激波管实验研究非均匀流场R-M不稳定性  

Experimental Study of Richtmyer-Meshkov Instability in Nonuniform Flow by Shock Tube

作　　者：刘金宏[1] 谭多望[1] 柏劲松[1] 黄文斌[1] 邹立勇[1] 张旭[1] 

机构地区：[1]中国工程物理研究院流体物理研究所冲击波物理与爆轰物理重点实验室,四川绵阳621900

出　　处：《实验力学》2012年第2期160-164,共5页Journal of Experimental Mechanics

基　　金：国防科技重点实验室基金(9140C6710011006);国家自然科学基金(11072226)资助

摘　　要：利用激波管装置及马赫数为1.27的弱入射激波实验研究了SF6非均匀流场的R-M不稳定性。Air/SF6初始正弦界面由厚度为0.5μm的薄膜相隔得到,由阴影方法记录界面演化过程。实验结果表明:由于不稳定性,重流体(SF6)向轻流体(Air)演化成"尖钉"结构,而轻流体演化为"气泡"结构;由于界面切向速度差的Kelvin-Helmholtz不稳定性,"尖钉"头部翻转成蘑菇头形状;由于流场密度分布不均,低密度区流场扰动增长较快,扰动振幅发展的实验结果与PPM数值计算的结果较吻合。Richtmyer-Meshkov instability in SF6 nonuniform flow was experimentally studied by producing a weak incident shock wave with Mach number 1. 27 in a shock tube. Initial sinusoidal interface between Air/SF6 was formed by a polymeric membrane with thickness of 0. 5μm and the interface evolution was measured by using shadowgraph method. Experimental result show that the instability is characterized by ＂spike＂of heavy fluid falling into lighter fluid and the bubbles of lighter fluid rising into heavy fluid. At the edge of spike, rolling mushroom occurs due to Kelvin-Helmholtz instability produced by the defference of interface tangential velicities. Evolution of flow disturbance grows faster in the low density zone due to the initial density nonuniformity in flow field. Experimental results of disturbance amplitude growth are in good agreement with PPM simulation results.

关 键 词：RICHTMYER-MESHKOV不稳定性 阴影摄影法 非均匀流 

分 类 号：O354.5[理学—流体力学]