火炮后效期内弹底压力预估理论模型研究  

Research on Prediction Theoretical Model of Projectile Base Pressure during Aftereffect Period

作　　者：周梦笛 曹从咏[1] 钱林方[2] ZHOU Mengdi;CAO Congyong;QIAN Linfang(School of Automation,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China;School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China)

机构地区：[1]南京理工大学自动化学院,江苏南京210094 [2]南京理工大学机械工程学院,江苏南京210094

出　　处：《兵工学报》2019年第6期1304-1309,共6页Acta Armamentarii

摘　　要：火炮后效期内弹丸在膛口高压火药燃气的作用下发生扰动,进而影响其外弹道特性。为提高射表的精准性并优化弹丸设计,开展了后效期内弹底压力的研究。针对传统计算流体力学(CFD)仿真耗时过长的不足,基于普朗特-迈耶膨胀波关系及等熵流动,建立后效期内弹底压力预估理论模型,并提出压力边界估计的修正模型。以某射击试验中测得的膛口数据为例进行仿真分析,将该模型与CFD三维模型仿真结果进行对比。结果表明:所提模型仿真结果与CFD模型仿真结果相差很小,但计算耗时显著减小,由约1. 5 h减小为不到1 s;研究成果为火控系统所需外弹道参数可提供一种快速计算方法,为射表编制和弹丸合理设计可提供理论参考依据。The projectile is disturbed by high-pressure gas during aftereffect period,which affects its exterior ballistic characteristics. The change of pressure on the base of projectile during the aftereffect period is studied for improving the accuracy firing table and optimized design of projectile. As computational fluid dynamics( CFD) simulation takes a long time,a theoretical model based on Prandtl-Meyer wave and isentropic flow is established for predicting the pressure on the base of projectile,and a modified model of pressure boundary estimation is proposed. The muzzle dates measured in a firing practice test were analyzed. The results show that the simulated results of the proposed model and CFD 3 D model have less difference,but the calculating time of the proposed model is shorter,which is decreased from about1. 5 h to less than 1 s.

关 键 词：火炮 弹底压力 后效期 普朗特-迈耶膨胀波 等熵流动 

分 类 号：TJ012.2[兵器科学与技术—兵器发射理论与技术]