The collapse of the cavitation bubble near the rigid wall emits shock waves and creates micro-jet, causing cavitation damage and operation instability of the hydraulic machinery. In this paper, the millimeter-scale bubble near the rigid wall was investigated experimentally and numerically with the help of a laser photogrammetry system with nanosecond-micron space-time resolution and the open source package OpenFOAM-2212. The morphological characteristics of the bubble during its growth phase, collapse phase and rebound phase were observed by experiment and numerical simulation, and characteristics of the accompanying phenomena including the shock wave propagation and micro-jet evolution were well elucidated. The numerical results agree well with the experimental data. The bubble starts from a tiny small size with high internal pressure and expands into a sphere with a radius of 1.07 mm for γ = d/R_max = 1.78. The bubble collapses into a heart shape and moves towards to the rigid wall during its collapse phase, resulting in a higher pressure load for the rigid wall in the second collapse. The maximum pressure of the shock wave of the first bubble collapse phase reaches 5.4 MPa, and the velocity of the micro-jet reaches approximately 100 m/s. This study enriches the existing experimental and numerical results of the dynamics of the near-wall cavitation bubble.

刚性壁附近空化泡的溃灭发出冲击波并产生微射流，造成空化破坏和液压机械运行不稳定。本文借助具有纳秒微米时空分辨率的激光摄影测量系统和开源软件包OpenFOAM-2212，对刚性壁附近的毫米级气泡进行了实验和数值研究。通过实验和数值模拟观察了气泡在生长阶段、溃灭阶段和回弹阶段的形态特征，并很好地阐明了冲击波传播和微射流演化等伴随现象的特征。数值结果与实验数据吻合良好。气泡从具有高内部压力的微小尺寸开始，膨胀成半径为 1.07 毫米的球体，其中γ = d / R _max = 1.78。气泡在塌陷阶段塌陷成心形并移向刚性壁，导致第二次塌陷时刚性壁承受更高的压力载荷。第一气泡破裂阶段的冲击波最大压力达到5.4 MPa，微射流速度达到约100 m/s。这项研究丰富了近壁空化气泡动力学的现有实验和数值结果。