中文摘要：

本文采用非嵌入式概率配点法对风力机NREL_S809翼型进行了不确定性CFD模拟。在两种特征攻角下,量化了当来流攻角存在不确定性变化时,翼型气动特性的变化,以及不确定性扰动在流场中的传播。研究结果表明,攻角的不确定性对于大攻角工况下流动的影响更大。对小攻角条件下的影响主要体现在翼型前缘处,而大攻角条件下的影响还扩展到了翼型中部和尾缘部分。

英文摘要：

In the present paper,non-deterministic simulations were performed on the airfoil NREL S809 under two typical angles of attack（AOA）.The non-intrusive probabilistic collocation method was employed to simulate the propagation of uncertainty in flow field.The variation of aerodynamic performance was quantified with the uncertain AOA.The simulation results show that the influence of the AOA uncertainty mainly locates at the leading edge of the airfoil for a low AOA.That influence for a high AOA expands to the middle and the trailing edge of the airfoil.