Comment on the yaw stability of a horizontal-axis wind turbine at small angles of yaw

Report (1984)

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Published Date

13-09-1984

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NLR MP 84084 U

Abstract

The commonly used blade-element theory predicts a zero yawing moment in the time-average sense. Small-scale wind-tunnel experiments at the Eindhoven University of Technology revealed stable yawing moments at almost all operating conditions with the rotor in an upwind position with respect to the tower. The present comment shows, that this positive yaw stability can be explained, at least at small angles of yaw, by the "frozen" vortex wake concept.

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