Wind turbine and windy: flag or brake?

[Grelinette]

Hello,

I come back to the theme of wind turbines. What do you recommend to protect my wind turbine in strong winds: feathering or rotor braking?

- In the first case, it is slow to see that as soon as there is a great wind energy potential we are forced to stop everything!
- In the second case, if the wind is very violent, do the current materials withstand the constraints and is the extra manufacturing cost interesting?

If not, would anyone have plans for a simple feathering system in strong winds, and also braking the rotor. I found nothing on the net. (Besides, why not the 2 systems acting in addition: first braking then feathering?)

One last question that comes to me when asking these questions: can progressive feathering of each blade be a solution? The angle of attack of each blade decreases with the force of the wind, a simple mechanical system should be easy to design and would allow to always recover energy and regulate the speed of rotation.

Quickly, I run to the INPI to deposit this idea!

ps: for Sunday DIYers here is a fun little DIY to do with children (that's all recycling): http://grelinette.free.fr/Eoliennefuturiste.MOV

(I put this link because I did not manage to download the video directly by the site which does not want to hear about MOV files!)

[Grelinette]

I would just avoid this kind of problem:
http://chezluc.blogspot.com/2008/03/un- ... emark.html

[Christophe]

For the videos, if you want you can add them to the EconoTV: http://www.dailymotion.com/group/econologie

It will be easier to visualize!

Well, I'm going to put a note on the file hoster above!

For the rest, the gigantism of wind turbines has little future.

Their development is linked, like the PV, to subsidy policies ...

But for wind power it is even worse than for PV, which remains at least accessible to individuals ...

[Grelinette]

ok thanks for the links for the videos ....
but flag or brake for my wind turbine?

[Gregconstruct]

I think it depends on how your wind turbine is studied but whatever happens there will always be a time when you will have no choice but to feather.

[loop]

Bonsoir

but flag or brake for my wind turbine?

Neither
The two systems mentioned above are difficult to produce and their reliability depends on mechanical components.
The protection most often used for small units is lateral erasure.
This involves offsetting the rotor and the pivot so that the torque exerted by the thrust on the blades is greater than the wind vane effect from a certain wind speed. ( I do not know if it's clear ? )
The wind turbine thus disoriented, sees the speed of its rotor decrease and leaves less "grip" to the wind.
I will try to find you an example in image.

A+

[loop]

Here is a sketch found on Ebonys
The rest is fine too, you can check the site

http://pagesperso-orange.fr/ebonys/imag ... ateral.htm

A+

[Gregconstruct]

If I understand the drawing correctly, the axis of the rotor is offset relative to the pivot of the nacelle ...

[loop]

Yes Greg,

you just made a much clearer summary than what I tried to explain just above.


But it's true that I'm a little twisted

A+

[Gregconstruct]

You're not twisted ... You're in a loop

Well that's good, I understand