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摘要: 实验研究了低马赫数(1.27)激波作用air/SF6 界面的RM 不稳定性问题。air/SF6初始正弦界面 由厚度为1~2 mm 的薄膜相隔得到,用阴影法测试界面演化过程。实验结果表明:由于不稳定性重流体 (SF6)向轻流体(air)演化成尖钉结构,而轻流体演化为气泡结构;由于界面切向速度差的Kelvin-Helmholtz 不稳定性,尖钉头部翻转成蘑菇头形状;之后,蘑菇杆破碎。扰动振幅发展的实验结果与Zhang-Sohn 模型和PPM 数值计算的结果较吻合。
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关键词:
- 流体力学 /
- Richtmyer-Meshkov不稳定性 /
- 阴影方法 /
- air/SF6 界面 /
- 激波 /
- 激波管
Abstract: Inashocktube,theair/SF6interfacewasacceleratedbytheincidentshockwavewiththe low Machnumberof1.27.Theinitialsinusoidalinterfacewasobtainedbyapplyingthepolymeric membranewiththethicknessof1~2mandtheinterfaceevolutionwasmonitoredbyusingthetimeresolvedshadowgraphtechnique. TheRichtmyer-Meshkov (RM)instabilityofthesinusoidalinitial perturbationattheair/SF6interfaceswascharacterizedbythespikesoftheheavyfluid(SF6)falling intothelightfluid(air)andthebubblesofthelightfluid(air)risingintotheheavyfluid(SF6). DuetotheRichtmyer-Meshkov (RM)instabilitycausedbythetangentialvelocitydifferenceatthe air/SF6interfaces,theheadsofthespikesoverturnedintomushroomshapesandsubsequently themushroompolesbrokeup.AndthisRMinstabilitycausedthespikestobreakup.TheexperimentaldisturbanceamplitudeisinagreementwiththeresultsbytheZhang- Sohn modelandPPM simulation. -
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