Wind turbine Archimedes

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jam
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Wind turbine Archimedes




by jam » 28/05/14, 13:06

Hello everybody

I just saw this new model of wind turbine. What seems interesting is the low noise level and the efficiency: 80% of Betz

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http://phys.org/news/2014-05-dutch-comp ... bines.html
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by Grelinette » 28/05/14, 13:27

I like this new wind turbine well! :D

80% yield while Betz's law limits it to 60%! ... it seems unlikely, but it would be fun if this ancient Archimedes wind turbine was more, or at least as efficient, as all these ultra wind turbines - sophisticated which bloom everywhere!

Note also that the design of this wind turbine looks like Leonardo da Vinci propellers, and those I had tinkered with here on my insert: https://www.econologie.com/forums/post267303.html#267303
... and which have operated all winter long, just for the pleasure of seeing them spin! : Mrgreen:
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by moinsdewatt » 28/05/14, 13:35

Grelinette wrote:I like this new wind turbine well! :D

80% yield while Betz's law limits it to 60%! .......


Read more calmly.
He said 80% Betz, not 80% yield. : Idea:
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by jam » 28/05/14, 15:09

moinsdewatt wrote:
Grelinette wrote:I like this new wind turbine well! :D

80% yield while Betz's law limits it to 60%! .......


Read more calmly.
He said 80% Betz, not 80% yield. : Idea:


My theory is confirmed: bloggers cannot read!
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by Grelinette » 28/05/14, 21:54

Okay ... as soon as I saw the word "wind" followed by "80%", I took a shortcut!
But hey, why give a% of% rather than give the real%? ...

If I understood correctly, Betz's law limits the power recovered from the wind crossing the wind turbine to 60% maximum; 80% of 60% is therefore 48% maximum? ... and for a wind turbine that seems quite complex to achieve. Bof, I am disappointed : Cry:

I prefer to return to see my vertical wind turbines on my insert.
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by chatelot16 » 28/05/14, 22:00

it's stupid! it looks like the helicopter of vinci leonard ... leonard had excuses for not knowing anything about aerodynamics since it was a few centuries in advance ... but today this air corkscrew is without hope of preformance
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by Ahmed » 28/05/14, 22:23

But hey, why give a% of% rather than give the real%? ...

bah! It is like for condensing boilers: with this method, we arrive at more than 100% efficiency!
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by chatelot16 » 28/05/14, 22:36

it is misleading to take the betz limit for a yield: this 60% betz simply means that the wind does not blow in a pipe, and that the wind can bypass the windmill!

if the windmill lets too easily pass it does not recover any power

if the mill opposes too much wind resistance, all the wind bypasses

with just the optimum the windmill recovers the power determined by betz

the energy 1/2 mv ^ 2 does not exist: it is the kinetic energy of the quantity of air which passes but there is no means of recovering it ... it would be necessary to place in another dimension to slow down an air mass to a stop without disturbing around
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by jam » 29/05/14, 14:51

chatelot16 wrote:it's stupid! it looks like the helicopter of vinci leonard ... leonard had excuses for not knowing anything about aerodynamics since it was a few centuries in advance ... but today this air corkscrew is without hope of preformance


It turns however, and this without noise with an output of 48%. And coming from the country that has practically invented modern wind power, I believe in these characteristics.
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by Remundo » 29/05/14, 15:13

in any case, it is very pretty to watch turning.

I too am a little skeptical about the performance, but with no real argument to oppose, because aerodynamics is unpredictable.

One technical point, however: it is difficult to manufacture because the shapes are complex.
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