A STUDY ON JET PHENOMENON OF R22 GAS CYLINDER UNDER THE IMPACT OF SHOCK WAVE
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摘要: 重物质气泡在平面激波作用下出现射流是一个非常有趣的物理现象, 它与气体属性、激波强度密切相关, 气泡内外波系结构复杂, 值得进行深入探讨. 论文采用水平集方法结合真实虚拟流体方法捕捉物质界面, 对R22圆柱气泡在平面激波作用下的射流现象进行了数值模拟, 详细阐述了波系结构在气泡内外的演变过程, 总结了导致气泡射流现象形成的典型波系结构特征, 从波系结构角度解释了射流形成的原因.论文也对不同强度的激波冲击R22圆柱气泡的情况进行了归纳, 发现激波强度对射流现象的出现以及射流结构的尺寸特征有重要影响, 得出了 R22圆柱气泡能否出现射流结构的临界激波强度, 以期对实验结果起到指导与验证作用.Abstract: The jet formation of a heavy gas cylinder under planar shock wave impact is a very interesting phenomenon which is closely associated with the gas properties and the shock wave strength. It is worthwhile to investigate the complex wave structure in this process due to its academic value. The R22 cylinder jet formation process under planar shock wave impact is simulated using Level Set method to capture the gaseous interface, and rGFM to define the interfacial boundary conditions. The development of wave structure is elucidated, typical wave patterns that lead to the jet formation is highlighted, and the reason of the jet formation is expounded from a perspective of wave pattern. Cases with different shock strengths are presented in this study. It is found that the shock strength plays an important role in determining the formation of jet and even the characteristics of the jet structure if the jet is formed. A critical shock strength is concluded beyond which the jet cannot be formed. It is expected that the presented results could guide and verify the experimental results.
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Key words:
- shock wave /
- R22 cylinder/bubble /
- jet phenomenon /
- level set method /
- rGFM
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