中文摘要：

激波在不同密度介质上的交互作用在可压缩湍流上具有重要的基础价值。激波在界面上的作用会引起Richtmyer-Meshkov不稳定性。激波不正规折射时,流场存在更多复杂的涡。研究马赫数为1.23、1.41的激波在初始倾角β=60°的Air/SF6界面上非正规折射的情况。入射激波的切向冲击和法向冲击的相互作用,在界面处产生涡,折射波在壁面发生马赫反射。利用阴影显示技术,给出了界面演化和混合的过程。

英文摘要：

The interactions of shock waves with density inhomogeneities are of fundamental importance in compressible turbulence.This interaction is often referred to as the Richtmyer-Meshkov（RM）instability.In the irregular refraction case,it is a more complicated vorticity distribution.We focus on the specific case of a Mach 1.23 and 1.41 shock wave irregular refraction at a Air/SF6 gaseous interface,inclined at an angle of β=60° to the plane of the shock.In these experiments,it is found that vortices formed by the incident shock-side shock-normal shock interaction.The transmitted shock culminates as a Mach stem at the lower boundary.This paper reports the results of interfacial evolution and mixing,obtained from flow visualization experiments by the shadowgraph method.