对旋双风轮风力机载荷特性风洞实验研究

EXPERIMENTAL STUDY ON LOAD CHARACTERISTICS OF COUNTERROTATING DOUBLE-WIND TURBINE WIND TURBINE IN WIND TUNNEL

为阐明对旋双风轮风力机前后风轮之间的载荷影响规律,基于风洞实验,测量对旋双风轮风力机3个正交方向的力和力矩,研究前后风轮间距和叶尖速比对载荷特性的影响规律。研究发现:高叶尖速比时,单风轮偏航力矩存在明显波动,而对旋双风轮风力机偏航力矩减小,且波动减弱;对旋双风轮风力机间距的变化影响前后风轮所承受的载荷占比,后风轮载荷占比随间距的增大而减小,这是由前后风轮之间所产生复杂的流动及湍流结构所致;虽然前后风轮的推力Fx和倾覆力矩My随叶尖速比的增大均有一定减小,但前后风轮的倾覆力矩Mx和偏航力矩Mz的方向相反,表明对旋双风轮风力机的前后风轮具有一定抵消倾覆力矩和偏航力矩的作用。

In order to elucidate the load influence law between the front and rear wind turbines of a counter-rotating twin-wind turbine,the paper is based on wind tunnel experiments to measure the forces and moments in three orthogonal directions of a counter-rotating twin-wind turbine,and to study the influence law of the front and rear wind turbine spacing and the tip speed ratio on the load characteristics.It is found that the yaw moment of the single wind turbine fluctuates significantly at high tip speed ratios,while the yaw moment of the counter-rotating twin-wheel wind turbine decreases and the fluctuation is weakened;the change of the pitch of the counter-rotating twin-wheel wind turbine affects the load share of the front and rear wind turbines,and the load share of the rear wind turbine decreases with the increase of the pitch,which is due to the complex flow and turbulence structure generated between the front and rear wind turbines;the thrust of the front and rear wind turbines,the tilting Although the tilting moment of the front and rear wind turbines decreases with the increase of the tip speed ratio,the tilting moment and yawing moment of the front and rear wind turbines are in opposite directions,which indicates that the front and rear wind turbines of the counter-rotating dual-wind turbine have the effect of counteracting the tilting moment and yawing moment to a certain extent.