弹带挤进过程内弹道特性研究

Interior ballistics' features during rotating band engraving process

将弹带应变能和摩擦耗散能引入到经典的内弹道能量平衡方程。考虑药室锥度计算膛内火药气体压力的分布规律,得到弹丸起始运动内弹道方程,并将其解作为力边界条件,利用显式方法对三维弹带挤进过程进行热力耦合计算;同时,采用改进库伦模型,考虑温度对摩擦力的影响计算弹带身管之间的摩擦力。分析了典型火炮挤进过程中挤进阻力、膛压以及弹丸速度的变化规律,对火炮设计、射击精度提供了有效的参考。

The initial interior ballistic equation of a projectile during rotating band engraving process was derived by introducing the rotating band＇s strain energy and friction dissipation energy into the classical interior ballistic energy balance equation and calculating the propellant gas pressure distribution law in the tapered chamber,the solutions to the equation were taken as the force boundary conditions of the thermo-mechanical coupled analysis of the engraving process. The friction between the rotating band and the barrel was modeled using the modified Coulomb model considering the influence of the temperature at the interface on friction force.The velocity of the projectile and the pressure in the bore were gained and the changes of the squeezing resistance of a typical artillery were analyzed.The results provided a reference for artillery design and firing accuracy.