Long-term effect of Rayleigh–Taylor stabilization on converging Richtmyer–Meshkov instability
Long-term effect of Rayleigh–Taylor stabilization on converging Richtmyer–Meshkov instability
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DOI：
10.1017/jfm.2018.424
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发表时间：
2018-06
影响因子：
3.7
通讯作者：
Xisheng Luo;Fu Zhang;J. Ding;T. Si;Jiming Yang;Z. Zhai;C. Wen
中科院分区：
文献类型：
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作者：
Xisheng Luo;Fu Zhang;J. Ding;T. Si;Jiming Yang;Z. Zhai;C. Wen
在会聚激波管内实验研究了三维单模轻/重界面上的richmyer - meshkov不稳定性。汇聚激波管具有细长的试验截面，在较长的试验时间内，激波流动的非均匀性得以充分展现。在受会聚激波作用的无扰动界面中，减速现象是明显的。单模界面由于其最小的表面特征而呈现出三维特征，这导致了受冲击界面的分层演化。对于对称界面，定量发现扰动幅值在激波压缩后迅速增长到最大值，在再激波前迅速下降。这种界面振幅的快速减小归因于由轻/重界面的减速引起的显著的瑞利-泰勒稳定效应。当初始界面具有足够小的扰动时，瑞利-泰勒稳定的长期效应甚至导致界面在再激波之前发生相位反转。还发现振幅增长受到三维效应的强烈抑制，有利于相位反转的发生。
The Richtmyer–Meshkov instability on a three-dimensional single-mode light/heavy interface is experimentally studied in a converging shock tube. The converging shock tube has a slender test section so that the non-uniform feature of the shocked flow is amply exhibited in a long testing time. A deceleration phenomenon is evident in the unperturbed interface subjected to a converging shock. The single-mode interface presents three-dimensional characteristics because of its minimum surface feature, which leads to the stratified evolution of the shocked interface. For the symmetry interface, it is quantitatively found that the perturbation amplitude experiences a rapid growth to a maximum value after shock compression and finally drops quickly before the reshock. This quick reduction of the interface amplitude is ascribed to a significant Rayleigh–Taylor stabilization effect caused by the deceleration of the light/heavy interface. The long-term effect of the Rayleigh–Taylor stabilization even leads to a phase inversion on the interface before the reshock when the initial interface has sufficiently small perturbations. It is also found that the amplitude growth is strongly suppressed by the three-dimensional effect, which facilitates the occurrence of the phase inversion.