激波的传播与干扰

Shock wave propagation and interactions

激波的传播特性既取决于激波的产生条件,也与所处的传播环境密切相关.驱动条件、几何边界、介质的物理化学属性等发生变化时,都会引起激波传播特性的改变,而激波的变化反过来又会对其波及的流场产生影响.尽管激波传播及其干扰现象广泛存在于自然界和人类科技活动之中,其复杂机理的认识、规律的描述乃至应用潜力的挖掘仍有漫长的路要走.本文根据气体中激波传播和干扰现象以及与之相关的理论描述特征,在对激波传播以及反射、折射等基本现象进行简要阐述的基础上,重点围绕目前的热点问题,包括激波/激波干扰、激波/边界层干扰、激波与湍流作用、激波的聚焦与点火以及激波作用下气体界面不稳定性等研究进行了介绍和讨论,旨在对近年来该领域的进展及获得的成果做一个概述和归纳,期望对将来的深入研究有一个鉴借意义.

The propagation of a shock wave depends not only on the conditions that it is generated, but also on the media where it propagates. Variations in driver condition, boundary condition and/or physical/chemical properties of the media may alter the behav- iors of the shock wave propagation, while the flowfield also varies along with the shock wave motion. Although shock wave propagation and interactions exist widely in the nature and human activities, there is still a long way to go for a better understanding of its complex mechanism, for theoretical descriptions of the phenomena, as well as for enrichment of the application. In this paper, we review the shock wave interactions and related analyses, and further discuss several hot topics, including shock/shock interaction, shock/boundary layer interaction, shock/turbulence interaction, shock focusing/ignition and instability of shocked interface.