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摘要二级轻气炮是一种利用高温低分子量气体工质膨胀做功的方式来推动弹丸，使弹丸获得极高速的发射系统。它是一种特别通用的高速发射工具。我们展开了对其内弹道过程的研究，来探索各发射参数对其发射性能的影响规律， 。 根据二级轻气炮发射特点，对药室内的火药燃烧状况和活塞的运动过程，采用经典内弹道理论来描述， 采用绝热等熵过程描述轻气室内气体的流动状态和弹丸的运动状态，并通过活塞的运动状态以及其两侧的压力差将两者进行耦合，从而建立起二级轻气炮发射过程的数学模型。运用经典龙格库塔方法求解药室方程，运用绝热等熵过程求解气室方程，通过两部分计算的交替进行，实现了二级轻气炮发射过程的数值模拟。 通过建立数学模型，运用数值计 算 方法进行求解，实现了二级轻气炮发射过程的理论计算，简单分析和总 结 出结构参数和装填条件对二级轻气炮发射性能的影响规律，为进一步研究奠定了基础。 61031
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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