wind-turbine output?

[octavian]

Does anyone know how to estimate the wattage generated from 24.86 mph (or any other windspeed) windspeeds using a wells turbine?
I'm considering to build a wavegenerator setup and i've been playing with some figures.

i would be very happy if anyone could come with some input, especially from those of you that have a sound knowledge of maths...

[theremart]

Re Turbine..

I do not but here are some great web sites that can help you out.

http://gotwind.forumco.com/forum~FORUM_ID~2.asp

axialflux : Axial Flux Alternators

[octavian]

I do not but here are some great web sites that can help you out.

gotwind.org FORUM - Click here to post comments/questions - Powered by ForumCo.com - The Forum Company

axialflux : Axial Flux Alternators

thanks
but to all others... i would love further info

[muttdogg]

wind power

Hey Octavian
Don't know if this is helpful, or nor . To calculate horsepwer from a windmill, use _ (wind speed cubed)X(blade diameter squared)X .00478. I don't know how to get the cube or square sign up so I wrote it out. What type of blades are you using? I have had good success with the PVC design, on a small turbine. Now I am looking to design a simple wooden version, that does not involve carving, which seems to put off some, including me, and I am a carpenter. I saw at green power science someone who made a replicable set, but they want $30 for a CD on how-to. Not my idea of free energy. I think he uses a table saw to make a cove cut in the wood. I am getting ready to try the first one tomorrow.
Dan

[octavian]

Hey Octavian
Don't know if this is helpful, or nor . To calculate horsepwer from a windmill, use _ (wind speed cubed)X(blade diameter squared)X .00478. I don't know how to get the cube or square sign up so I wrote it out. What type of blades are you using? I have had good success with the PVC design, on a small turbine. Now I am looking to design a simple wooden version, that does not involve carving, which seems to put off some, including me, and I am a carpenter. I saw at green power science someone who made a replicable set, but they want $30 for a CD on how-to. Not my idea of free energy. I think he uses a table saw to make a cove cut in the wood. I am getting ready to try the first one tomorrow.
Dan

Thanks Dan,
as i said, it's just a consept at this moment and i'm just playing with some possible designs, dimensions and wave heights.

[octavian]

wing diameter

one more thing Dan,
when you say wing diameter... what do you mean? is it the distance between the tips of two opposite wings or is it something else?

[muttdogg]

Wings

Hey Octavian:
I'm talking about the diameter between the tips. not the size of the rotors themselves. I looked up the Wells turbine, and looked to me that it isn't the same as the wind turbine I am working on. But the horsepower ratio should at least get you started. What is you application? And, are you trying to generate force, or electricity?
Also the thickness of the rotor comes in to play, if you are using water, or any other medium to push the rotors. As an example,steam would easily push a rotor with very thin blades, extracting large amounts of energy from the steam, but you would have to produce the steam from another source of energy. Water and wind contain their own energy, but the methods of extracting that energy are inefficient. SO FAR. I think wind energy is around 57%, water about 45%. So the rotors, (blades) need to be larger, and thicker to capture enough energy to be efficient to warrant their cost and expense.
Never be discouraged, that your idea isn't discussed on this, or any forum. Never give up, because if you can think of it, it is possible. And, finally do not feel you are a failure because all you made is sawdust, fried transistors, metal filings: all here have made the same. That is the measure you will hold yourself to. We are all a sum of our failures and successes.
Excuse me if I went on too long.
Dan

[octavian]

Hey Octavian:
I'm talking about the diameter between the tips. not the size of the rotors themselves. I looked up the Wells turbine, and looked to me that it isn't the same as the wind turbine I am working on. But the horsepower ratio should at least get you started. What is you application? And, are you trying to generate force, or electricity?
Also the thickness of the rotor comes in to play, if you are using water, or any other medium to push the rotors. As an example,steam would easily push a rotor with very thin blades, extracting large amounts of energy from the steam, but you would have to produce the steam from another source of energy. Water and wind contain their own energy, but the methods of extracting that energy are inefficient. SO FAR. I think wind energy is around 57%, water about 45%. So the rotors, (blades) need to be larger, and thicker to capture enough energy to be efficient to warrant their cost and expense.
Never be discouraged, that your idea isn't discussed on this, or any forum. Never give up, because if you can think of it, it is possible. And, finally do not feel you are a failure because all you made is sawdust, fried transistors, metal filings: all here have made the same. That is the measure you will hold yourself to. We are all a sum of our failures and successes.
Excuse me if I went on too long.
Dan

Hi Dan,
what i'm talking about is really the easiest type of generator you could imagine, it uses the pneumatic motion of the waves to push air up and down a cylinder, this then generates the wind that will drive the turbine. the reason such a device would need a wells turbine is that the flow of air turns when the wave goes by and the amount of water in the cylinder goes down. this will then give electricity.
it's not a wind turbine per se but the medium that comes in contact with the blades is wind.
Thanks for the inspiring words there at the end, and no it was not too long

[octavian]

This was a reply for the same question on some other forum:

"power in wind = ½ * air density * swept area * wind velocity3

Air is about 1.23kg/cubic metre, water is 1000kg/cubic metre

Not sure exactly how a wells turbine works .. but for a rough idea:

In air with 1 square metre of swept area and 10mph;
10mph = approx 4.5 m/s
0.5*1.23*1*4.5^3 = 56w - then you have betz efficiencies etc ..

In water with 1 square metre of swept area and 10mph;
10mph = approx 4.5 m/s
0.5*1000*1*4.5^3 = 45562w or over 45kw"

I believe this may answer my question..roughly

[muttdogg]

wells turbine

Hey Octavian,
What or where are you going to use the generator? Most of what I've read about the Wells turbine is about waves, as in oceans. Still don't understand oscillating water columns, but I hadn't heard of it until you brought it up. You probably should start a new post named Wells turbine. Good luck withyour project!
Dan

[octavian]

Hey Octavian,
What or where are you going to use the generator? Most of what I've read about the Wells turbine is about waves, as in oceans. Still don't understand oscillating water columns, but I hadn't heard of it until you brought it up. You probably should start a new post named Wells turbine. Good luck withyour project!
Dan

i have started a new thread as you suggested. i hope it explaines the OWC concept well enough. this really isn't new technology... they started research on it in the 80's but it havn't recieved much atention although some atempts have been made to connect such a device to the electrical grid.