锥头航行体高速斜入水的空泡流动特性数值研究
Numerical Studies on Cavity Flows Induced by High-speed Oblique Water Entry of a Cone Projectile
舒亮 1辛建建 1冯涛 1刘翔宇 1桂琴琴1
作者信息
- 1. 宁波大学船舶与海洋工程系,宁波 315211
- 折叠
摘要
数值研究弹体高速斜入水过程,考察空泡、流体动力特性和运动稳定性的变化规律.数值模型采用基于Realizable k-ε湍流模型的雷诺平均方法(RANS),并与模型试验结果进行对比,验证了该数值模型的精度.基于该方法模拟不同倾角下锥头弹体高速斜入水过程,考察弹体入水从初始撞击、开空泡的形成与发展、颈缩、表面闭合和溃灭等多个阶段.研究表明:空泡表面闭合时间随倾角的增大而提前;在撞击水面瞬间,弹体表面承受巨大砰击载荷,在弹头形成局部高压,其峰值随倾角的增大而增大.随着入水倾角增大,弹体偏转角和横向位移减小,具有更好的弹道稳定性.
Abstract
High-speed water entry of a cone projectile is great important to its navigation performance and structural safety.This paper investigates the detailed evolution procedure of the high-speed oblique water entry.The cavity flow evolution,fluid dynamic characteristics,and trajectory stability are examined.A numerical model is established based on Reynolds average Navier-Stokes equations with Realizable k-ε turbulence model.Accuracy of the present model is validated in comparison with the model experiment.High-speed oblique water entry of a cone projectile is simulated under different inclination angles.The comprehensive process of the water entry including initial impact,formation,development,contraction,closure,and collapse of the open cavity are captured.Closing time of the open cavity is advanced with the increase of the inclination angle.Huge slamming load on the projectile surface and local high impulsive pressure on the projectile nose is generated in the initial slamming stage.The peak value of the force increases with the increase of the inclination angle.In addition,as the inclination angle increases,the deflection angle and lateral displacement of the projectile is reduced,which results in better ballistic stability.
关键词
锥头弹体/高速入水/空泡流/斜倾角/数值模拟Key words
cone projectile/high-speed water entry/cavity flow/inclination angle/numerical simulation引用本文复制引用
基金项目
国家重点研发计划(2023YFE0102000)
国家自然科学基金(51909124)
浙江省自然科学基金(11LY21E090001)
浙江省自然科学基金(11LY21E090002)
浙江省自然科学基金(LGG22E080020)
出版年
2024
NETL
NSTL
万方数据