首页 | 本学科首页   官方微博 | 高级检索  
     检索      

水下强声波脉冲负压的产生和空化气泡运动
引用本文:张军,曾新吾,陈聃,张振福.水下强声波脉冲负压的产生和空化气泡运动[J].物理学报,2012,61(18):184302-184302.
作者姓名:张军  曾新吾  陈聃  张振福
作者单位:1. 国防科技大学光电科学与工程学院,长沙,410073
2. 国防科技大学理学院,长沙,410073
基金项目:国家自然科学基金(批准号: 11274387)资助的课题.
摘    要:首先利用高速摄影和压力传感器测量的方法, 对曲面反射式水下强声波脉冲的传播和聚焦过程进行了实验研究.实验研究发现, 椭球面反射罩在起到汇聚声能的作用的同时也将使得强声波脉冲在传播过程中形成负压区, 并由此而引发近场声传播通道上空化气泡群的产生. 在实验结果的基础上, 进一步利用基于Kirchhoff衍射定理的声传播模型和大振幅条件下的QX气泡运动方程, 对强声波脉冲负压区的形成原因及空化气泡的运动过程进行了数值计算和分析. 研究结果表明, 在焦前区, 源于反射罩内表面的"尾波"和出口处的"边缘波"在传播过程中将形成反射波中的负压区; 在焦后区, 源于反射罩顶点的"中心波"在传播过程中将形成反射波中的负压区. 在反射波作用下, 空化气泡体现出了"正压区受压缩并振荡, 负压区膨胀"的运动特点. 在反射波之后, 空化气泡将出现成长、坍缩和回弹等典型的物理过程. 研究结果对曲面反射式水下强声波传播物理规律的认识具有实际意义.

关 键 词:水下等离子体声源  强声波脉冲  负压  空化气泡运动
收稿时间:2012-04-27

Generation of negative pressure of underwater intensive acoustic pulse and cavitation bubble dynamics
Zhang Jun,Zeng Xin-Wu,Chen Dan,Zhang Zhen-Fu.Generation of negative pressure of underwater intensive acoustic pulse and cavitation bubble dynamics[J].Acta Physica Sinica,2012,61(18):184302-184302.
Authors:Zhang Jun  Zeng Xin-Wu  Chen Dan  Zhang Zhen-Fu
Institution:1. College of Opto-electronics Science and Engineering,, National University of Defense Technology, Changsha 410073, China;2. College of Science, National University of Defense Technology, Changsha 410073, China
Abstract:In this paper, the high speed photography and the pressure measurement are used to study the propagation and focusing process of the underwater intensive acoustic pulse which is reflected from an ellipsoidal reflector. The experimental results indicate that the reflector contribute to both the sound energy focusing and the generation of a negative pressure portion of the intensive acoustic pulse, and the cavitation bubble cluster will be induced to grow accordingly. Based on the experimental results, a sound propagation model derived from Kirchhoff diffraction integral and the equation of bubble dynamics proposed by Qian and Xiao Qian Z W and Xiao L 2003 Chin. Phys. Lett. 20 80; Qian Z W and Xiao L 2008 Chinese Physics B 17 3785] are used to numerically study the propagation of the intensive acoustic pulse and the bubble motion. The numerical results indicate that the "wake wave" and "edge wave" will evolve into the negative pressure portion of the intensive acoustic pulse in front of the far focus of the reflector and the "center wave" will evolve into the negative pressure part beyond the far focus of the reflector. When the bubble is subjected to the reflected wave, it will be compressed and oscillate periodically during the positive pressure phase, and it will expand during the negative pressure phase of the incident pulse. And after the reflected wave passes, the typical processes of expanding, collapsing and rebounding can be seen clearly from the photographs. The research results have practical significance for understanding the propagation characteristic of the underwater intensive acoustic pulse with an ellipsoidal reflector.
Keywords:underwater plasma acoustic source  intensive acoustic pulse  negative pressure  bubble dynamics
本文献已被 CNKI 万方数据 等数据库收录!
点击此处可从《物理学报》浏览原始摘要信息
点击此处可从《物理学报》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号