二级轻气炮内弹道过程研究
毕业论文关键词:二级轻气炮 数值计算 发射性能
Title Study on Interior ballistic process of two-stage light-gas gun Abstract Two-stage light-gas gun is a firing system which can obtain high velocity of projectile by high temperature and low molecular weight medium expanding to force projectile moving. It is a kind of universal high speed launching tool. In order to research the effect of two-stage light-gas gun parameters on the launching performance, the interior ballistics process is analyzed. According to the characteristics of two-stage light-gas gun firing, classic Interior theoretical description of charge indoor combustion of gunpowder and the piston movement, isentropic process description of thermal insulation light gas indoor air flow and movement of projectile, and both coupled with a motion of the piston, establishing mathematical model of two-stage light-gas gun firing. Using classic Runge-Kutta method for solving equations of Chamber, Chamber for solving equations using adiabatic isentropic process through two alternating parts, implements numerical simulation of launching process of two-stage light gas gun. Based on establishing the mathematical model of launching process of two-stage light gas-gun and numerical calculation, the theoretical computation is accomplished. A 30mm/100mm two-stage light-gas gun is taken for the primary computing model, and lots of data are obtained .by computing the model under different geometry parameters and different loading conditions. On the basis of the results of analyzing systematically, some laws of the effects of geometry parameters and loading conditions on the launching performance of two-stage light-gas gun are obtained, which laid a good foundation for further research.
Keywords Two-stage light-gas gunnumerical calculationemission
1绪论...1
1.1研究目的和意义...1
1.2轻气炮国内外研究概况.2
1.2.1轻气炮国外研究状况.2
1.2.2轻气炮国内研究现状.5
1.3主要研究内容.7
2二级轻气炮内弹道过程...9
2.1引言.9
2.2二级轻气炮的结构.9
2.3二级轻气炮的工作原理10
2.4二级轻气炮发射过程..11
2.5本章小结12
3二级轻气炮内弹道模型及数值方法13
3.1引言13
3.2二级轻气炮火炮部分模型..13
3.3二级轻气炮绝热等熵过程模型..15
3.4数值计算方法15
3.5数值模拟结果17
3.6本章小结.23
4二级轻气炮发射性能主要影响因素分析24
4.1引言24
4.2泵管内初始充气压力..24
4.3装药量..26
4.4活塞质量28
4.5弹丸质量30