## torque coefficient

Topics of general, but wind-related interest.

Moderator: Bonnie.Jonkman

encieh.baqeri
Posts: 11
Joined: Tue May 22, 2018 12:23 am
Organization: self
Location: iran

### torque coefficient

hi jason
How can I calculate the pitch angle that producing the desired torque, I see in most papers that they were calculate this, by using interpolation from the Cq graph(relation between pitch angel,landa and torque coefficient) , now my question is How can I get Cq graph for FAST's turbines?

Jason.Jonkman
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Location: Boulder, CO
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### Re: torque coefficient

Dear Encieh,

You can use the standalone driver for AeroDyn v15 to calculate the surface of power, torque, thrust (etc.) coefficient versus tip-speed ratio and blade-pitch angle. See the following forum topic of more information: viewtopic.php?f=2&t=1989&p=10511 (this assumes a rigid rotor).

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

encieh.baqeri
Posts: 11
Joined: Tue May 22, 2018 12:23 am
Organization: self
Location: iran

### Re: torque coefficient

hi jason
at first thank you very much for your useful responses,i have another question:how can i generate Cq in all of possible ranges?i generated it in special condition and so it's not all of Cq that possible for this turbin,(i know that exist a lot of Cq that is not posible to reach all of them ,i want a reasonable range of them that i can plot a figure of them such as the pictures in many papers)

Jason.Jonkman
Posts: 3920
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

### Re: torque coefficient

Dear Encieh,

The combined-case section of the standalone AeroDyn input file allows you to run multiple cases...each with different wind speeds, rotor speeds, pitch angles, etc. You can use this feature to generate a complete Cq surface.

Best regards,