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在低雷诺数下,对NACA0012翼型和风力机专用翼型S809的动态失速进行数值模拟。研究不同网格密度、湍流模型对俯仰振荡翼型数值模拟的影响,并与实验结果进行对比验证。数值模拟得出的气动力迟滞曲线与实验结果变化趋势符合较好,表明了数值方法的有效性。采用此方法研究了北航自主开发的风力机专用翼型的动态失速特性。通过分析表明该翼型在动态失速过程中升力系数下降平缓,俯仰力矩振荡变化不显著,适合应用于兆瓦级大型风力机叶片。
Under low Reynolds number, the dynamic stall of NACA0012 airfoil and airfoil S809 is simulated. The effect of different grid densities and turbulence models on the numerical simulation of pitch oscillation airfoils was studied and compared with the experimental results. The aerodynamic hysteresis curve obtained by numerical simulation is in good agreement with the trend of the experimental results, indicating the effectiveness of the numerical method. This method is used to study the dynamic stall characteristics of the airfoil dedicated to the wind turbine developed by Beihang. The analysis shows that during the dynamic stall, the lift coefficient of the airfoil decreases gently and the change of pitching moment is insignificant, so it is suitable for the large MW wind turbine blade.