扰动激波与颗粒群的RM不稳定性研究  

The Investigation of RM Instability of Particles Driven by a Perturbed Shock Wave

作　　者：李林飞 金台 邹立勇[3] 罗坤[1] 樊建人[1] LI Linfei;JIN Tai;ZOU Liyong;LUO Kun;FAN Jianren(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China;School of Aeronautics and Astronautics,Zhejiang University,Hangzhou 310027,China;Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]浙江大学能源工程学院,杭州310027 [2]浙江大学航空航天学院,杭州310027 [3]中国工程物理研究院流体物理研究所,绵阳621900

出　　处：《工程热物理学报》2025年第1期158-163,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.52076194,No.92052108);冲击波物理与爆轰物理重点实验室基金项目(No.2021JCJQLB05704)。

摘　　要：针对平面激波绕过圆柱产生的扰动激波与N2/SF6轻重气体界面相互作用产生的Richtmyer-Meshkov不稳定问题进行了数值模拟,研究了SF6中不同大小颗粒对不稳定发展的影响规律。计算结果表明,对于5µm、20µm、50µm三种不同尺寸的颗粒,反射激波与轻重气体界面作用的时间和位置不同,50µm的颗粒中界面演化更充分,后期湍流化程度更高;比较反射激波与界面作用形成的涡旋结构的发展演化,SF6气体中会形成较多的尖钉、气泡结构,尖钉“腿部”由于剪切形成KH不稳定涡旋,最终形成大小不等的涡旋结构,转捩为湍流;5µm的小颗粒由于惯性小,跟随流体的运动能力更强,后期颗粒群演化出尖钉气泡结构,50µm的颗粒惯性大,与流体运动差别大,颗粒空间分布与气体界面不稳定发展有较大不同。The Richtmyer-Meshkov instability of perturbed shock waves,generated by a planar shock wave passing around a cylinder,interacting with N2/SF6 light and heavy gas interfaces has been numerically investigated,from which the effect of particles with different sizes in SF6 on the development of RM instability is explored.The results indicate that,for particles of all three different sizes(5µm,20µm,and 50µm),the time and location of the interaction between the reflected shock wave and the light/heavy gas interface vary.The interface evolution of the 50µm particles is more fully-developed,with a higher degree of turbulence in the late stage.Comparing the development of vortex structures formed by the interaction of the reflected shock wave and the interface,numerous spikes and bubble structures are formed in SF6 gas.The legs of the spike undergo KH instability,eventually transitioning into turbulence.Due to the small inertia,the 5µm particles follow the carrier fluid motion more quickly,evolving into spike/bubble structures in the late stage.In contrast,the 50µm particles,with greater particle inertia,manifest substantial differences in motion from the fluid,exhibiting significant differences in spatial distribution from the unstable development of the gas interface.

关 键 词：扰动激波 RM不稳定 密度界面 颗粒 数值模拟 

分 类 号：TK121[动力工程及工程热物理—工程热物理]