非定常汇聚激波反射与折射研究进展  

Progress in unsteady converging shock reflection and refraction

作　　者：翟志刚[1] 王何 司廷[1] 罗喜胜[1] 杨基明[1] 韩肇元[1] ZHAI ZhiGang;WANG He;SI Ting;LUO XiSheng;YANG JiMing;HAN ZhaoYuan(Department of Modern Mechanics,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学技术大学近代力学系,合肥230027

出　　处：《中国科学：物理学、力学、天文学》2018年第9期172-189,共18页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(批准号:11772329;U1530103;11625211)资助项目

摘　　要：非定常激波反射及折射由于其重要的科学及工程意义,成为了近年来激波反射及折射研究领域的热点.平面激波在曲面上的非定常反射现象近些年得到了较多的研究,在这个过程中激波强度不变,入射角随着曲面曲率的变化而不断改变,从而出现波系转变现象.当一道曲面激波在固壁上反射时,激波强度以及入射角均不断发生改变,从而有可能对波系现象有较大的影响.但实验室条件下生成具有特定变化规律的曲面激波一直是一个难题.翟志刚等人通过激波动力学理论提出并实现了将平面激波光滑转变为柱形汇聚激波的方法.在设计的水平汇聚激波管中开展了非定常汇聚激波反射及折射研究.本文介绍了本实验室近几年在非定常汇聚激波反射与折射方面的研究进展,重点关注了持续变化的入射角以及流场的非定常性对波系转变的影响,并提出了未来的研究方向.Unsteady shock reflection and refraction have become increasingly attractive in recent years due to their significance in scientific and engineering areas. The unsteady phenomena of a planar shock wave reflecting over a curved wedge have been investigated. During this process, the shock intensity is unvaried while the incident angle keeps changing, which results in the transition between different wave patterns. When a curved shock wave moves along a solid wall or an interface separating two different fluids, both the shock intensity and incident angle are changing, which probably have significant influences on wave patterns and their transitions. Nevertheless, it is a difficult problem to create a curved shock wave with regularities in laboratory. Based on shock dynamics theory, Zhai proposed a method to transform a planar shock wave into a cylindrically converging one, and the investigations on reflection of a converging shock wave at a solid wall and on the refraction of a converging shock wave at a fluid interface were carried out. In this work, the progress in unsteady cylindrically converging shock wave reflection and reflection phenomena in our laboratory has been discussed, focusing on the effects of incident angle and flow unsteadiness on wave patterns transitions. Finally, we propose the following issues for future study.

关 键 词：柱形汇聚激波 非定常流场 激波反射 激波折射 

分 类 号：O354.5[理学—流体力学]