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利用拉格朗日方法跟踪弹后工质的运动规律，采用ＶｏｎＮｅｕｍａｎｎＲｉｃｈｔｍｙｅｒ差分格式对带有坡膛、有限药室长的一级轻气炮进行了内弹道一维数值模拟，对不同的工质，在初温及相对装药量变化的情况下进行了计算．计算结果表明：（１）对同一种工质，初始装填压力ｐ０和ω／Ｍ相同时，初温对弹丸的相对初速ｖｇ／ｃ０和炮口压力ｐｇ几乎没有影响；（２）对同一种工质，在ｐ０相同时，ｖｇ／ｃ０可表示成ω／Ｍ的函数，并随ω／Ｍ的增大而增大；（３）同一初温下，在ｐ０和弹丸质量ｍ相同时，分子量小的气体可使压力降ｐｇ／ｐ０越小，从而使弹丸获得较大的初速ｖｇ．
The Lagrange method was used to track the movement law of the post-ammunition. The Von Neumann Richtmyer difference scheme was used to simulate the internal-ballistic one-dimensional numerical simulation of the first-level light gas gun with sloping chamber and limited length. The initial temperature and relative charge changes were calculated. The results show that: (1) For the same working medium, the initial initial filling pressures p0 and ω / M are the same, the initial temperature of the projectile relative muzzle velocity vg / c0 and muzzle pressure pg almost no effect; (2) , Vg / c0 can be expressed as a function of ω / M at the same p0, and increases with the increase of ω / M; (3) Under the same initial temperature, when p0 is the same as the mass of the projectile, the molecular weight is small Gas can make the pressure drop pg / p0 smaller, so that the projectile get a greater initial velocity vg.