VAWT - Cp increases continually

artie · November 27, 2015, 10:30

Hi all,

I am running 2D simulations for a vertical axis wind turbine in Ansys Fluent. The wind speed is fixed at 10m/s, and I am gradually increasing the rotational speed of the turbine in a series of simulations. I am taking the moment coefficient (Cm) of the wind acting on the turbine blades, then multiplying by tip-speed ratio (TSR) to find the performance coefficient (Cp) of the turbine.

Cm & Cp should increase as TSR increases, then begin to decrease as I pass the turbine's optimal TSR. The problem is that Cm & Cp are not decreasing; they are continuing to increase, even at speeds far above the typical optimal TSR.

Does anyone have any idea what I might be doing wrong? Thank you in advance.

Ahmed Saeed Mansour · June 10, 2016, 15:13

Have you solved the problem?

November 27, 2015, 10:30	VAWT - Cp increases continually	#1
artie New Member Join Date: Nov 2015 Posts: 1 Rep Power: 0	Hi all, I am running 2D simulations for a vertical axis wind turbine in Ansys Fluent. The wind speed is fixed at 10m/s, and I am gradually increasing the rotational speed of the turbine in a series of simulations. I am taking the moment coefficient (Cm) of the wind acting on the turbine blades, then multiplying by tip-speed ratio (TSR) to find the performance coefficient (Cp) of the turbine. Cm & Cp should increase as TSR increases, then begin to decrease as I pass the turbine's optimal TSR. The problem is that Cm & Cp are not decreasing; they are continuing to increase, even at speeds far above the typical optimal TSR. Does anyone have any idea what I might be doing wrong? Thank you in advance.

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June 10, 2016, 15:13		#2
Ahmed Saeed Mansour Senior Member Have a nice time! Join Date: Feb 2016 Location: mech.eng.ahmedmansour@gmail.com Posts: 291 Rep Power: 11	Have you solved the problem?