反射激波作用重气柱的Richtmyer-Meshkov不稳定性的实验研究

发布时间：2018-04-19 18:25

本文选题：流体力学 + Richtmyer-Meshkov不稳定性　；参考：《爆炸与冲击》2016年01期

【摘要】：采用高速摄影结合激光片光源技术,研究了反射激波冲击空气环境中重气体(SF6)气柱的Richtmyer-Meshkov不稳定性。通过在横式激波管试验段采用可移动反射端壁获得不同反射距离,实现了反射激波在不同时刻二次冲击处于演化中后期的气柱界面,得到了不同的界面演化规律。反射距离较小时,斜压机制对气柱界面形态演化的影响显著,界面衍生出二次涡对结构;反射距离较大时,压力扰动机制的影响显著,界面在流向上被明显地压缩,没有形成明显的涡结构。由气柱界面形态的时间演化图像得到了界面位置和整体尺度随时间的变化,对反射激波作用后气柱界面的演化进行了量化分析。
[Abstract]:In this paper, the Richtmyer-Meshkov instability of heavy gas SF6 gas column in the environment of reflected shock wave impingement on air is studied by using high speed photography and laser film light source technology.Different reflection distances are obtained by using movable reflector end wall in the transverse shock tube test section. The gas column interface of the secondary shock wave at different time is realized in the middle and late stage of evolution, and different interface evolution laws are obtained.When the reflection distance is small, the baroclinic mechanism has a significant effect on the evolution of the interface morphology of the gas column, and the secondary vortex is derived from the interface to the structure, and when the reflection distance is larger, the pressure disturbance mechanism is significantly affected, and the interface is obviously compressed in the direction of flow.No apparent vortex structure was formed.Based on the temporal evolution image of gas column interface morphology, the variation of interface position and global scale with time is obtained, and the evolution of gas column interface after reflected shock wave is analyzed quantitatively.
【作者单位】：中国工程物理研究院流体物理研究所冲击波物理与爆轰物理重点实验室;
【基金】：国家自然科学基金项目(11172278,11302201,11202195,11472253)
【分类号】：O354.5

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