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.

中文翻译：

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平面激波与嵌入蒸汽腔的水滴的相互作用

首次在激波管中实验研究了激波与嵌入蒸汽腔的水滴的相互作用。液滴内部的蒸气腔是通过将周围压力降低到饱和压力而产生的，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空腔坍塌阶段在液滴内部形成横向射流。不久之后，在液滴的下游极点，在空腔膨胀阶段观察到水射流渗透到周围的空气中。液滴的演化受蒸汽腔演化的强烈影响。相变过程在蒸汽腔演化中起着重要作用。定量地呈现了空腔的相对尺寸和偏心度对液滴运动和变形的影响。