考虑叶片桨距角和干扰效应的大型风力机体系风致效应研究

5 MW large wind turbine taken as the study object, large eddy simulation method is used to simulate the unsteady flow field and aerodynamic force of large-scale wind turbine system considering different blade pitch angles (0°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80° and 90°). The simulation results are compared with the standard and measured results to validate effectiveness of large eddy simulation. On this basis, Dynamic characteristics, wind-induced vibration response and stability of wind turbine tower-blade coupling system under different blade pitch angles are systematically analyzed combining finite element method. The main conclusions are as follows: when the blade pitch angle is 0°, negative pressure appears at 0° windward side on the significant interference zone of the tower, the maximum extreme value windward displacement of blade is 3.98 m. With the increase of blade pitch angle, the mean value and mean square error of radial displacement of tower top, blade windward displacement and shear of each blade root all show a decreasing trend, and significantly change in the range of pitch angle of 30°-50°. Under the condition of 0° blade pitch angle, wind-induced response of wind turbine system is the most disadvantageous. With 90°pitch angle, buckling behavior and ultimate bearing capacity of the system are the most disadvantageous.