截锥型弹体小角度入水空泡及冲击载荷特性实验研究  

Experimental study on cavity dynamics and impact load of shallow angle water entry of truncated-cone projectile

作　　者：隋宇彤 李帅[1] 明付仁[1] Yu-tong Sui;Shuai Li;Fu-ren Ming(College of Shipbuilding Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]哈尔滨工程大学船舶工程学院,哈尔滨150001

出　　处：《水动力学研究与进展（A辑）》2022年第6期861-866,共6页Chinese Journal of Hydrodynamics

基　　金：黑龙江省自然科学基金优秀青年项目(YQ2022E017);中央高校基本业务费(3072020CFJ0105)

摘　　要：导弹和鱼雷等武器头型对入水冲击载荷和水下弹道特性有重要的影响,该文通过实验方法研究了截锥型弹体小角度入水问题,采用高速摄像机和弹体内置加速度采集仪,探究了截锥型弹体头型系数和入水角度对弹体入水初期空泡演化和冲击加速度特性的影响规律。实验结果表明,不同头型系数下弹体头部可能引导两类空泡:(1)由头部平面和弹体肩部引发的两个初始空泡融合为一个连续的空泡,(2)两个初始空泡单独发展并且不会发生融合。对于第二类空泡,头部平面产生空泡的闭合发生在弹头侧面,并且其闭合时间随入水角度减小而增大。对于弹体的冲击加速度,与产生第一类空泡的弹体相比,产生第二类空泡弹体的冲击加速度增长速率较为缓慢但波形更复杂,并且其加速度达到峰值后,不会立刻下降而是继续持续了一段时间。此外,弹体冲击加速度的上升速率和峰值随入水角度的减小而减小。The nose shape have great influence on the impact load and trajectory of the water entry of the torpedo,missile,etc..In the paper,the shallow angle water entry experiments of the truncated-cone projectiles are conducted.The effects of the nose parameters and impact angle on the water entry are considered.A high-speed camera and an acceleration acquisition system are used to obtain the cavity dynamics and acceleration characteristics,respectively.Results present that the evolution of the two initial cavities that induced by the leading plane and the shoulder are affected by the nose parameters.The cavity dynamics can be divided into two regimes.In the first regime,the two cavities coalesce into a single cavity.In the second regime,the two initial cavities expand independently.The closure and collapse of the first cavity occur on the side of the nose in the later stage.The closure time is increased with decreasing the impact angle.And also the transient impact acceleration is studied,which mainly dependents on the evolution of the wetted area on the nose.The impact acceleration that companies the second category of cavity is unstable,and the growth process is more complicated,compared with the first category of the cavity.The maximum and growth of the impact acceleration are decreased with decreasing the impact angle.

关 键 词：入水 冲击加速度 空泡 高速摄影 

分 类 号：O35[理学—流体力学]