The wind wheel blades' aerodynamic performance determines the power and load characteristics of wind turbine

while the blade airfoil is the key factor influencing the blade aerodynamic performance.Different types of airfoil shape have certain aerodynamic rules.To enhance the wind turbine performances

numerical simulation was carried out by taking an NACA 4409airfoil(convex airfoil representative airfoil)as the example

employing the XFLR 5program.The results show that selecting an appropriate airfoil camber has dramatic effect on enhancing the airfoil aerodynamic performance.Furthermore

the feasibility of using high-lift-airfoil as vertical axis wind turbine blade airfoil was discussed.The results show that the high lift airfoil has excellent aerodynamic performance in a positive angle of attack range but a poor one in the negative angle of attack.