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水中高压脉动气泡水射流形成机理及载荷特性研究

李帅 张阿漫 韩蕊

李帅, 张阿漫, 韩蕊. 水中高压脉动气泡水射流形成机理及载荷特性研究[J]. 力学学报, 2019, 51(6): 1666-1681. doi: 10.6052/0459-1879-19-219
引用本文: 李帅, 张阿漫, 韩蕊. 水中高压脉动气泡水射流形成机理及载荷特性研究[J]. 力学学报, 2019, 51(6): 1666-1681. doi: 10.6052/0459-1879-19-219
Li Shuai, Zhang Aman, Han Rui. THE MECHANISM OF JETTING BEHAVIORS OF AN OSCILLATING BUBBLE[J]. Chinese Journal of Theoretical and Applied Mechanics, 2019, 51(6): 1666-1681. doi: 10.6052/0459-1879-19-219
Citation: Li Shuai, Zhang Aman, Han Rui. THE MECHANISM OF JETTING BEHAVIORS OF AN OSCILLATING BUBBLE[J]. Chinese Journal of Theoretical and Applied Mechanics, 2019, 51(6): 1666-1681. doi: 10.6052/0459-1879-19-219

水中高压脉动气泡水射流形成机理及载荷特性研究

doi: 10.6052/0459-1879-19-219
基金项目: 1) 国家自然科学基金资助项目(51709056);国家自然科学基金资助项目(11702071)
详细信息
    通讯作者:

    李帅

  • 中图分类号: O358

THE MECHANISM OF JETTING BEHAVIORS OF AN OSCILLATING BUBBLE

  • 摘要: 具有脉动特性的气泡(如水下爆炸气泡、螺旋桨空泡和气枪气泡)动力学行为很大程度上取决于其边界条件. 实验已证实,近自由液面气泡在坍塌过程中常常产生背离自由液面的水射流现象,而近刚性边界气泡在坍塌阶段产生朝向壁面的高速水射流,严重威胁水中结构的局部强度. 前人基于 Rayleigh-Plesset 气泡理论和 “Bjerknes” 力来预测气泡射流方向,然而理论方法难以透彻的揭示气泡射流的初生、发展和砰击过程中丰富的力学机理. 本文首先采用水下高压放电技术产生气泡,并通过高速摄影对不同边界条件下气泡的运动特性进行实验研究. 然后,采用边界积分法模拟气泡非球状坍塌过程. 研究表明,边界条件改变了气泡周围的流场压力梯度方向,进而影响气泡射流初生位置;射流在发展阶段,气泡附近流场的局部高压区和射流之间存在“正反馈效应”,从而揭示了气泡射流速度在短时间内即可增加到百米每秒的力学机理. 射流砰击会在流场中造成局部高压区,随着气泡回弹,射流速度和砰击压力逐渐减小. 本文还探讨了无量纲距离参数对气泡运动及射流砰击载荷的影响,旨为近场水下爆炸等相关领域提供参考.

     

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出版历程
  • 收稿日期:  2019-01-11
  • 刊出日期:  2019-11-18

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