爆炸与冲击2024，Vol.44Issue(1)：115-129,15.DOI:10.11883/bzycj-2023-0156
空心弹高速入水机理及特性数值模拟研究
Numerical simulation study on the mechanism and characteristics of high-speed water entry of hollow projectiles
摘要
Abstract
To analyze the mechanism and characteristics of high-speed water entry of hollow projectiles,a numerical simulation study of the high-speed water entry of the hollow projectiles was carried out based on the Reynolds average Navier-Stokes equation(RANS),the volume of fluid(VOF)multi-phase flow model,the realizable k-ε flux model,the Schnerr and Sauer aeration model,the six-degrees-freedom(6-DOF)motion simulation method,and the overlapping grid technology.The effects of through-hole aperture and head shape on the cavitation characteristics,cavity morphology,and water entry kinematic properties of the hollow projectile were obtained.The effectiveness of the calculation method was verified by comparing it with the water entry experiment.The results show that the numerically calculated cavity morphology and water entry velocity and displacement curves are in good agreement with the experimental results,which verify the effectiveness of the numerical simulation method.When the through-hole aperture is different,the larger the through-hole aperture,the more pronounced the cavitation phenomenon and the longer the through-hole jet,but the effect on the radius of the cavity is not significant.The smaller the through-hole aperture,the earlier the closure time,the higher the peak drag coefficient resulting from impact with the water surface,and the greater the drag coefficient after the hollow projectile has stabilized in the water.The movement of the hollow projectile is most stable when the dimensionless diameter is between 0.575 and 0.600.When the head cone angle is varied,the larger the head cone angle,the larger the diameter of the cavity,and the later the cavitation phenomenon begins,but the faster the cavitation is generated.As the head cone angle increases,the drag coefficient becomes larger and the velocity of the hollow projectile decays faster,moving a shorter distance at the same time.However,the larger the head cone angle,the smaller the change in pitch angle and the more stable the motion of the hollow projectile.关键词
空心弹/空泡演化/高速入水/运动特性Key words
hollow projectile/cavity evolution/high-speed water entry/motion characteristics分类
数理科学引用本文复制引用
黄振贵,范浩伟,陈志华,周可,刘想炎,王浩..空心弹高速入水机理及特性数值模拟研究[J].爆炸与冲击,2024,44(1):115-129,15.基金项目
国家自然科学基金(12002165) （12002165）
江苏省自然科学青年基金(BK20210348) （BK20210348）
