Dear David,
For a given rotor, you can use a tool like the standalone driver for AeroDyn v15 (nwtc.nrel.gov/AeroDyn) to compute the aerodynamic power (Cp), thrust (Ct), and torque (Cq) coefficients as a function of blade-pitch angle and tip-speed ratio. These coefficients for the NREL 5-MW rotor are discussed in the following forum topic: NREL 5-MW reference turbine - CP, CQ, CT Coefficients.
Best regards,