强湍流相干结构位置的改变对风力机叶根载荷的影响研究

Research on the Influence of the Change of Strong Turbulent CoherentStructure Position on the Wind Turbine Blade Root Load

真实环境运行的风力机常受到强湍流相干结构对其的影响,而湍流相干结构的发生具有空间位置的不确定性和随机性,叶片作为捕获风能的主要部件其载荷直接关系到风力机运行的安全性,因此该文对湍流相干结构位置的改变对叶根载荷的影响展开研究。结果表明,湍流相干结构位置的改变对摆振力矩影响较小,位置的下降会使得挥舞力矩趋于稳定且波动集中;叶根挥舞方向的载荷约为摆振方向3.5倍;叶根载荷波动具有低频高能的特点,当湍流相干结构中心位于轮毂中心时叶根载荷最大。

Wind turbines operating in a real environment are often affected by strong turbulent coherent structures,and the occurrence of turbulent coherent structures has uncertainty and randomness in spatial position.The blade as the main component of capturing wind energy,its load is directly related to the operation of wind turbine For safety,this paper studies the effect of the change of the position of the turbulent coherent structure on the blade root load.The results show that the change of the position of the turbulent coherent structure has little effect on the edgewise moment,and the decrease of the position will make the flapwise moment tend to be stable and the fluctuations concentration;The load in the flapwise direction of the blade root is about 3.5 times the direction of the edgewise;the blade root load fluctuation has the characteristics of low frequency and high energy,and the blade root load is the largest when the center of the turbulent coherent structure is located in the center of the hub.