Strength Analysis Of Fluid Solid Interaction Field Of MW Grade Wind Turbine Blades

Wind turbine is one of the main components of wind driven generator, the mechanical properties and aerodynamic efficiency of which have a close relationship with the performance of wind driven generator. A certain MW grade horizontal axis wind turbine blade was used as the main research model, the paper simulated its fluid solid interaction field by ANSYS and CFX based on ANSYS Workbench software platform and analyzed changes of blade deformation and stresses on the blade.The output torque of wind turbine was calculated under discrete range of pitch angle of blade root, which showed the only one maximum torque corresponded to the optimum pitch angle of blade root. Blades of different thickness were analyzed by fluid solid interaction simulation in conditions of the optimum pitch angle of blade root. Blade of composite material was analyzed by fluid solid interaction simulation. At the end, the paper analyzed the strength of an axis flow pump impeller based on fluid solid interaction technology.The result showed that optimum pitch angle of blade root is 13 degree. The stress concentrations of blades of different thickness all appeared at the middle of the blade side under compressive stress, which can easily lead to fatigue failure. And the blade tip had a quite large deformation which could cause the blade waving. The optimization design of wind turbine can be done through improving the comprehensive mechanics properties by changing the layers of composite material. The stress concentration of axial flow pump impeller occurred at the surface and the dangerous place of blade is at the root of joint. The growth rate of the maximum stress of impeller is higher than that of the rotate speed of axial flow pump.