火炮内膛涂油弹炮接触熔化热流体模型与分析

Model and Analysis of Melt-lubrication Between Band and Tube with Oil on Gun Internal Surface

该文就火炮内膛涂油条件下,弹丸在膛内高速运动中的弹炮接触熔化进行了分析,建立了涂油条件下的弹炮接触熔化热流体模型,进行了数值计算,计算了弹带熔化速度和厚度及其对弹丸摩擦系数的影响,结果与实验值吻合较好。计算结果表明:在弹丸滑动速度到达一定数值后,首发涂油时的摩擦系数与无油时一致。但在此之前,即弹丸运动初期的一段距离上,摩擦阻力大于后续各发,这是造成首发炮弹初速偏大,射程偏远的一个因素。该文所得结果可应用于内弹道计算,从而为认识弹丸在膛内强制滑动下的接触摩擦及其弹丸运动中的阻力机制,弄清炮膛涂油对弹丸初速的影响提供了理论依据。

This paper establishes a mathematical model of melt-lubrication between band and gun tube with oil on the bore interface. Through numerical calculation, the velocily and the thickness of band melt-liquid are given and the influences of friction coefficients are calculated. The calculation results approximately accord with experimental results. The results show that the friction coefficients of the first round projectile are the same as those of the latter rounds after a few distance, but the first one is larger than the latter one when the projectile starts moving. It is an important factor that makes first round velocity higher and range further. The model can be applied in interior ballistic calculation and helps to understand the friction and the grip resistance mechanism on coercive sliding. This paper provides theoretical references about how the oil influences projectile velocity.