Transactions of Nanjing University of Aeronautics & Astronautics
Special Issue for Wind Turbine
A Model for Correcting the Stall Delay on Rotating Blades
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Abstract:
Stall delay is an important phenomenon on wind turbine blades. It makes the maximum aerodynamic load of a rotating blade much higher than that predicted without a correction. A new stall delay model is established in the present paper based on investigations into the flow around a rotating blade. The investigations indicate that the shrink of separation vortex caused by centrifugal force is the major reason for stall delay. Multiple factors relating to the rotational effects are considered in the model, including rotating speed, inflow velocity, local chord length and radial position. Validations for the model are made on the NREL Phase Ⅳ blade and the results show that the accuracy of the aerodynamic prediction for the blade is significantly improved as the model is applied.
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CHINA AERO-SCIENCES
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