An elaborate experiment on the single-mode Richtmyer–Meshkov instability
An elaborate experiment on the single-mode Richtmyer–Meshkov instability
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DOI：
10.1017/jfm.2018.628
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发表时间：
2018-08
影响因子：
3.7
通讯作者：
Lili Liu;Yu Liang;J. Ding;Naian Liu;Xisheng Luo
中科院分区：
文献类型：
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作者：
Lili Liu;Yu Liang;J. Ding;Naian Liu;Xisheng Luo
在弱激波条件下，对单模空气/SF 6界面上的Richtmyer-Meshkov不稳定性进行了高保真实验研究。肥皂膜技术被扩展到创建单模气体界面是免费的小波长扰动，扩散层和三维性。捕获的界面形貌表明，不稳定性的演变显然涉及所有现有的结果中最小的实验不确定性。脉冲模型和其他非线性模型的性能进行了彻底检查，通过扰动幅度的时间变化。气泡或尖峰的单独生长表明所有非线性模型都可以提供气泡发展的可靠预测，但只有Zhang & Guo（J. Fluid Mech.，第786卷，2016年，pp. 47-61）可以合理地预测穗的发育。所获得的界面形态的清晰图像也提供了一个难得的机会来提取界面轮廓，使得可以执行界面轮廓的光谱分析，这实现了Zhang & Sohn（Phys. Fluids，第9卷，1997，第100页）的高阶非线性模型的首次直接验证。1106-1124）和Vandenboomgaerde等人（Phys. Fluids，第14（3）卷，2002，第1106 - 1124页）。1111-1122）在基本模式和高次谐波方面。结果发现，这两个模型显示出一个非常好的，几乎相同的精度预测的前两个模式。然而，Zhang & Sohn（1997）的模型由于使用较少的简化而在建模三阶谐波时变得更加准确。
High-fidelity experiments of Richtmyer–Meshkov instability on a single-mode air/ $\text{SF}_{6}$ interface are carried out at weak shock conditions. The soap-film technique is extended to create single-mode gaseous interfaces which are free of small-wavelength perturbations, diffusion layers and three-dimensionality. The interfacial morphologies captured show that the instability evolution evidently involves the smallest experimental uncertainty among all existing results. The performances of the impulsive model and other nonlinear models are thoroughly examined through temporal variations of the perturbation amplitude. The individual growth of bubbles or spikes demonstrates that all nonlinear models can provide a reliable forecast of bubble development, but only the model of Zhang & Guo (J. Fluid Mech., vol. 786, 2016, pp. 47–61) can reasonably predict spike development. The distinct images of the interface morphology obtained also provide a rare opportunity to extract interface contours such that a spectral analysis of the interfacial contours can be performed, which realizes the first direct validation of the high-order nonlinear models of Zhang & Sohn (Phys. Fluids, vol. 9, 1997, pp. 1106–1124) and Vandenboomgaerde et al. (Phys. Fluids, vol. 14 (3), 2002, pp. 1111–1122) in terms of the fundamental mode and high-order harmonics. It is found that both models show a very good and almost identical accuracy in predicting the first two modes. However, the model of Zhang & Sohn (1997) becomes much more accurate in modelling the third-order harmonics due to the fewer simplifications used.