摘要
为了使理论计算结果更为准确可靠,对一级气体炮内弹道经典方程进行修正。分析了一级气体炮内弹道经典方程存在的问题及原因,指出气室容积不能忽略。提出了气体密度新的表达方式,并根据质量守恒方程、气流动量方程、弹丸运动方程、气体绝热膨胀方程和理想气体状态方程等,联立推导出一级气体炮内弹道修正方程。将修正方程、经典方程计算结果与内弹道流体数值仿真结果进行对比,结果表明:在容积比较小的情况下三者的偏差很小;但随着容积比的增大,经典方程计算结果偏离修正方程和数值仿真计算结果;经典方程仅适用于容积比较小的情况;而修正方程的适用范围不受容积比大小限制,验证了修正方程的正确性和适用性。
In order to improve the accuracy and reliability of the theoretical calculation result,the classical equation for interior ballistics of one-stage gas gun was modified. The problem of classical equation was analyzed. The result shows that the influence of air chamber volume on bullet velocity can not be ignored.A new expression of gas density was presented. According to the equation of mass conservation,the momentum equation of flow,the motion equation of projectile,the adiabatic expansion equation of gas and ideal-gas equation,the modified equation of one-stage gas gun were deduced. The calculation results of muzzle velocity by classical equation and amendatory equation were compared to the result of numerical simulation of interior ballistics. The results show that the muzzle velocity obtained by above mentioned three methods is almost same when the volume ratio of air chamber to gun barrel is very small,but the differences between the results obtained by classical equation and the results obtained by the modified equation and numerical simulation increase markedly with the increase of volume ratio. The classical equation is only suitable for calculating velocity of gas gun with small volume ratio,and the modified equation can be used without volume ratio limit.
出处
《弹道学报》
CSCD
北大核心
2016年第1期14-18,共5页
Journal of Ballistics
基金
中国工程物理研究院高新装备专项
关键词
气体炮
内弹道
炮口速度
容积比
gas gun
interior ballistics
muzzle velocity
volume ratio
