激波通过慢/快气体界面的折射研究(英文)

ON THE REFRACTION OF SHOCK WAVE OVER A SLOW-FAST GAS INTERFACE

本文给出了模拟激波通过两种不同气体界面时产生折射的方法.使用Harten的迎风TVD格式并改进了近似黎曼解算器使得两种气体界面的数值研究不需作任何特殊假设就可处理.获得了平面激波通过Air/CO_2和Air/He界面的部分实验数据。使用双方位曝光全息干涉仪观察到了激波的折射和发射。数值结果与实验有较好的一致性。最后讨论了靠近边界处气体界面的凹坑。

This study presents a numerical method to simulate the shock wave refraction over an interface of two different gases. Harten-Yee upwind TVD scheme is used and an approximate Riemann solver has been developed specially for this problem in which the two gases interface can be treated without any peculiar consideration. Some experimental data have been obtained for the refraction of a planar shock at Air/CO_2 and Air/He interface. The refraction and reflection of the shock wave as well as the flow field around it are visualized by using double exposure holographic interferometry. The numerical simulation results were compared with the experimental results, good agreement was obtained. The crater of the gaseous interface near the boundary is also discussed.