on 16 Apr 09, 09:07:33
Did you calculate the swept area using the formula for the area of a circle (pi r^2)?

I don't think so. ...
By: sjh7132. on 15 Apr 09, 15:15:49
I don't think so. I think fiberglass resin is a one way chemical reaction. I can always make a new stator though.

you should ue a ...
By: DeanC993. on 15 Apr 09, 11:57:16
you should ue a furling systym good luck

Is it possible to ...
By: trailkeeper. on 15 Apr 09, 05:44:22
Is it possible to soften the alternator a bit in an oven and press it level again?

LOL, yes, that's ...
By: sjh7132. on 15 Apr 09, 04:52:48
LOL, yes, that's the plan but first I need to make some electronics to control it.

well you can always ...
By: DeanC993. on 15 Apr 09, 00:49:57
well you can always make a better one(:

Testing My Experimental Wind Turbine (VAWT)
Posted by: sjh7132

Video duration: 319 seconds

A video about my experimental wind turbine and the techniques I used to measure it's output. Video shows how to calculate expected output, and some of the basic equations used for doing this type of testing.
The VAWT is 2ft tall with a 16 inch diameter.

Related: vawt, wind, turbine, power, measurement, green, energy, free, science, electronics, current, voltage, calculations, physics

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Latest comments made on this video:

@HeavyDemir It's ...
By: sjh7132. on 21 Aug 10, 21:43:51
@HeavyDemir It's Height * Diameter

Umm the sweep area ...
By: HeavyDemir. on 21 Aug 10, 21:41:44
Umm the sweep area u talk of? Is it the hight * breadth of the blades, or the circle they scribe on the ground ?

@kaloresi333 That ...
By: sjh7132. on 21 Jul 10, 15:02:04
@kaloresi333 That equipment pays my bills because it's for my day job. :-)

Where did you find ...
By: kaloresi333. on 21 Jul 10, 10:59:18
Where did you find the money for all that equipment.If I had that i finished my project.good luck dude

@Zypkin You are ...
By: sjh7132. on 07 Jul 10, 18:25:07
@Zypkin You are correct. That alt will never produce any serious power. It was my first try, and I didn't run through the equations before I made it. Still is has been good enough to test all my small turbines so far. (I haven't had one that could overpower it.)

@sjh7132 ...46ohm ...
By: Zypkin. on 07 Jul 10, 18:21:47
@sjh7132 ...46ohm looks to me a huge number for a device supposed to make power (let's be clear, it's not Urs only... it's a common range for coreless axial flux machines I saw around). As a matter of fact commercial generators have internal impedance less than 1ohm... and that's because you have to get the power out of the machine and not waste it in heat :) Anyway, I'm just tyring to help... I'm working on a ferromagnetic core axial machine, I hope I'll post my results within the summer.

@sjh7132 ...right.. ...
By: Zypkin. on 07 Jul 10, 18:15:24
@sjh7132 ...right... but this wouldnt work because would also increase the thickness of the coil which, being coreless, would lose most of the magnetic field :)

@Zypkin Or use ...
By: sjh7132. on 07 Jul 10, 13:34:43
@Zypkin Or use more copper in terms of thicker wire.

@Zypkin I'll admit ...
By: sjh7132. on 07 Jul 10, 13:33:03
@Zypkin I'll admit the alternator is poor, but it was enough to bring the turbine to a crawl. I was only using one phase to test which was 46 ohms. Had the alt been the real problem, the turbine would have continued at nearly full speed. I was hoping to have to use all 3 phases to load the turbine, but it was so weak it wasn't necessary.

@Zypkin ...a good ...
By: Zypkin. on 07 Jul 10, 08:02:09
@Zypkin ...a good generator should blow the coils if you short it... meaning its own impedance shall be so low to generate lot of current. To get a low impedance you need to use less copper (less turns in your coils) but since you shall keep the voltage high you must definitely reduce the air-gap stator/rotor and improve the overall design of the generator :)))

Your power problem ...
By: Zypkin. on 07 Jul 10, 07:58:47
Your power problem is not in the turbine... it's in the generator! You are trying to get 20W out of a generator which resistance is 46ohm and spinning at 25V. Now, you dont specify which Tension and Impedance you measured (phase or line), however given that P=V^2/R if you short the generator (no load) you have 25*25/46 = 13.6W ...it's the best you can get: with no load... adding any load would just increase the overall impedance thus reducing the current and consequently the power.

youtube.com/watch?v ...
By: itsandbits1. on 14 Jun 10, 01:59:46
youtube.com/watch?v=EMtbMRp8aow take a look at this blade model

@Shalek That's ...
By: sjh7132. on 20 May 10, 05:23:45
@Shalek That's only a problem for pure drag type turbines, and in that case a ramp or series of ramps (so it handles all wind directions) helps. Most modern blades use lift and still drive forward on most of the upwind side. See my video about the lenz blade Simulation watch?v=Mk49ZgBTX5A

Hey I was thinking, ...
By: Shalek. on 20 May 10, 00:59:21
Hey I was thinking, I heard that a problem with vertical wind turbines is that, because wind hits both halves of the wind turbine it causes it to slow down. Couldn't one place a ramp to block half of the wind turbine and/or direct that half's wind to the other half? Just some thoughts. Thanks.

@sjh7132 I ...
By: johnjejo. on 06 Apr 10, 20:43:26
@sjh7132 I sincerely thank you for making this video because you went further than most people and went behind the spinning flashing lights and tried to apply it. It also echoes my own steps so it's nice to connect with you.

Yes, I was a little ...
By: sjh7132. on 19 Feb 10, 22:05:39
Yes, I was a little naive when I made this first video. :-) Although when I calculate efficiency of my turbines, I use % of the power in the wind, not of the Betz limit. So the highest I could ever see is 59%. Its a little misleading to calculate based on the Betz limit, isn't it? A good turbine is 30% efficient so 12 watts could be reasonable.

I hope you ...
By: Porterjebazillanator. on 19 Feb 10, 22:00:16
I hope you understand that the power equation is the power available in the wind, not the power you can produce. You need to add in Betz limit (16/27 or 0.5926) to find the max power you can actually achieve. So really, your turbine should be able to optimally produce around 25 watts. With efficiency factored in, 50% efficiency will lead to maybe 12 watts. Then there is inherent loss from the circuitry, so you are really looking at closer to 10 watts. Just so you know. Good video and nice idea.

Excellent Video. ...
By: dankazi. on 20 Jan 10, 19:21:32
Excellent Video. Thanks for all the tips... Time to start making mine own VAWT....

You are correct, a ...
By: sjh7132. on 17 Jan 10, 01:50:45
You are correct, a lower resistance would help, also being closer to the magnets (My stator is warped.) The 'prefect load' also depends on what the turbine can actually produce. If you pull too much current, then the turbine just stalls. One of my other videos shows the Alt I was using.

Greetings, thanks ...
By: awizardalso. on 17 Jan 10, 00:57:19
Greetings, thanks for going a little deeper than most. There's more to it than 'it produces 'x' number of volts'! If I remember correctly, the perfect load would be equal to the resistance of the alt coils for maximum power transfer. Are you using a homemade alt? To get better efficiency, I believe you need to lower the alt coil resistance. In any case, I appreciate your efforts here. I live in the city and limited to VAWT's and I'm just starting to seriously consider alternative power.

I used the full ...
By: sjh7132. on 15 Dec 09, 18:19:42
I used the full area (height * diameter) because this type of blade should create power all the way around. (except for directly into and with the wind)

Nice work. Real ...
By: planetdarwin. on 15 Dec 09, 18:17:32
Nice work. Real science and engineering. When you calculated the wind area of your turbine, did you estimate the entire cross-section of the turbine (height * diameter), or just the one half of it the wind is acting on (height * radius)?

Thanks, but I was ...
By: sjh7132. on 09 Dec 09, 16:11:08
Thanks, but I was hoping for 20 watts and only got 5. :-( Actually 20 was unreasonable to expect. You are also confusing watts and watt - hours. It's true I could build up a hundred watt hours in a day. But a 1KW heater will use that in 6 minutes.

Hey! Thanks for ...
By: Alvaround. on 09 Dec 09, 03:53:10
Hey! Thanks for the first half of your video The last half should not accept that 20 Watts is too low. Because you have 20 watts an hour. If the night is windy you can have 250 watts accumulated whit only one turbine. With 10 cheap turbines like yours, you can have 2500 watts accumulating by night. With that power you can heat a room for many hours. One hundred turbines for one home.

You might check out ...
By: sjh7132. on 08 Dec 09, 04:51:50
You might check out the Lenz2 blade. It's fairly simple and many people have good luck with it. My alt is one steel plate with magnets and coils on the other side. It's not very efficient and next time I'll go with magnets on both sides of the coils, even though its more dangerous to make.

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