运动物体与运动激波干扰流场特性数值研究

Computational analysis of the unsteady flow induced by the interference between a moving body and a moving shock wave

用数值方法求解非定常可压缩Navier-Stokes方程,模拟了运动物体分别以超声速和亚声速穿越激波的全过程。在这两种情况下,激波都是从高压区运动到低压区,阻力急剧地减小,但在亚声速情况下,会在物体上产生不对称力和力矩,导致运动物体的不稳定。

The numerical simulations of the flow field around double-wedge shaped projectile overtaking shocks are carried out by solving the unsteady compressible Navier-Stokes equations. Two test cases of the supersonic overtaking and the subsonic overtaking are considered. A rapid reduction of the drag force is observed in both cases as the projectile moves from the high pressure region to the low pressure region. The strong asymmetric force and torque that may create an unstable projectile motion are observed only in the case of the subsonic.