近壁面气泡的运动规律研究

基于势流假设，建立气泡与壁面耦合数值模型，运用边界积分法求解，并开发三维计算程序，计算值与实验值符合很好.从气泡与壁面相互作用的基本现象入手，基于开发的程序系统地研究了刚性壁面附近气泡的动力学特性，其中包括水平壁面及倾斜壁面，研究壁面的Bjerknes效应与各特征参数之间的关系，并将各种工况的计算结果与基于Kelvin-impulse理论的Blake准则进行对比分析讨论，得出偏射流方向及壁面压力与气泡的特征参数有密切的关系，同时给出了Blake准则的适用范围.旨在为相关的近壁面气泡动态特性研究提供参考. 关键词： 气泡 壁面 边界积分 Bjerknes效应

The law of the bubble motion near the wall

Based on the assumption of potential flow, the coupled numerical model of the bubble and the wall is created and it is calculated with boundary integral method and a three-dimensional computing program is developed. The calculated result agrees with the experimental result well. Starting with the basic phenomenon of the interaction between the bubble and the wall, the dynamics of the bubble near a rigid wall is studied systematically with the program developed in this paper, including both cases of the parallel wall and the oblique wall. The relation between Bjerknes effect of the wall and the characteristic parameters is studied and the calculated results of various cases are compared and discussed with the Blake criterion based on the Kelvin-impulse theory. The analysis shows that the jet direction and the pressure on the rigid wall have close relationship with the bubble's characteristic parameters. Besides, the application range of Blake criterion is given. This paper aims to provide reference for the relevant researches on the dynamics of bubble near the wall.