高速冲头有界入水初始阶段的数值模拟  

Numerical Simulation Of High Speed Body Entry Into Bounded Water

作　　者：易淑群[1] 陈九锡[1] 

机构地区：[1]中国船舶科学研究中心

出　　处：《水动力学研究与进展（A辑）》1996年第2期171-180,共10页Chinese Journal of Hydrodynamics

摘　　要：冲头以高速撞入比它最大外径稍微大一点的盛水容器，在特殊工程中由撞水阻力起到制动作用。本文采用实用的方法处理自由面条件及狭缝两侧的物面条件计算了高速冲头有界入水初始阶段的运动过程。分别对不同质量、不同初始速度、以及不同外形的冲头入水过程进行了计算，得到了冲头阻力系数、以及速度和加速度的变化规律，分析了各因素对高速冲头有界入水效果的影响。The early-stagee flow field and the motion of water-entry drift of a hydrodynamic brage are simulated numerically with the MAC(Marker and Cell) method. The gap between entry drift and the water container is very small and the depth of water issmall, so the rise of water surface is very large. The numerical boundary conditions on free water surface and on the surfaces of entry body and container is particularly treated. The computational results agree well with the experimental ones. The results show that the mass,the initial velocity,and the shape of entrying body,i. e. the drift,have great effects on hydrodynamic brake. A number of fingures and curves showing the variation of the properties relevant to this subject with time are given,such as the shape of water surface and the water-entry cavity,the pressure on entrying body surface and appointed point on container wall,the drag coefficients, and the velocity and acceleration of entrying body.

关 键 词：高速冲头 数值模拟 流体冲击 入水问题 

分 类 号：O353.4[理学—流体力学]