水下管口附近脉动气泡溃灭及射流特性实验和数值研究

doi:10.16183/j.cnki.jsjtu.2023.118

上海交通大学学报 ›› 2025, Vol. 59 ›› Issue (1): 99-110.doi: 10.16183/j.cnki.jsjtu.2023.118

水下管口附近脉动气泡溃灭及射流特性实验和数值研究

张越尧^a, 乔峰^a, 吕详^a, 张天源^b, 韩蕊^a(), 李帅^b

哈尔滨工程大学 a. 核科学与技术学院; b. 船舶工程学院,哈尔滨 150001

收稿日期:2023-04-03 修回日期:2023-05-18 接受日期:2023-06-29 出版日期:2025-01-28 发布日期:2025-02-06
通讯作者: 韩蕊,副教授; E-mail: hanrui@hrbeu.edu.cn.
作者简介:张越尧(2002—),本科生,从事气泡动力学研究.
基金资助:
国家自然科学基金(12072087);黑龙江省自然科学基金(YQ2022E017);国家级大学生创新创业训练计划(202210217185)

Pulsating Bubble Collapse and Jet Characteristics Near the Nozzle of Underwater Tube

ZHANG Yueyao^a, QIAO Feng^a, LÜ Xiang^a, ZHANG Tianyuan^b, HAN Rui^a(), LI Shuai^b

a. College of Nuclear Science and Technology; b. College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China

Received:2023-04-03 Revised:2023-05-18 Accepted:2023-06-29 Online:2025-01-28 Published:2025-02-06

摘要/Abstract

摘要：

通过实验和数值方法研究水下管口附近脉动气泡溃灭及射流特性.在实验方面,采用电火花放电技术产生厘米级脉动气泡,并利用高速摄影捕捉气泡的瞬态动力学行为;在数值方面,采用基于势流理论的边界积分方法模拟气泡与管壁的耦合作用.实验发现,脉动气泡在管口附近溃灭过程中会产生指向管内的射流,进而威胁水中管道设备的结构安全,数值模拟结果和实验现象吻合良好.通过对气泡距管口距离与管口半径之比γ和气泡的最大半径与管口半径之比λ两个无量纲参数进行系统研究发现:当γ≤1.5时,气泡溃灭阶段只会产生指向管内的射流,当γ>1.5时,气泡产生指向管内射流的趋势随λ的增加而增加;总体而言,气泡产生向下射流的速度随λ的增加而增加,随γ的增大先增大后减小.当γ<0时,射流速度随λ和γ的变化很小,但射流宽度随两者的增加而增加;当γ>0时,射流速度随γ的增大先增大后减小.研究结论为水下管口附近气泡溃灭的动力学行为提供了重要参考.

关键词: 气泡动力学, 近管口气泡, 边界积分法, 高速摄影

Abstract:

In this paper, the characteristics of a pulsating bubble collapse near the nozzle of an underwater tube were investigated both experimentally and numerically. The experiments involved generating pulsating bubbles using the electric spark discharge technology and capturing their transient behavior by high-speed photography. A boundary integral method based on potential flow theory was used to simulate the coupling between the bubble and the tube in the numerical simulation. The results show that the collapsing bubble can produce a jet directed towards the tube, which poses a safety threat to the pipeline equipment. The numerical simulation results and experimental phenomena are in good agreement. In addition, a systematic study was conducted of two dimensionless parameters, i.e., the ratio of bubble distance from the tube nozzle and the tube nozzle radius γ and the ratio of the maximum radius of the bubble and the tube nozzle radius λ. The findings indicate that when γ≤1.5, bubbles will only produce jets pointing into the tube during the collapse phase, and when γ>1.5, the tendency for bubbles to produce jets pointing into the tube increases as λ increases. Moreover, the maximum velocity of the downward jet increases with the increase of λ, and increases and then decreases with the increase of γ. Additionally, the maximum velocity of the downward jet generally increases with the increase of λ and increases and then decreases with the increase of γ. This study provides valuable insights into the dynamic behavior of bubble collapse near the nozzle of a submerged tube, which can provide safety measures for pipeline equipment.

Key words: bubble dynamics, bubbles near the nozzle of the tube, boundary integral method, high-speed photography

中图分类号:

O358

张越尧, 乔峰, 吕详, 张天源, 韩蕊, 李帅. 水下管口附近脉动气泡溃灭及射流特性实验和数值研究[J]. 上海交通大学学报, 2025, 59(1): 99-110.

ZHANG Yueyao, QIAO Feng, LÜ Xiang, ZHANG Tianyuan, HAN Rui, LI Shuai. Pulsating Bubble Collapse and Jet Characteristics Near the Nozzle of Underwater Tube[J]. Journal of Shanghai Jiao Tong University, 2025, 59(1): 99-110.

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水下管口附近脉动气泡溃灭及射流特性实验和数值研究

Pulsating Bubble Collapse and Jet Characteristics Near the Nozzle of Underwater Tube

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