马赫反射波系冲击诱导平面界面失稳的数值模拟  

Numerical simulation of the instability of a planar interface subjected to a Mach reflection wave configuration

作　　者：张恩来 廖深飞 邹立勇[1] 刘金宏[1] 李欣竹[1] 梁正虹 ZHANG EnLai;LIAO ShenFei;ZOU LiYong;LIU JingHong;LI XinZhu;LIANG ZhengHong(National Key Laboratory of Shock Wave and Detonation Physics,Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]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全国重点实验室,绵阳621900

出　　处：《中国科学：物理学、力学、天文学》2024年第10期46-55,共10页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(编号:12102407,92052108);中国工程物理研究院院长基金(编号:YZJJLX2019001);冲击波物理与爆轰物理全国重点实验室稳定支持项目(编号:JCKYS2023212003)资助。

摘　　要：针对实际应用中面临的马赫反射波系冲击诱导界面失稳问题,通过数值模拟研究了马赫反射波系与平面N2/Kr气体界面作用的波系和界面演化过程,并分析了界面凹腔的形成机制.结果表明,马赫反射波系对平面界面失稳的贡献分两部分:一是波系非均匀冲击引起的界面速度扰动;二是波后流场中的局部高速质量流持续驱动界面变形.马赫反射波系中的反射激波对界面演化产生重要影响,其对界面的二次冲击极大地抑制了界面的斜压涡量和速度扰动,从而抑制界面的扰动增长.在马赫反射波系冲击界面后,流场中形成了贯穿界面的剪切层结构,这些剪切层包围的高速流体持续驱动界面发生剪切变形,最终演化为凹腔结构.To address the issue of interfacial instability caused by the impact of a Mach reflection wave configuration in practical engineering applications,numerical simulations were conducted to investigate the wave configuration and interface evolution resulting from the interaction between a Mach reflection wave configuration and a planar N2/Kr gas interface.The physical mechanism underlying the formation of interface cavity was analyzed.The results suggest that the contribution of the Mach reflection wave configuration to interface instability can be divided into two parts:firstly,the non-uniform impact of the shock front leads to velocity perturbations at the interface;secondly,the localized high-speed mass flow behind the shock waves drives deformation of the interface persistently.It is revealed that reflected shock waves within the Mach reflection wave configuration play a crucial role in the interface evolution,as their secondary impact significantly inhibiting baroclinic vorticity and velocity perturbations,thereby suppressing the perturbation growth of interface.Notably,the interaction between the Mach reflected wave configuration and interfaces results in shear layer structures within the flow field.The enclosed high-speed fluids within these shear layers continuously exerts shear deformation on the interface,ultimately leading to the formation of a cavity structure.

关 键 词：激波 RICHTMYER-MESHKOV不稳定性 马赫反射 数值模拟 

分 类 号：O35[理学—流体力学]