柱状汇聚激波冲击单模气体界面的实验研究  

Experimental Study of the Interaction of Single-Mode Gas Interface with Cylindrical Converging Shock Wave

作　　者：李阳[1] 丁举春[1] 翟志刚[1] 司廷[1] 

机构地区：[1]中国科学技术大学近代力学系先进推进实验室,合肥230027

出　　处：《实验力学》2017年第6期733-740,共8页Journal of Experimental Mechanics

基　　金：国家自然科学基金(11272308;11302219和NSAF U1530103)

摘　　要：在自行设计和加工的半环形汇聚激波管中,开展了柱状汇聚激波冲击单模Air/SF6气体界面的Richtmyer-Meshkov(RM)不稳定性实验研究。不同于以往的环形激波管,该激波管具有半圆形结构的实验段,使半环形管道和实验段都向外敞开,能够参考传统水平激波管的方式设置初始扰动界面和观测系统。采用线约束肥皂膜的方法形成单模初始扰动界面。利用高速纹影成像技术得到了柱形汇聚激波作用下界面演化的完整过程。为了研究初始振幅对界面演化形态的影响,实验中生成了三种不同初始振幅的单模界面,并获得了三种工况下界面位移和扰动振幅随时间的变化。结果表明,汇聚激波作用下的RM不稳定性与平面激波有很大差别,主要原因在于汇聚效应,包括结构汇聚、流动压缩以及界面反相等。Richtmyer-Meshkov（RM）instability of a single-mode Air/SF6 gas interface interacting with cylindrical converging shock wave was experimentally studied in a self design and processing semi-annular converging shock tube.Different from previous annular shock tubes,this shock tube has a semicircle experimental section,which makes the semi annular pipe and experimental section are outward open and can refer to the traditional horizontal shock tube way to set the initial disturbance interface and observation system.In this work,single-mode initial disturbance interface is formed by using line constrained soap film method.Complete evolution process of interface subjected to action of cylindrical converging shock wave was obtained by high speed schlieren photography.In order to study the influence of initial amplitude on interface evolution,a single mode interface with three different initial amplitudes was generated,under three working conditions,the variations of interface displacement and disturbance amplitude along with time were obtained,respectively.Results show that RM instability produced by converging shock wave is very different from that of plane shock wave.The main reason lies in the convergence effect,including geometric convergence,the flow compression and interface phase inversion.

关 键 词：柱状汇聚激波 RICHTMYER-MESHKOV不稳定性 单模界面 高速纹影法 

分 类 号：O354.5[理学—流体力学]