锥头圆柱体高速入水空泡数值模拟  

Numerical simulation of high-speed water-entry cavity of cone cylinder

作　　者：马庆鹏[1] 魏英杰[1] 王聪[1] 曹伟[1] 

机构地区：[1]哈尔滨工业大学航天学院,哈尔滨150001

出　　处：《北京航空航天大学学报》2014年第2期204-209,共6页Journal of Beijing University of Aeronautics and Astronautics

基　　金：哈尔滨市科技创新人才专项基金资助项目(2013RFLXJ007);中央高校基本科研业务费专项资金资助项目(HIT.NSRIF.201159)

摘　　要：采用流体体积法(VOF,Volume of Fluid)多相流模型,引入动网格技术,对锥头圆柱体垂直自由高速入水问题开展了数值模拟研究,分析了航行体入水后速度及入水空泡形态的发展规律,并与文献基于能量守恒定律的理论结果进行比较,两者吻合较好.研究结果表明,高速入水初期,结构受到极高的冲击载荷,导致速度迅速衰减;随着入水深度的增加,空泡不断拉长并向径向扩张,空泡内空化现象明显,空泡内混合相对空泡壁及空泡分离点附近压力分布影响显著.对于不同速度入水的研究结果表明,入水速度越高,航行体头部压力峰值越大,相同时刻入水空泡最大直径也越大.Numerical simulation for modeling the cavity formation induced by the highspeed waterentry of a cylinder body with a cone head was performed. Volume of fluid （VOF） model and dynamic mesh were in troduced for the multiphase flow and the movement of the body. The velocity attenuation and induced cavity shape were obtained with an initial velocity of 500 m/s. Good agreements were obtained compared with the theoretical results. During the early period of the water entry, the penetrating velocity decreased rapidly be cause of the high impact load affected on the cone which can be thousand times atmospheric pressure. The maximum cavity diameters of the waterentry cavity get larger when the initial velocity is higher. As the rigid body moves deeper, there is more vapor than air; the multiphase affects the stability of the cavity markedly.

关 键 词：流体力学 高速入水 空泡 锥头圆柱体 数值模拟 

分 类 号：TV131.2[水利工程—水力学及河流动力学]