航空学报 > 1995, Vol. 16 Issue (6): 688-691

运动激波绕射过程中的粘性效应

蔡罕龙, 李素循   

  1. 北京空气动力研究所,北京,100074
  • 收稿日期:1994-01-19 修回日期:1994-09-09 出版日期:1995-12-25 发布日期:1995-12-25

VISCOUS EFFECT IN MOVING SHOCK DIFFRACTION OVER OBSTACLES

Cai Hanlong, Li Suxun   

  1. Beijing Institute of Aerodynamics,Beijing,100074
  • Received:1994-01-19 Revised:1994-09-09 Online:1995-12-25 Published:1995-12-25

摘要: 应用 TVD格式求解二维非定常全 N- S方程 ,以研究运动激波绕射现象。考虑粘性后 ,绕凹角流动时 ,压缩拐角附近表面压力分布与实验结果更为符合 ;绕凸起物时 ,出现反射激波因边界层干扰根部加宽 ,前、后角点附近有局部分离与再附 ,并引起局部压力上升 (与无粘流场模拟相比 )等现象。结果表明 ,全 N- S方程可较好地模拟实际粘性流中复杂激波障碍物干扰流场特性

关键词: TVD格式, 激波, 粘性流, 纳维-斯托克斯方程

Abstract: A TVD scheme is used to solve the 2D unsteady full N S equation and the phenomenon of moving shock diffraction is studied. The surface pressure computed with viscous equations is more in agreement with experiment on a wedge corner. As a shock wave impinges on an obstacle, the reflex wave root is widened due to boundary layer interaction. Separating, reattachment and vortex induced by viscous effect in some region are shown in the paper. From the results, a numerical simulation with the full N S equation can get the characteristics of the shock wave interaction with the viscous effect.

Key words: TVD schemes, shock waves, viscous flow, Navier-Stokes equation

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