细长体高速入水过程压力特性试验研究  

Experimental study on the pressure characteristic of high-speed slender body water entry

作　　者：时素果[1] 杨晓光[1] 王亚东[1] 刘乐华[1] 

机构地区：[1]北京机电工程研究所,北京100074

出　　处：《应用力学学报》2018年第2期223-227,共5页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(11602260)

摘　　要：为了研究高速入水过程物体表面压力特性,对细长体高速入水过程进行了试验研究。试验在水池中开展,采用高速摄影的方法观察入水过程空泡形态演化规律,采用压力传感器测量物体表面压力,获得了细长体高速入水过程中空泡形态和表面压力变化规律。试验结果表明:在高速入水过程中,随着入水深度增加,泡内压力先降低后升高之后再次降低,压力升高主要是因为空泡闭合泡内气体受到压缩,之后降低则是因为闭合空泡泄气等原因;细长体尾部在入水过程中,上方始终处于空泡内,压力与稳定空泡内压力变化一致,下方在触水瞬间会产生一压力高峰;同时,随着速度增大,入水过程空泡内压力降低最大,空泡内部压强最低值随着速度的增加呈线性减小趋势。In order to investigate the surface pressure characteristic of high-speed water entry, the slender body high-speed water entry is studied experimentally. The experiment is applied in a pool, a high-speed video camera is used to visualize the cavity of the high-speed water entry, the pressure sensor is employed to measure the surface pressure of the slender body, the caivity shape and the surface pressure are acquired. The experimental results show that, in the process of high-speed water entry, with the increase of water entry depth, the pressure in the bubble decreases first and then increases and then decreases again. The main reason for the increase of pressure is that the air in the bubble is compressed, and then the reduction is due to the closure of cavitation and other reasons. During the process of a slender tail into the water, the top is always inside the cavity, the pressure is consistent with the pressure change in the stable cavity, at the end there is a pressure peak at the moment of touching the water. At the same time, as the speed increases, the pressure in the cavitation is the largest in the process of entering the water, the minimum internal pressure of the cavitation is linearly decreasing with the increase of velocity.

关 键 词：高速入水 压力 空泡 速度 试验 

分 类 号：TJ630[兵器科学与技术—武器系统与运用工程]