转速对风机叶片位移和应力的影响

以NREL 5MW风力机为研究对象，基于ANSYS Workbench平台建立风力机叶片流固耦合数值模型,研究风力机叶片位移、应力随转速的变化规律，并利用Fourier函数拟合不同转速下叶片最大位移和应力数据。结果表明：叶片的位移、应力响应均随转速增加，峰值左移，在相同时间内完成周期增多，峰值增大但增幅减小；随转速增加，位移呈现出从叶根向叶尖递增的分布，而叶片最大应力集中在中部和根部；叶片最大应力、位移随转速变化的曲线呈现S型，Fourier拟合曲线较好地反映了叶片响应规律。该研究结果为风力机安全运行提供了参考。

Influence of Rotating Speed on Displacement and Stress of Wind Turbine Blade

A NREL 5MW wind turbine was chosen as the research object, and the fluid structure coupling numerical model of the wind turbine blade was established based on ANSYS Workbench platform. The variation laws of displacement and stress of the wind turbine blade with rotating speed were explored, and the data of the maximum displacement and stress of the wind turbine blade under different rotating speeds were fitted by using Fourier function. The results show that the displacement and stress response of the blade increase with the speed, and the peak values move to the left, the period increases in the same amount of time, and the peak value increases but the increase amplitude decreases; with the increase of rotating speed, the displacement shows an distribution increased from the blade root to the tip, while the maximum stress of the blade concentrates in the middle and the root. The curves of the maximum stress and displacement of the blade with the change of rotating speed present S shape, and the Fourier fitting curve well reflects the response law of the blade. The results provide reference for the safe operation of wind turbines.