Effects of aspect ratio on shock-cylinder interaction
Effects of aspect ratio on shock-cylinder interaction
复制标题
长宽比对激波-气缸相互作用的影响
DOI：
10.1007/s10409-018-0819-3
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发表时间：
2018-12
影响因子：
3.5
通讯作者：
Zhai Zhigang
中科院分区：
文献类型：
--
作者：
Ou Junfeng;Zhai Zhigang
研究了平面冲击波与被空气包围的不连续椭圆形气缸的相互作用。特别关注纵横比对波型、界面演变和材料混合的影响。实验中采用皂膜技术制造出理想的不连续二维气瓶，并通过纹影摄影结合高速摄像机捕捉冲击流。气缸表面足够清晰，可以观察冲击运动，清晰的界面边界使我们能够提取更多细节。随着纵横比的变化，冲击聚焦过程也有很大不同。对于长形气缸，虽然首先发生内部激波聚焦，但仍产生向内射流。在无膜长椭圆实验中从未观察到向内射流，可能是因为无膜界面上产生的涡量较少，向内射流非常微弱，难以观察到。对于扁圆形气缸，从下游界面导出了一个在以前的工作中没有明确描述的次级涡对。早期的材料线是从实验中提取的，随着长宽比的增加，材料线增长得更快。计算得出界面面积、平均体积分数和混合速率，结果表明长径比的增加促进了气体之间的混合。
Interaction of a planar shock wave with a discontinuouselliptic gas cylinder surrounded by air is investigated. Special attention is given to the effects of aspect ratio on wave pattern, interface evolution, and material mixing. An ideal discontinuous two-dimensional gas cylinder is created by the soap film technique in experiments, and the shocked flow is captured by schlieren photography combined with a high-speed video camera. The surface of the gas cylinder is clear enough to observe the shock motions, and the distinct interface boundaries allow us to extract more details. As aspect ratio varies, the shock focusing process is quite different. For the prolate gas cylinder, an inward jet is produced although an internal shock focusing firstly occurs. The inward jet has never been observed in membraneless prolate ellipse experiments probably because the inward jet is so faint due to less vorticity generation on membraneless interface that it is difficult to be observed. For the oblate gas cylinder, a secondary vortex pair, which has not been described clearly in previous work, is derived from the downstream interface. The material lines at early stages are extracted from experiments, which grow faster as aspect ratio increases. The interfacial area, the mean volume fraction and the mixing rate are presented from computations, and the results show that the increase of aspect ratio promotes the mixing between gases.
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影响因子：
4.6
作者：
J. Jacobs
通讯作者：
J. Jacobs
影响因子：
3
作者：
RICHTMYER, RD
通讯作者：
RICHTMYER, RD
影响因子：
2.2
作者：
Lindl, John;Landen, Otto;Baxamusa, S. H.
通讯作者：
Baxamusa, S. H.
影响因子：
3.7
作者：
Ding Juchun;Si Ting;Chen Mojun;Zhai Zhigang;Lu Xiyun;Luo Xisheng
通讯作者：
Luo Xisheng
影响因子：
4.1
作者：
Jiang, GS;Shu, CW
通讯作者：
Shu, CW