Analysis of Aerodynamic Performance of Wind Turbine Airfoil under the Same Relative Thickness

The aerodynamic performance of airfoils influences the efficiency of the wind turbine generator directly.Three different kinds of airfoils with the same 21 percent relative thickness and different shapes,that is NACA0021,NACA63421 and NREL-S809,are chosen to establish 2D model and partition mesh.Compared with difference of airfoil shapes,Fluent software is applied to simulate the aerodynamic performance of the airfoils when the Renald number is given 5.5×105.Then comparison of the experimental data,lift-resistance coefficients and its ratio of airfoils are obtained under the different angles of attack.The results show that the aerodynamic performance of the bent blade NACA63421 is better than those of other blades under the conditions of the same relative thickness and the lower Reynolds number,which provides references for selection and design airfoils of wind turbine blade.