壁面与自由液面联合作用下气泡动态特性实验研究

摘要

壁面与自由液面联合作用下,气泡的动态特性与单独一个边界条件作用时相比要复杂很多,难于从理论角度分析探讨.为深入探究壁面与自由液面联合作用下的气泡动态特性,采用安全性高且实验效果理想的200 V直流电压电火花气泡发生装置生成气泡,依次改变气泡发生位置距壁面及自由液面的距离,同时采用高速运动分析系统对不同工况下的实验结果进行采集与分析,得到了壁面与自由液面联合作用下的气泡形态变化,同时通过对大量实验数据的总结归纳,得到壁面与自由液面联合作用对气泡脉动周期、迁移轨迹及气泡内射流方向的影响规律,从而为相关的理论与数值研究提供参考.%Under combined action of wall and free surface,a bubble shows more complex pulse features than those under boundary conditions of either single wall or single free surface.It is hard to analyze them theoretically.In order to study the bubble pulse features under the combined action of wall and free surface,an electric circuit with 200V was designed to generate discharge bubbles and the distances from bubble center to wall and free surface were changed in turn.An analysis system for high-speed motion was used to collect and analyze the experimental results under different working conditions.The bubble shape variation under the combined action of wall and free surface was investigated.Based on a large amount of experimental data,the influences of the combined action of wall and free surface on the bubble pulse period,the bubble moving trace and its inside jet direction were concluded,they provided a reference for relevant theoretical and numerical studies.