Interaction of a planar shock wave and a water droplet embedded with a vapour cavity
Interaction of a planar shock wave and a water droplet embedded with a vapour cavity
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平面冲击波与嵌入蒸汽腔的水滴的相互作用
DOI：
10.1017/jfm.2019.1031
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发表时间：
2020-01
影响因子：
3.7
通讯作者：
Yao Liu
中科院分区：
文献类型：
--
作者：
Yu Liang;Yazhong Jiang;Chih-Yung Wen;Yao Liu
本文首次在激波管中实验研究了含汽腔的水滴与激波的相互作用。通过将周围压力降低到饱和压力来产生液滴内部的蒸汽腔，并且在液滴内部获得液相和气相之间的平衡。采用直接高速摄影来捕捉液滴和蒸汽腔的演变。可以清楚地观察到在腔塌陷阶段液滴内部横向射流的形成。不久之后，在液滴的下游极点，在空腔膨胀阶段观察到穿透到周围空气中的水射流。液滴的演化强烈地受蒸汽空腔的演化的影响。相变过程在汽泡演化过程中起着重要作用。定量地给出了凹腔相对尺寸和偏心率对液滴运动和变形的影响。
The interaction of a shock wave and a water droplet embedded with a vapour cavity is experimentally investigated in a shock tube for the first time. The vapour cavity inside the droplet is generated by decreasing the surrounding pressure to the saturation pressure, and an equilibrium between the liquid phase and the gas phase is obtained inside the droplet. Direct high-speed photography is adopted to capture the evolution of both the droplet and the vapour cavity. The formation of a transverse jet inside the droplet during the cavity-collapse stage is clearly observed. Soon afterwards, at the downstream pole of the droplet, a water jet penetrating into the surrounding air is observed during the cavity-expansion stage. The evolution of the droplet is strongly influenced by the evolution of the vapour cavity. The phase change process plays an important role in vapour cavity evolution. The effects of the relative size and eccentricity of the cavity on the movement and deformation of the droplet are presented quantitatively.
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通讯作者：
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