| 李利剑,张敏弟,王占莹,黄彪,刘思华,谭镇坤.入水角度对球体高速入水空泡特性影响研究[J].装备环境工程,2023,20(3):1-14. LI Li-jian,ZHANG Min-di,WANG Zhan-ying,HUANG Biao,LIU Si-hua,TAN Zhen-kun.Effects of Water Entry Angle on Cavity Characteristics of High-speed Sphere[J].Equipment Environmental Engineering,2023,20(3):1-14. |
| 入水角度对球体高速入水空泡特性影响研究 |
| Effects of Water Entry Angle on Cavity Characteristics of High-speed Sphere |
| |
| DOI：10.7643/issn.1672-9242.2023.03.001 |
| 中文关键词: 入水空泡 球体 入水角度 高速入水 运动特性 入水冲击中图分类号:TJ6 文献标识码:A 文章编号:1672-9242(2023)03-0001-14 |
| 英文关键词:cavity of water entry sphere water entry angle high-speed water entry motion characteristics impact of water entry |
| 基金项目:国家自然科学基金(51979003) |
|
|
| Author | Institution |
| LI Li-jian | School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China |
| ZHANG Min-di | School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China |
| WANG Zhan-ying | Beijing Institute of Astronautical System Engineering, Beijing 100076, China |
| HUANG Biao | School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China |
| LIU Si-hua | School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China |
| TAN Zhen-kun | School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China |
|
| 摘要点击次数: |
| 全文下载次数: |
| 中文摘要: |
| 目的 针对球体高速入水过程中空泡的演化过程及运动特性展开研究，为弹体入水或空投鱼雷入水提供理论参考。方法 基于试验与数值模拟，主要讨论入水角度对球体高速入水过程中空泡生成、闭合、溃灭以及运动特性。结果 在球体入水过程中，根据入水空泡的形态特征，可以将入水过程分为入水冲击、空泡形成、空泡闭合和空泡溃灭4个阶段。在入水冲击阶段，球体头部承受的压力最大，且随着入水角度的减小，冲击阶段球体头部压力逐渐减小。在空泡闭合后，空泡的截面面积随着入水角度的增大而减小。在溃灭阶段，由于空泡溃灭夹断，会产生回射流，回射流的强度随着入水角度的减小而减小。在球体入水角度为30°时，溃灭夹断不会产生回射流。此外，球体以不同角度入水时，球体在水下的运动轨迹会发生不同程度的偏离，偏离程度随着入水角度的增大而减小，垂直入水时几乎未发生偏离。结论 入水角度对球体高速入水过程中空泡的演化过程及运动特性有较大影响，入水角度越小，球体入水后空泡截面积越大，总流动阻力系数Cd越大，且球体运动轨迹偏离越严重。 |
| 英文摘要: |
| The work aims to study the evolution and motion characteristics of cavity during the high-speed water entry process of the sphere to provide theoretical reference for projectile entering water or dropping torpedo into water. Based on the experimental and numerical simulation, the formation, closure, collapse of cavity and motion characteristics of sphere during the water entry process of sphere were discussed. The results showed that according to the morphological characteristics of the cavity, there were four stages of cavity developing process, namely water-entry impact, cavity formation, cavity closure and cavity collapse. During water entry impact, the pressure at the spherical head was the maximum. With the decrease of the water entry angle, the pressure of the spherical head decreased gradually. After closure of cavity, the cross-section area of the cavity decreased with the increase of the water entry angle. In the collapsing stage, a reentrant jet was generated due to the cavity clamping and the strength of the reentrant jet decreased with the decrease of the water entry angle. Especially, a reentrant jet did not occur under 30° of water entry angle. Moreover, there was deflection of the underwater spherical trajectory when the sphere entered water at different angles. And the degree of deflection decreased with the increase of the water entry angle. When the sphere entered water vertically, there was no deflection. It is concluded that the water entry angle has great effect on the evolution process and motion characteristics of cavity in the process of high-speed water entry. The smaller the water entry angle is, the larger the cross-section area of cavity after water entry, the larger the total flow drag coefficient Cd, and the more serious the deflection of the sphere’s motion trajectory. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
