马赫反射波系在平面重/轻界面的入射加载

打开文本图片集

中图分类号：0354.5 国标学科代码：13025 文献标志码：A

Abstract： The evolution of a planar heavy/light gas interface （SF6/N2） subjected to a perturbed shock wave produced by diffractingaplanar incidentshock overarigidcylinderisinvestigated bynumericalandtheoreticalanalysis，particularly focusing onthe incident impact stageofMach reflection waveconfiguration.While the Machnumberofincidentplanar shock wave is1.8，umericalschliereimagesoftheMachrflectionwaveoverarigidcylnderareprovided，andthe waveevolution duringthe incidentimpact onthe heavy/light interfaceisquantitativelyanalyzed.Utilizingthe tree-shock theory，a thoretical solutiondescribingtherefractioprocsisderived，ichaccuratelypredicts teostrefractionsockwavesape，aswells thevelocityperturbationandcirculationdepositionon theinterface.Additionall，bydrawing shock polarcurvesand rarefaction wave characteristic lines，the pressurechanges and flow deflectionacross the wave configuration during the incident impactprocessarestraightlydescribed.Boththeresultsof theoreticalanalysisand numericalsimulationindicate that thediffrences in shock intensityand incident angles within the Mach reflection wave configuration lead tothe velocity perturbation onthe interface. Andthe tangential velocity caused by the shock impact results incirculation deposition on the interface.Velocity perturbation and circulation deposition dominate theearly evolution of the heavy/light interface.

Keywords：Richtmyer-Meshkov instability; Mach reflection wave configuration; heavy/lightinterface; hree-shock theory

当激波加载密度分层的流体界面时，界面上的初始扰动将被放大，经过线性、非线性的演化增长最终发生物质混合，这一类界面流动失稳现象被称为Richtmyer-Meshkov（RM）不稳定性[1-2]。（剩余20015字）