弹体穿越平面激波三维非定常流场的数值模拟

Computational simulation of three dimensional unsteady flow field induced by a body overtaking a shock wave

用数值方法求解三维非定常可压缩Navier Stokes方程,计算了复杂弹体在相同马赫数、不同迎角下的流场和气动力特征,计算结果与实验结果吻合,证明本文采用的方法能够准确计算此类复杂流场;然后采用该方法模拟了弹体穿越正激波的非定常过程,得到了弹体周围流场及气动力特征随穿越过程的非定常变化,阻力特征穿越后急剧下降。

Numerical simulations of the flow fields and aerodynamic characteristics around a complex contour projectile, in one Mach number but at different anglesat attacks, are carried out by solving three dimensional unsteady compressible Navier-Stokes equations. The computational solutions are well consistent with the experimental results, so the method can solve the complicated flow field accurately. The unsteady flow field around the projectile overtaking shocks is simulated by the method, and the unsteady variation about the flow field and aerodynamic characteristics around the projectile are obtained. The drag is sharply decreased after the projectile overtaking shocks.