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Can some explain to me how to calculate the power coefficient of a vertical axis wind turbine.

If you explain the steps invloved would be great or any external file location where I could refer.

I have below information

1) Lift Coefficient.

2) Drag Coefficient.

3) Angle of attack.

4) Rotational Speed.

5) Airfoil Dimensions.

Furthermore, I know how to calculate the tangential force coefficient (Ct) as well. I have tried to calculate the power coefficient, but it gives me a value over 1.0 which is impossible.

Looking forward to hearing