曲面固壁附近空化泡溃灭动力学的 流体体积数值研究*

流体体积法(VOF)可以便捷、高效地实现对多相流界面的捕捉和追踪。本文基于VOF方法，对单个空化泡在曲面固壁附近的运动进行了数值模拟，从实验对比、压力场、速度场、温度场演化、溃灭时间、射流速度、固壁温度等方面分析了空化泡溃灭过程的热动力学影响。结果表明，数值模拟得到的空化泡形态演化与实验观测到的现象一致，随着位置参数、泡内外压差及曲面固壁尺寸的改变，空化泡热动力学行为也将发生变化，受到流体运动及射流冲击的影响，溃灭瞬间产生的高温高压使得曲面固壁温度升高。本文研究的曲面固壁附近空化泡溃灭效应，揭示了空化泡与曲面固壁间的相互作用规律，对学术研究及工程应用都具有重要意义。

Numerical study of cavitation bubble collapse dynamics near a curved wall by the volume of fluid method

The Volume of Fluid (VOF) method can capture and track the interface of multiphase flow conveniently and efficiently. It can be used to study the thermal dynamic characteristics of cavitation bubble collapse near the curved solid wall. Based on the VOF method, the motion of a single cavitation bubble near the curved solid wall is numerically simulated. The thermodynamic effects of cavitation bubble collapse process are analyzed from variation aspects, such as the experimental comparison, pressure field, velocity field, temperature field, collapse time, jet velocity and solid wall temperature. The results show that the thermodynamic behavior of the cavitation bubbles is affected by adjusting the position parameters, the pressure difference between the inside and outside of the bubble and the size of the curved solid wall. Under the influence of fluid motion and jet impingement, the high temperature and pressure generated at the moment of cavitation bubble collapsing increases the temperature of curved solid wall. The collapse effect of cavitation bubble near the curved solid wall studied in this paper reveals the interaction between the cavitation bubble and the curved solid wall, which is of great significance for academic research and engineering application.