水下贴壁发射膛口动态过程仿真  

Simulation of the dynamic process of underwater wall-attached launch muzzles

作　　者：李超畅 严平[1] LI Chaochang;YAN Ping(College of Weaponry Engineering,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学兵器工程学院,武汉430033

出　　处：《兵器装备工程学报》2023年第6期140-147,共8页Journal of Ordnance Equipment Engineering

摘　　要：基于计算流体力学软件Fluent,采用动网格技术,对14.5 mm水下枪在贴壁30、50、70和100 mm四种工况下的全淹没式发射建立了二维平面模型并进行仿真计算。计算结果表明:弹前水柱在枪口的喷射速度达到250 m/s时,水射流两侧开始出现空化,壁面对空化效果有一定的抑制作用,贴壁距离d=50 mm时,壁面附近的空化区域难以形成完整的水蒸汽相,当贴壁距离增大到d=100 mm时,壁面对空化区域的影响基本消失;随着贴壁距离的减小,泰勒空腔边界在无壁面约束一侧的径向扩展速度逐渐增大;在非对称压力场中,射弹质心的径向位移随贴壁距离的减小而增大。Based on the computational fluid dynamics software Fluent,by using dynamic mesh technology,this paper establishes a two-dimensional plane model for the fully submerged launch of a 14.5 mm underwater gun close to a wall with a distance of 30 mm,50 mm,70 mm and 100 mm respectively,and performs the simulation calculation.The calculation results show that,when the jet velocity of the water column before the bullet reaches 250 m/s,cavitation begins to appear on both sides of the water jet,and the wall surface has an inhibitory effect on the cavitation of the muzzle.When the distance close to the wall d=50 mm,it is difficult to form a complete water vapor phase in the cavitation area near the wall.When the distance close to the wall increases to 100 mm,the influence of the wall surface on the cavitation area basically disappears.With the decrease of the distance close to the wall,the radial expansion velocity of the boundary of the Taylor cavity on the side without the wall constraint gradually increases.In the asymmetric pressure field,the radial displacement of the center of mass of the projectile increases with the decrease of the distance close to the wall.

关 键 词：水下枪 超空泡射弹 FLUENT 初始流场 膛口流场 贴壁发射 

分 类 号：TJ201[兵器科学与技术—武器系统与运用工程]