Experimental study of initial condition dependence on Richtmyer-Meshkov instability in the presence of reshock
Experimental study of initial condition dependence on Richtmyer-Meshkov instability in the presence of reshock
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DOI：
10.1063/1.3693152
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发表时间：
2012-03
影响因子：
4.6
通讯作者：
S. Balasubramanian;G. Orlicz;K. Prestridge;B. Balakumar
中科院分区：
文献类型：
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作者：
S. Balasubramanian;G. Orlicz;K. Prestridge;B. Balakumar
本文对激波加速的Richtmyer-Meshkov（R-M）不稳定流体层中扰动的振幅δ和波数κ（κ = 2π/λ，λ为波长）与湍流和混合的关系进行了实验研究。在我们的实验中使用了一个单一的模式，无膜的静脉曲张重气幕（空气-SF6-空气）在冲击马赫数M = 1.2。采用平面激光诱导荧光（PLIF）和粒子图像测速（PIV）测量了该初始构型的密度（浓度）和速度场。为了了解多模态初始条件对激波加速混合的影响，在入射激波（M = 1.2）过程中形成的演化流体界面在不同时间使用可移动壁再次被反射激波冲击，从而使我们能够同时改变δ和κ。提出了一种无量纲长度尺度η = κδ，将初始条件依赖性与后期时间依赖性参数化地联系起来。
We present an experimental study on the dependence of initial condition parameters, namely, the amplitude δ and wavenumber κ (κ = 2π/λ, where λ is the wavelength) of perturbations, on turbulence and mixing in shock-accelerated Richtmyer-Meshkov (R-M) unstable fluid layers. A single mode, membrane-free varicose heavy gas curtain (air-SF6-air) at a shock Mach number M = 1.2 was used in our experiments. The density (concentration) and velocity fields for this initial configuration were measured using planar laser -induced fluorescence (PLIF) and particle image velocimetry (PIV). In order to understand the effects of multi-mode initial conditions on shock-accelerated mixing, the evolving fluid interface formed during the incident shock (M = 1.2) was shocked again by a reflected shock wave at various times using a movable wall, thus enabling us to change both δ and κ simultaneously. A dimensionless length-scale defined as η = κδ is proposed to parametrically link the initial condition dependence to late-time m...