阿特伍德数在双层气瓶冲击诱导演化中的作用

IF 4.1 2区 工程技术 Q1 MECHANICS Physics of Fluids Pub Date : 2024-08-09 DOI:10.1063/5.0221371
Xin Li, Jiaao Hao, Chih-Yung Wen, E. Fan
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引用次数: 0

摘要

为了研究界面演变对阿特伍德数的依赖性,我们构建了一个内气缸中含有不同浓度 SF6(体积分数从 5% 到 80% 不等)的 A/B/C 型气缸。当阿特伍德数为负数时,高压三联点与下游界面相互作用,在外圆柱体的下游界面上出现次级涡旋对,同时由于传播的冲击波穿过汇聚点后产生了明显的高压区,从而形成了下游射流。分析了内外圆柱体的宽度和高度,以量化界面的演变。利用涡度传输方程研究了涡度演变背后的机制。引入涡度方程来研究涡度演变的机制。扩张项和巴氏项在涡度产生的动力学过程中起主导作用。通过对现有环流模型进行线性求和,可以预测净环流。对外圆和内圆的面积和平均质量分数历史分析表明,随着阿特伍德数的降低,更多的环境气体稀释了 SF6 并促进了气体混合。
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Role of Atwood number in the shock-induced evolution of a double-layer gas cylinder
An A/B/C-type gas cylinder with various concentrations of SF6 (ranging from 5% to 80% in volume fraction) in the inner cylinder is constructed to investigate the dependence of the interface evolution on the Atwood number. For negative Atwood numbers, secondary vortex pairs emerge at the downstream interface of the outer cylinder following the interaction of a high-pressure triple point with the downstream interface, while a downstream jet is formed due to the generation of a notably higher-pressure zone after the transmitted shock wave traverses the convergence point. The widths and heights of both outer and inner cylinders are analyzed to quantify the interface evolution. The mechanism behind the vorticity evolution is investigated using the vorticity transport equation. The vorticity equation is introduced to investigate the mechanism of vorticity evolution. The dilatation and baroclinic terms play a dominant role in the dynamics of vorticity production. The net circulation can be predicted by linearly summing existing circulation models. Analysis of the area and mean mass fraction histories of the outer and inner cylinders shows that more ambient gas dilutes SF6 and promotes gas mixing as the Atwood number decreases.
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来源期刊
Physics of Fluids
Physics of Fluids 物理-力学
CiteScore
6.50
自引率
41.30%
发文量
2063
审稿时长
2.6 months
期刊介绍: Physics of Fluids (PoF) is a preeminent journal devoted to publishing original theoretical, computational, and experimental contributions to the understanding of the dynamics of gases, liquids, and complex or multiphase fluids. Topics published in PoF are diverse and reflect the most important subjects in fluid dynamics, including, but not limited to: -Acoustics -Aerospace and aeronautical flow -Astrophysical flow -Biofluid mechanics -Cavitation and cavitating flows -Combustion flows -Complex fluids -Compressible flow -Computational fluid dynamics -Contact lines -Continuum mechanics -Convection -Cryogenic flow -Droplets -Electrical and magnetic effects in fluid flow -Foam, bubble, and film mechanics -Flow control -Flow instability and transition -Flow orientation and anisotropy -Flows with other transport phenomena -Flows with complex boundary conditions -Flow visualization -Fluid mechanics -Fluid physical properties -Fluid–structure interactions -Free surface flows -Geophysical flow -Interfacial flow -Knudsen flow -Laminar flow -Liquid crystals -Mathematics of fluids -Micro- and nanofluid mechanics -Mixing -Molecular theory -Nanofluidics -Particulate, multiphase, and granular flow -Processing flows -Relativistic fluid mechanics -Rotating flows -Shock wave phenomena -Soft matter -Stratified flows -Supercritical fluids -Superfluidity -Thermodynamics of flow systems -Transonic flow -Turbulent flow -Viscous and non-Newtonian flow -Viscoelasticity -Vortex dynamics -Waves
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