摘要
为研究弹带挤进过程机理以及弹丸在挤进过程的运动规律,对大口径火炮挤进过程进行了仿真分析。考虑了火药气体在带锥度药室及坡膛内的分布,得到挤进时期的内弹道学方程,将该方程的解作为力边界条件,同时引入考虑温度的摩擦力模型来模拟身管与弹带间的摩擦,采用显式方法建立大口径火炮弹带挤进过程热力耦合仿真模型;分别对经典内弹道挤进过程和绝热挤进进行计算,验证了耦合计算的必要性;同时考虑不同弹炮间隙、卡膛速度以及初始摆角对挤进过程的影响,得到挤进过程中挤进阻力、弹丸速度、火药气体压力、弹丸摆角的变化规律。计算结果表明,弹炮间隙对挤进阻力和挤进速度有着重要的影响,而弹丸卡膛前摆角对弹丸挤进过程中的摆角有着重要的影响。
To investigate the mechanism of engraving process and the rule of initial motion of projectile during lauching process,the engraving process of rotating band of large-caliber howitzer is simulated. The gas pressure distribution of propellant in the tapered chamber is taken into consideration to get the interior ballistic equation during engraving process,and the solution of the equation is taken as the boundary condition of coupled thermo-mechanical analysis of engraving process. Meanwhile,the friction between the rotating band and the barrel is modeled using modified Coulomb model in which the temperature at the interface is taken into consideration. Uncoupled internal ballistic engraving process and adiabatic engraving process are calculated to verify the necessity of the coupled analysis. The resistance,projectile velocity,propellant gas pressure and projectile attitude are got by considering the changes in clearance between projectile and barrel,initial velocity and initial projectile attitude. The calculated results show that the clearance between projectile and barrel plays an important role in determining the resistance and projectile velocity,and the initial projectile attitude has a great effect on the projectile attitude in the process of engraving.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2016年第10期1803-1811,共9页
Acta Armamentarii
基金
国家自然科学基金项目(11472137)
关键词
兵器科学与技术
热力耦合
挤进阻力
弹丸姿态
ordnance science and technology
coupled thermo-mechanical
engraving resistance
projectile attitude
