Design and analysis of multi-megawatt wind turbines blades

Considering the change of circumferential velocity in the actual process of air flow, the aerodynamic shape of a 2 MW wind turbine blade is designed based on the Schmitz theory. The solid model for the blade is established using the three-dimensional coordinates of each section, which has been calculated by the coordinate transformation of the blade airfoil parameters. Then the solid model is imported to the finite element analysis software, and the influences of the layer thickness and ply angle on the modal characteristics and aerodynamic load of the blade are analyzed. The simulation results show that the modal characteristics are optimal when the layer thickness is 0.6 mm and the ply angle is 60 degrees, the aerodynamic concentrated load of the blades is increased linearly as the chord length growing, which the largest load is located in the largest chord length, and the maximum concentration stress on blade under applied of aerodynamic load is minimal when the ply angle is 44 degrees.