直升机旋翼悬停流场的粘性数值模拟

在旋转坐标系下求解可压缩NS方程,对Caradona-Tung旋翼的跨声速悬停流场进行了数值模拟,计算中采用嵌套网格方法,并且应用了多重网格技术加速流场收敛。计算结果表明,多重网格技术显著改善了流场的收敛效率,计算量仅为单重网格的四分之一。文中同时还对无粘和粘性流场进行了对比,NS方程考虑了物面的粘性作用,能正确模拟出激波和边界层的干扰现象,计算得到的桨叶表面压力分布与实验值更加吻合。

Numerical simulation of viscous flow-fields around helicopter rotor

The compressible Navier-Stokes equations are solved on non-inertial rotating coordinate system to simulate hovering Caradona-Tung rotor when the blade tip speed is transonic,overlapping grids are adopted in the computation and multigrid algorithms are used to speed up the convergence history of computation.The results show that multigrid improves the efficiency markedly,the cost is only 1/4 that of single grid.In addition,the inviscid and viscous computation are compared in this paper,the NS equations take ...