Wang Xiaoyu, Hu Jingrong, Wang Yufei, Zhang Yuning, Zhang Yuning
Key Laboratory of Power Station Energy Transfer Conversion and System (Ministry of Education), School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China.
College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing 102249, China; Beijing Key Laboratory of Process Fluid Filtration and Separation, China University of Petroleum-Beijing, Beijing 102249, China.
Ultrason Sonochem. 2025 Jan;112:107169. doi: 10.1016/j.ultsonch.2024.107169. Epub 2024 Nov 19.
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.
多个颗粒与空化气泡的联合作用会严重损坏水力机械。结合开尔文冲量理论和高速摄影实验结果，本文研究了位于三个等尺寸球形颗粒之间的单个气泡的动力学行为。描述了气泡溃灭阶段的非球形形态演变特征。定量分析了三个颗粒的排列对气泡迁移方向和强度的影响。在此基础上，探索了开尔文冲量等于零的零冲量点的空间分布特征。结果表明：(1) 当气泡在对称位置诱发时，根据气泡形态总结出三种典型的溃灭特征情况，包括V形、T形和银杏叶形。(2) 当气泡初始位置在对称轴上移动时，开尔文冲量强度呈现非单调趋势，其方向多次变化。冲量强度和方向均受颗粒排列的显著影响。(3) 三个颗粒之间存在多个零冲量点，零冲量点的空间位置和数量均受颗粒排列的影响。
