表面粗糙度对翼型气动特性影响的数值模拟

Numerical Simulationson the Effect of Surface Roughness on Airfoil Aerodynamic Performance

本文采用CFD数值模拟方法结合概率配点法研究了当翼型表面粗糙度存在不确定性变化时,NREL_S825风力机翼型的气动特性与绕流场参数分布。获得了两种特征攻角下翼型气动特性的变化,以及不确定性在绕流场中的传播。研究结果表明,升力系数对粗糙度的不确定性较为敏感。粗糙度不确定性对翼型绕流场的影响主要出现在翼型前缘、尾缘和分离区等速度梯度较大区域,并且吸力面压力系数分布对粗糙度的敏感性明显高于压力面。

In the present paper,CFD numerical simulations have been performed on the airfoil NREL_S825 with a stochastic roughness height of the surface.The probabilistic collocation method is employed to simulate the propagation of uncertainties through the flow field.The stochastic variation of the aerodynamic performance and the flow variables in the flow field are obtained.The results show that the lift coefficient is more sensitive to the uncertainty of roughness than the drag coefficient.The influence of the uncertainty mainly appears at high velocity gradient regions at leading edge,trailing edge and the flow separation region.The pressure coefficient at suction side is more sensitive than that at the pressure side.