不同头型弹丸低速垂直入水实验研究  

Experimental Study of Low Speed Vertical Water Entry with Different Head Shape Projectiles

作　　者：王瑞琦[1] 黄振贵[1] 郭则庆[1] 陈志华[1] 高建国[1] 侯宇 

机构地区：[1]南京理工大学瞬态物理国家重点实验室,南京210094

出　　处：《兵器装备工程学报》2017年第11期45-50,共6页Journal of Ordnance Equipment Engineering

基　　金：国防预先研究基金项目(61426040303162604004);中央高校基本科研业务费专项资金项目(30917012101)

摘　　要：用高速摄像机记录了平头、90°锥头、圆头、截锥体头弹丸入水过程中空泡的演变过程,比较分析了4种弹丸的入水空泡形态和空泡的闭合方式。结果表明,在垂直入水速度为2.8 m/s时,90°锥头、圆头、截锥体头弹丸入水后空泡均发生深闭合,其中90°锥头弹丸入水空泡最大,截锥体头型弹丸次之,圆头弹丸入水空泡最小,而平头弹丸入水后空泡发生了类面闭合;随着弹丸入水速度的增加,空泡分别发生准静态闭合、浅闭合、深闭合、表面闭合和类面闭合;在闭合点位置以上,空泡最大直径随水深的增加逐渐变小,而在闭合点位置以下,不同水深位置空泡最大直径保持在14.5 mm左右。Experimental studies of the vertical water entry with flat head, 90° cone-shaped head, elliptical head and cut-cone head projectiles were conducted in high-speed camera to capture the cavity-running phase. The cavity shapes of four projectiles and the cavity pinch-off types were analyzed. Experiment results show that when the water entry speed is 2.8 m/s, the 90° cone-shaped head, elliptical head and cut-cone head projectiles enter into the water, the deep seal phenomenon occurs, but the liken-surface seal occurs when the flat head projectile enters the water, With the increase of water entry velocity, quasi-static seal, shallow seal, deep seal, surface seal and liken-surface seal are observed. At the position above the pinch-off point, the maximum diameter of the cavity at each depth gradually decrease with depth, but the maximum diameter of the cavity at each depth is about 14.5 mm below the pinch-off point.

关 键 词：不同头型弹丸 垂直入水 空泡闭合方式 空泡最大直径 

分 类 号：O359.1[理学—流体力学] TJ011.2[理学—力学]