水下爆炸多气泡耦合形态及载荷分布特性
Coupling shape and load distribution characteristics of underwater explosion multi-bubble
谢洋洋 1孙岩1
作者信息
- 1. 青岛哈尔滨工程大学 创新发展中心,山东 青岛 266000
- 折叠
摘要
多爆源水下爆炸产生的气泡在相互耦合作用后,其形态演化以及脉动载荷分布特性与单个气泡相比存在着显著差异.基于超算工作站,由LS-DYNA有限元软件,建立了自由场中爆源中心距离为一个气泡最大半径R的三气泡及四气泡水平阵列三维模型,使用ALE算法计算分析了多气泡融合发展形态演变过程和融合气泡空间载荷分布情况.研究表明,多气泡融合后射流发生在气泡水平两端;融合气泡局部坍塌的不一致造成了三气泡融合气泡上方坍塌载荷较四气泡融合气泡坍塌载荷大,但是三气泡融合气泡总冲量始终小于四气泡融合气泡;对比单气泡,多气泡脉动周期增大,三气泡、四气泡第1 次脉动周期与单气泡比值分别为 137%、147%;多气泡脉动载荷显著增强,三气泡、四气泡中心上方距离R处脉动载荷峰值与单气泡同样位置处的脉动载荷峰值比值分别为400%、263%.
Abstract
Compared with single bubble,there are significant differences in the shape evolution and fluctuating load distribution of bubbles produced by underwater explosion with multiple sources.Based on supercomputer workstation and Ls-dyna finite element software,a three-dimensional model of three-bubble and four-bubble horizontal array with the center distance of explosion source in free field being a bubble maximum radius R is established,the evolution process of multi-bubble fusion and the spatial load distribution of multi-bubble fusion are analyzed by ALE algorithm.The results show that the jet flow occurs at both ends of the bubble after multi-bubble fusion,and the local collapse discordance of the bubble causes the collapse load above the three-bubble fusion bubble to be larger than that above the four-bubble fusion bubble,however,the total impulse of three-bubble fusion is always less than that of four-bubble fusion.Compared with a single bubble,the pulsation period of multiple bubbles increases,and the ratios of the first pulsation period of the three-bubble and four-bubble to the single bubble are 137%and 147%,respectively.The load of multiple bubbles is significantly enhanced,and the ratios of the pulsation load peak value at a distance of R above the center of the three-bubble and four-bubble to that of the pulsation load peak value at the same position of the single bubble are 400%and 263%,respectively.
关键词
水下爆炸/融合气泡/气泡脉动/载荷分布特性/数值仿真Key words
underwater explosion/fusing bubbles/bubble pulsation/load distribution characteristics/numerical simulation引用本文复制引用
基金项目
国家自然科学基金项目(52001094)
中央高校基本科研业务费专项资金项目(3072022JC2603)
出版年
2024
NETL
NSTL
万方数据