Abstract:For airfoil inside of the wind turbine blade, the aerodynamic performance before and after modification was studied.The law of comprehensive improvement of airfoil was revealed in relative thickness, relative camber and trailing edge thickness of the inside of the blade.Through Profili and Matlab software, parametric processing airfoil relative thickness, relative camber and trailing edge thickness of the airfoil were parameterized.Profili and Fluent software were used to simulate. And the drag coefficient, lifttodrag ratio and airfoil surface pressure and velocity distribution of the improved airfoil were compared with the original airfoil. The results show that the comprehensive improvement of airfoil can not be simply by changing relative thickness, relative camber and trailing edge thickness according to their respective best comprehensive improvement, and the comprehensive improvement of airfoil method need to be studied further. Under the premise of ensure the structural strength the blade inside, according to the relative camber increase about 1% chord length on the basis of the best and the thickness of the trailing edge reduce about 2% chord length on the basis of the best, the improved airfoil aerodynamic performance is better. Study conclusions can be used by the wind turbine blade airfoil design and retrofit for quantitative reference.