物体出水和入水动力学的实验研究

doi:10.3969/j.issn.0253-2778.2015.06.007

中国科学技术大学学报 ›› 2015, Vol. 45 ›› Issue (6): 470-475.DOI: 10.3969/j.issn.0253-2778.2015.06.007

• 论著 • 上一篇

物体出水和入水动力学的实验研究

施红辉，高聚瑞，贾会霞，陈波，周杨洁

浙江理工大学机械与自动控制学院，浙江杭州 310018

收稿日期:2014-09-23 修回日期:2015-03-15 接受日期:2015-03-15 出版日期:2015-03-15 发布日期:2015-03-15
通讯作者: 施红辉
作者简介:施红辉(通讯作者)，男，1962年生，博士/教授. 研究方向：流体力学、超高速碰撞、气泡动力学. E-mail: hhshi@zstu.edu.cn
基金资助:
浙江省自然科学基金(LQ13A020005，LQ13A020006, Z1110123)资助.

Experimental research on the hydrodynamic processes of water exit and entry

SHI Honghui, GAO Jurui, JIA Huixia, CHEN Bo, ZHOU Yangjie

College of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China

Received:2014-09-23 Revised:2015-03-15 Accepted:2015-03-15 Online:2015-03-15 Published:2015-03-15

摘要/Abstract

摘要： 用射钉枪和一级轻气炮对高速物体(细长体)出入水时的超空泡流动现象进行了实验研究，并用高速摄影仪拍摄了相关流场.研究表明，由气泡组成的超空泡尾部的尾涡呈周期性脱落.在出水过程中，物体的速度总体上是在减小的；但是在出水后，如果水花喷溅到物体尾部，物体会获得一定程度的短暂加速.在入水过程中，物体与空泡壁面的碰撞以及非对称性空泡脱落，会导致水下物体的弹道发生变化.根据实验结果，测量了入水后物体的阻力系数Cd，Cd≈07~12.

关键词: 超空泡, 高速物体出入水, 高速摄影, 水弹道

Abstract: Using a pneumatic gun and a single stage light gas gun, the supercavitation phenomena during water entry and exit of high-speed bodies (slender bodies) were investigated experimentally. The flow fields were visualized by a high speed camera. The study shows that the trailing vortices consisting of small bubbles shed periodically behind a supercavity. During water exit, the bodies velocities decrease generally, but a short acceleration may occur when the water splash impacts on the bottom of the body. During water entry, the hydroballistics of the underwater body may change due to the asymmetric bubble shedding behind the body and the collision between the body and the cavitys wall. According to experimental results, the drag coefficient in water Cd was measured, and Cd≈07~12.

Key words: supercavitation, high-speed water exit and water entry, high speed photography, hydroballistics

中图分类号:

O352

施红辉，高聚瑞，贾会霞，陈波，周杨洁. 物体出水和入水动力学的实验研究[J]. 中国科学技术大学学报, 2015, 45(6): 470-475.

SHI Honghui, GAO Jurui, JIA Huixia, CHEN Bo, ZHOU Yangjie. Experimental research on the hydrodynamic processes of water exit and entry[J]. Journal of University of Science and Technology of China, 2015, 45(6): 470-475.

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物体出水和入水动力学的实验研究

Experimental research on the hydrodynamic processes of water exit and entry

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