Abstract：In order to suppress the aeroelastic deformation of wind turbine blades, a modified design of the bionic owl′s airfoil for large wind turbines was proposed. The effect of the bionic airfoil on the aero-elastic deformation of the blade was analyzed by the unidirectional fluid-structure coupling method, and the mechanism of the bionic airfoil suppressing the aeroelastic deformation of the blade was elaborated by modal analysis and resonance response. The results found that there is an 11.05% reduction in the aeroelastic deformation of the bionic airfoil blade compared to the model blade. The bionic airfoil makes the blade pressure surface stress distribution trend change, and makes the maximum stress value of the blade pressure surface transfer from the middle of the blade to the leading edge. The bionic airfoil makes the pressure difference between the upper and lower surface of the blade increase, and the pressure value of the suction surface is about twice the original, so that the blade in the flapping direction to improve the resistance to deformation. At the same time, the aerodynamic performance of the blades has been improved. The bionic airfoil pattern increases the first to sixth order intrinsic frequency of the blade, the bionic airfoil pattern causes an 89.23% reduction in the resonant deformation of the blade in the flapping direction, and also reduces the resonant velocity and acceleration amplitude of the blade. Therefore, the bionic airfoil can effectively suppress the aeroelastic deformation of the blade, and its design method and conclusion can provide a new idea for the research of suppressing aeroelastic deformation of large wind turbine blade.
