减压条件下深水圆柱附近气泡的运动特性

为深入探究气泡与附近潜艇的相互作用规律,采用电火花气泡发生装置与高速摄像分析系统,在减压环境中对近似潜艇的深水圆柱周围不同位置的气泡进行研究。并以气泡通过圆柱结构中心的铅垂线为界的分类情况讨论深水圆柱周围气泡的动态变化。实验结果表明：圆柱结构附近的气泡的运动主要取决于气泡与圆柱结构间相对的攻角以及气泡质心到就近圆柱壁面的无量纲距离这两种因素的影响。在此基础上同时考虑减压环境中浮力的因素分析了浮力参数及攻角和爆距半径比对气泡第一周期运动时间和位移的影响,并总结圆柱下侧气泡不同爆距半径比下射流宽度的作用范围变化规律。研究结论为圆柱状的潜艇结构在水下受到攻击时的毁伤状态提供了参考。

Study on Dynamic Behavior of Bubble around Deep Water Cylindrical Structure under Hypobaric Condition

In order to research the interaction between bubbles and nearby submarines structure, the spark bubble generator and high-speed camera analysis system were used to study the bubbles in different positions around a deep-water cylinder approximating a submarine in the environment under reduced air pressure. The dynamic changes of bubbles around a deep-water cylinder are discussed by classifying bubbles through the plumb line at the center of the cylinder structure. The experimental results show that the motion of bubbles near the cylindrical structure depends mainly on the relative angle of attack between the bubbles and the cylindrical structure and the dimensionless distance from the center of mass of the bubbles to the near cylindrical wall. On this basis, we consider the buoyancy factors under hypobaric condition, and then analyze the influence of buoyancy parameters, angle of attack and ratio of maximum bubble radius to explosion distance on the first oscillation period time and displacement of bubbles. We also summarize the variation of jet width under different radius ratios of bubble detonation distances on the lower side of the cylinder. The research results provide a reference for the damage status of cylindrical submarine structures when attacked underwater.