锥头圆柱体高速入水空泡深闭合数值模拟研究  

Numerical Simulation of Deep Closure 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] 陈超倩[1] 

机构地区：[1]哈尔滨工业大学航天学院,黑龙江哈尔滨150001

出　　处：《兵工学报》2014年第9期1451-1457,共7页Acta Armamentarii

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

摘　　要：考虑入水过程的空化效应,基于有限体积法和流体体积(VOF)方法求解气、汽、液三相流动的RANS方程,并引入动网格技术,对小型锥头圆柱体高速自由垂直入水问题开展了数值模拟研究,得到了入水空泡演化过程以及深闭合过程空泡流场的流动特性和压力分布特性。将入水弹道及空泡形态的数值结果与理论分析结果进行了对比,验证了数值计算结果的正确性。对入水空泡深闭合的研究结果表明,高速条件下入水空泡的深闭合发生在面闭合之后、自由液面以下较深位置,空泡在深闭合后迅速溃灭。同时,在空泡内外多相流场的相互作用下,空泡壁尚未完全收缩至轴线便已闭合,闭合区域出现高压区,压力极值始终出现在空泡分离点处直至空泡溃灭。Numerical simulation for modeling the cavity formation process of high-speed water entry is performed. Finite volume method is introduced to discretize the Reynolds averaged Navier-Stokes equations. Results on the velocity and trajectory show good agreement with the results obtained by the analytical model. The flowing characteristics and pressure distribution of the deep closure stage are also studied. Results show that the deep closure occurs after surface closure and at a deep penetration depth for high- speed water entry problem, and the cavity collapses very quickly after the deep closure. The cavity closes under the effects of multiphase flow before the cavity wall shrinks completely, which induces high pressure around the deep closure area, and the maximum pressure always act on the separating points until the cavity collapses.

关 键 词：流体力学 多相流 高速入水 空泡 深闭合 

分 类 号：TV131.2[水利工程—水力学及河流动力学]