The combined action of multiple particles and cavitation bubbles can severely damage hydraulic machinery. Combining the Kelvin impulse theory and the results of high-speed photography experiments, this paper researches the dynamic behaviors of a single bubble located between three equal-sized spherical particles. Non-spherical morphological evolution characteristics in the collapse stage of the bubble are described. The influence of the arrangement of the three particles on the direction and intensity of the bubble migration is quantitatively analyzed. On this basis, the spatial distribution characteristics of the zero impulse points with the Kelvin impulse equal to zero are explored. The results show that: (1) As the bubble is induced in the symmetric positions, three typical cases of collapse characteristics are summarized according to the bubble morphology, including V-shaped, T-shaped, and ginkgo leaf-shaped. (2) As the bubble incipient position is shifted on the symmetry axis, the Kelvin impulse intensity shows a non-monotonic trend with its direction varying many times. Both the impulse intensity and direction are significantly affected by the arrangement of particles. (3) There are multiple zero impulse points among the three particles, and both the spatial location and the number of the zero impulse points are affected by the arrangement of the particles.

中文翻译：

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多粒子间空化泡坍缩动力学特性研究


多个颗粒和气蚀气泡的共同作用会严重损坏液压机械。结合开尔文脉冲理论和高速摄影实验的结果，本文研究了位于三个大小相等的球形粒子之间的单个气泡的动力学行为。描述了气泡坍缩阶段的非球形形态演化特征。定量分析了三种颗粒的排列对气泡迁移方向和强度的影响。在此基础上，探究了开尔文脉冲等于零的零脉冲点的空间分布特征。结果表明：（1）由于气泡在对称位置被诱导，根据气泡形态总结出3种典型的塌陷特征，包括V形、T形和银杏叶状。（2） 当气泡初期位置在对称轴上移动时，开尔文脉冲强度呈现非单调趋势，其方向变化多次。脉冲强度和方向都受粒子排列的显著影响。（3） 三个粒子之间有多个零冲量点，零冲量点的空间位置和数量都受粒子排列方式的影响。