Performance Predictions Of NREL Phase VI Combined Experiment Rotor Using A Free-Vortex Wake Model

This paper describes the application of a free-vortex wake method (FVM) to predict the performance and aerodynamic loads on an upwind wind turbine in unyawed and yawed flow. Measurements from the Phase VI of the NREL/NASA Ames wind tunnel test were used for validating the predictions. The FVM predicted well the variation of the turbine thrust and the aerodynamic power output with wind speed. Spanwise distributions of the aerodynamic coefficients (normal force, leading-edge thrust and pitching moment) were also predicted, and encouraging agreement was obtained against the measured coefficients. The azimuthal variation of loads showed that the unsteady aerodynamic behavior of the the wind turbine was predicted well, with some exceptions. However, the vibration modes of the blade, tower, and drive-train seemed to have a significant influence on the measured loads in the experiment.

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