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利用带转捩修正的k-ωSST湍流模型,对绕其1/4弦长点作正弦波周期性振荡的S809翼型,在弦长雷诺数为106,不同的平均攻角、振荡幅度以及折合频率情况下的流场进行二维数值模拟。数值模拟得到的升力、阻力和俯仰力矩系数与OSU风洞试验的数据进行比较,对比显示两者的气动力迟滞闭环具有良好的一致性。利用流线分布对各工况下的动态流场特性以及动态失速涡的发展进行详细描述,证明CFD方法是预测风力机翼型动态失速特性的有效途径之一,分析了动态失速对于实际运行的风力机的影响,说明在风力机性能预估中考虑动态失速影响的必要性。
Using the k-ωSTST turbulence model with turbulence correction, the S809 airfoil, whose sinusoidal periodic oscillation is about 1/4 of its chord length, is found to have a chordal Reynolds number of 106, different average angles of attack, Frequency flow field for two-dimensional numerical simulation. The lift, drag and pitching moment coefficients obtained from the numerical simulations are compared with the data from the OSU wind tunnel test. The comparison shows that the aerodynamic hysteresis loop has good consistency. The characteristics of dynamic flow field under various conditions and the development of dynamic stall vortex are described in detail by using streamline distribution. It is proved that the CFD method is an effective way to predict the dynamic stall characteristics of wind turbine airfoils. It is also analyzed that the dynamic stall is not suitable for practical operation The impact of wind turbines illustrates the need to consider the effects of dynamic stalls in wind turbine performance prediction.