小型风力机新翼型叶片动态结构响应研究

Aiming at the thickened blade of small wind turbine, a small wind turbine model is established and analyzed by finite element method based on ANSYS. The physical parameters of leaf blade are compared with the experiment results. The results indicate that the numerical simulation results has the same trend with the experimental results. Wind turbine blade stress concentrates mainly on roots and the central position of the blade, the stress value of blade root is maximum and near the tip of blade is smaller than in the central and the stress value of the front part is bigger than in rear part. The error of modal analysis is less than 6%. The blade load increase will lead to the increase of the dynamic natural frequencies of the blade. Meanwhile, the flapwise vibration corresponding to the natural frequency is greatly influenced by load. In buckling analysis, the maximum displacement area of trailing edge will appear from middle part to tip of the blade, so the structural strength of the trailing edge need be increased by reinforcement treatment.