Turbulent mixing measurements in the Richtmyer-Meshkov instability
Turbulent mixing measurements in the Richtmyer-Meshkov instability
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DOI：
10.1063/1.4733447
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发表时间：
2012-07
影响因子：
4.6
通讯作者：
C. Weber;N. Haehn;J. Oakley;D. Rothamer;R. Bonazza
中科院分区：
文献类型：
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作者：
C. Weber;N. Haehn;J. Oakley;D. Rothamer;R. Bonazza
在垂直激波管中，采用一种新的宽带初始条件，对氦-丙酮混合气体与氩（A = 0.7）的界面上的Richtmyer-Meshkov不稳定性进行了实验研究。初始条件是通过首先在气体之间建立重力稳定的停滞平面，然后在界面处水平注入相同的两种气体以创建剪切层来创建的。沿剪切层的扰动沿着产生一个统计上可重复的宽带初始条件。界面加速由M = 1.6平面冲击波，和随后的湍流混合层的发展进行了研究，使用平面激光诱导荧光。由最新的实验时间，2.1毫秒后，冲击加速，该层被证明是完全湍流，超过湍流过渡标准的基础上的雷诺数和剪切层尺度。混合结构的最新时间，近各向同性的梯度分布的概率密度函数所看到的。
The Richtmyer-Meshkov instability is experimentally investigated in a vertical shock tube using a new type of broadband initial condition imposed on an interface between a helium-acetone mixture and argon (A = 0.7). The initial condition is created by first setting up a gravitationally stable stagnation plane between the gases and then injecting the same two gases horizontally at the interface to create a shear layer. The perturbations along the shear layer create a statistically repeatable broadband initial condition. The interface is accelerated by a M = 1.6 planar shock wave, and the development of the ensuing turbulent mixing layer is investigated using planar laser induced fluorescence. By the latest experimental time, 2.1 ms after shock acceleration, the layer is shown to be fully turbulent, surpassing both turbulent transition criteria based on the Reynolds number and shear layer scale. Mixing structures are nearly isotropic by the latest time, as seen by the probability density function of gradien...