Comment on the Yaw Stability of a Horizontal-Axis Wind Turbine at Small Angles of Yaw

摘要

Small-scale wind tunnel experiments on a wind turbine model revealed stable yawing moments at almost all operating conditions with the rotor in an upwind position with respect to the tower. It is shown that this positive yaw stability can be explained, at least at small angles of yaw, by the frozen vortex wake concept.