射击模式对身管温度场影响的研究

以某5.8mm自动步枪身管为研究对象,基于经典内弹道和传热学基本原理,运用一种热-化学方法,建立了三维瞬态身管传热有限元模型,研究了不同射击模式影响下的身管温度场。研究表明:1)镀层对于身管内膛最高温度影响高达12.5%,在身管热分析中不可忽略;2)半自动模式膛内温度比全自动模式降低15.7%;3)对于同样的射弹数,射频的提高与外壁最高温度呈负相关,且最高温度区域会逐渐向身管尾部移动。研究结果可为探讨及解决热散问题提供一定的参考价值。

Study on the Influence of Shooting Mode on Barrel Temperature Field

Based on the classical internal ballistic and heat transfer basic principles,a threedimensional finite element model of transient heat transfer in gun tube was established.And the temperature field of the gun tube under different shooting modes was studied.The research shows that:1) the effect of the coating on the maximum temperature of the inner surface is up to 12.5%,which can’t be ignored in the thermal analysis of the gun tube;2)comparing with automatic fire mode,semiautomatic fire mode can reduce the temperature of the inner surface by 15.7%;3) shooting same quantity projectiles,the increase of firing rate is negatively correlated with the maximum temperature of the outer surface,and the maximum temperature region will gradually move towards the rear of the barrel.The research results can provide some reference value for the discussion and solution of the thermal-dispersion problem.