On the origins of transverse jet shear layer instability transition

On the origins of transverse jet shear layer instability transition
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横向射流剪切层失稳转变的起源

DOI:
10.1017/jfm.2020.127
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发表时间:
2020
影响因子:
3.7
通讯作者:
Karagozian, Ann R.
Karagozian, Ann R.
中科院分区:
工程技术2区
文献类型:
--
作者:
Shoji, Takeshi;Harris, Elijah W.;Besnard, Andrea;Schein, Stephen G.;Karagozian, Ann R.

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本实验研究探索了横向射流上游剪切层从对流不稳定转变为绝对/全局不稳定的物理机制,即射流与横流动量通量比 ,对于在几个不同射流雷诺数下包含不同物质浓度(氮气、氦气和丙酮蒸气)的射流。这些研究利用了从立体粒子图像测速以及同步立体粒子图像测速和丙酮平面激光诱导荧光成像中提取的实验数据。他们为逆流剪切层类比与喷嘴产生的横向射流中的上游剪切层不稳定转变的相关性提供了实验证据。
This experimental study explores the physical mechanisms by which a transverse jet’s upstream shear layer can transition from being a convective instability to an absolute/global instability as the jet-to-cross-flow momentum flux ratio , for jets containing differing species concentrations (nitrogen, helium and acetone vapour) at several different jet Reynolds numbers. These studies make use of experimental data extracted from stereo particle image velocimetry as well as simultaneous stereo particle image velocimetry and acetone planar laser-induced fluorescence imaging. They provide experimental evidence for the relevance of the counter-current shear layer analogy to upstream shear layer instability transition in a nozzle-generated transverse jet.
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