电磁发射弹丸膛内流场数值分析  

Numerical analysis of in-bore flow field of electromagnetic launcher projectile

作　　者：冯军红 鲁军勇[1] 李开 李湘平[1] FENG Jun-hong;LU Jun-yong;LI Kai;LI Xiang-ping(National Key Laboratory of Science and Technology on Vessel Integrated Power System,Naval Univ.of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学舰船综合电力技术国防科技重点实验室,武汉430033

出　　处：《海军工程大学学报》2021年第3期43-48,共6页Journal of Naval University of Engineering

基　　金：国家自然科学基金资助项目(51925704,51877214);湖北省自然科学基金资助项目(2019CFB373)。

摘　　要：电磁发射超高速弹丸具有重要的军事应用价值。因此,采用动网格技术耦合Realizable k-ε湍流模型,对电磁发射一体化弹丸的膛内及膛口流场进行了数值计算,研究了弹丸膛内的压力/温度变化规律、膛口流场结构以及冲击波衰减规律。研究结果表明:弹丸头部形成的脱体激波强度和距离与弹丸运动速度紧密相关;在弹丸出膛瞬间,膛口形成圆环型的冲击波结构,随后迅速衰减;弹丸气动分离的机理是弹丸出膛瞬间时迎风窝内外压差变化较大,形成的气动分离力将弹托锁定机构拉断。Hypervelocity projectile launched by the rail gun has an important military application.The dynamic grid technology coupled with the realizable turbulence model was used to calculate the inte-rior and muzzle flow field of integrated launch projectile.The in-bore pressure/temperature contour,the muzzle pressure field and the shock wave attenuation were analyzed.Results show that the strength and distance of the shock wave formed by the projectile are closely related to the projectile velocity.At the muzzle,a ring-shaped shock wave is formed,and then rapidly attenuated downstream.The mechanism of aerodynamic discard of sabot is that pressure difference in the wind′s eye changes greatly at the moment when the projectile exits the chamber,and then the sabot is pulled off under this aerodynamic force.

关 键 词：电磁发射技术 一体化弹丸 脱体激波 气动分离力 

分 类 号：TM33[电气工程—电机]