翼型跨声速动态失速过程的数值研究

Numerical Simulation on the Dynamic Stall Processof Airfoils in Transonic Flow

本文发展了一种模拟翼型跨声速动态失速过程的数值方法。采用ＬＵ分解隐式ＮＮＤ格式求解了二维非定常可压Ｎ－Ｓ方程组，湍流模型采用Ｂａｌｄｗｉｎ－Ｌｏｍａｘ双层代数模型。计算网格采用相对翼型固定的贴体运动网格。主要模拟了ＮＡＣＡ００１２翼型做俯仰简谐振荡运动时的跨声速动态失速过程，并讨论了振荡频率、振幅及平均迎角对动态失速过程的影响。

In this paper,a method is presented to simulate the dynamic stall process of airfoils in transonic flow.The flowfield around the oscillating airfoil is analyzed by solving the twodimensional time averaged compressible NavierStokes equations with the BaldwinLomax turbulence model.An implicit LowerUpperfactorized algorithm is constructed in a bodyfitted coordinate system.In the algorithm,an NND(Nonoscillatory,Nonfreeparameter,Dissipative) scheme which is a kind of the TVD (Total Variation Diminishing) schemes is adopted.The computation grid is generated by an algebraic method.To save computation time,the grid is rigidly attached to the airfoil.The numerical results show that the dynamic stall process is well simulated on NACA 0012 airfoil oscillating in pitch at a high incidence angle in a transonic flow.