科研之友
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摘要
As a large offshore structure with a rigid flexible rotating body, a floating wind turbine undergoes harsh service environment. Its multi-body and multi-field dynamic coupling mechanism is extremely complex, which has become a key bottleneck restricting the development of floating wind power technology. This paper studies the aerodynamic characteristics of a wind turbine model in a wind tunnel by varying the pitching motion of a six-degree-of-freedom platform on which the model is installed. The variation of aerodynamic performance with the pitching amplitude of the platform is obtained under the condition of steady incoming flows. In the static tilt experiment, the power coefficient decreases with the increase of the pitch angle, while the opposite is true for the pitch- and yaw-torque coefficients. A similar trend can also be found by increasing the yaw angle. This is because larger pitch or yaw angles make the model more inclined, which reduces the lift but increases the resistance considerably. In the dynamic experiment, the torque fluctuation manifest a "hysteresis loop" with respect to the pitching angle that is sensitive to the pitching amplitude. Specifically, the hysteresis loop of the fluctuating yaw-torque coefficient is counterclockwise while that of the fluctuating pitching-torque coefficient is clockwise. This paper reveals the influence law of specific platform motion on the aerodynamic performance of a wind turbine, which is of great significance for the aerodynamic and hydrodynamic control of wind turbines under the multi-physics coupling of wind, wave, and current.
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