To research the dynamics of the cavitation bubble under the interaction of particle clusters, the bubble morphological evolutionary characteristics near three equal-sized spherical particles are theoretically explored in the present study based on the Weiss theorem and the velocity potential superposition theory. The three particles are arranged symmetrically, and the fluid velocity field near the three particles and the cavitation bubble is obtained. Moreover, the effects of the bubble-particle distance and the maximum radius of the cavitation bubble on the fluid velocity are investigated, and the contribution mechanisms of the fluid velocity field constituents are compared. The analysis has found that: (1) The fluid velocity between the bubble and the particle is lower than that at the other locations in both the growth and collapse phases, thus the bubble cannot always maintain a standard spherical shape. (2) The bubble-particle distance and the maximum radius of the cavitation bubble are the key parameters affecting the circumferential inhomogeneity of the radial velocity of the fluid around the bubble. The larger the maximum radius or the smaller the bubble-particle distance is, the more visible the non-circularity of the bubble morphology. (3) The image bubbles and the linear sinks contribute oppositely to the fluid velocity field, and the presence of the image bubble reduces the fluid velocity. In the low velocity region, the image bubble is the main mechanism contributing to the effect of the particle on the fluid velocity.

为了研究颗粒簇相互作用下空化气泡的动力学特征，本研究基于Weiss定理和速度势叠加理论，从理论上探讨了三个等尺寸球形颗粒附近的气泡形态演化特征。三个颗粒对称排列，得到三个颗粒和空化泡附近的流体速度场。此外，还研究了气泡-颗粒距离和空化气泡最大半径对流体速度的影响，并比较了流体速度场成分的贡献机制。分析发现：（1）在生长阶段和破裂阶段，气泡与颗粒之间的流体速度均低于其他位置，因此气泡不能始终保持标准的球形。 (2)气泡-颗粒距离和空化气泡的最大半径是影响气泡周围流体径向速度周向不均匀性的关键参数。最大半径越大或气泡-颗粒距离越小，气泡形态的非圆形性越明显。 (3) 像泡和线性汇对流体速度场的贡献相反，像泡的存在降低了流体速度。在低速区域，像泡是粒子对流体速度影响的主要机制。