This paper provides insights into the process driving the fast transition of an impulsively accelerated, then decelerated interface between gases of different densities, such as the one produced by the Richtmyer-Meshkov instability, when the timescale of this transitional process is of the same order as the characteristic timescales representative of the resulting turbulence. In this context, a new experimental approach is exposed. For the first time, it allows to design well-defined initial gaseous interfaces in a multiparametric and controlled way, giving access to a precise statistical analysis of the flow. An overview of the main results obtained by means of strioscopic, particle image velocimetry and tomoscopic measurements is provided. They unravel the fast transition of the mixing zone to a turbulent state, as the imprint of the initial condition is lost and the dynamical spectral content covers a wide range of scales, compatible with the achievement of a self-similar trend on very short timescales.

中文翻译：

---

Richtmyer-Meshkov不稳定性引起的气体混合区的湍流过渡

本文提供了有关驱动不同密度的气体在脉冲加速，然后减速接口之间快速过渡的过程的见解，例如由Richtmyer-Meshkov不稳定性产生的那种，此时过渡过程的时间尺度与代表产生的湍流的特征时标。在这种情况下，一种新的实验方法被公开。它首次允许以多参数和受控方式设计定义明确的初始气态界面，从而可以对流量进行精确的统计分析。提供了通过频闪，粒子图像测速和断层测量获得的主要结果的概述。他们解开了混合区到湍流状态的快速过渡，