Numerical Simulation of Airfoil Dynamic Stall of Horizontal Axis Wind Turbine

Dynamic stall of the airfoil NACA23012 was studied by numerical simulation method.The coefficient of lift was calculated in different angle of flow attack in an oscillation cycle.Further more,the hysteresis effect induced by the key parameters of the pitching movement was analyzed.The results show that the peak lift coefficient of a pitching airfoil is larger than that of static airfoil and the actual output power of the wind turbine is larger than its theoretical value.The more the mean angle of attack is,the larger the lift coefficient and the critical stall angle of attack are.With the increases of the oscillation amplitude and the reduced frequency,the hysteresis effect becomes more significant.The simulation results are well with the experimental data,so it is feasible to analyze the trend of the aerodynamic parameters of the pitching airfoil using simulated values.