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针对发射药内弹道性能预估时,火炮膛内热散失修正程度难以确定的问题。提出了一种基于密闭爆发器实验的发射药燃气膛内传热计算方法,根据该试验测得的压力与时间信号及发射药燃气在密闭环境中做功能力与压力之间的关系,确立发射药燃气与膛壁的传热方程,结合内弹道方程组,得到考虑火炮膛内热散失的内弹道模型,并将该模型用于双芳-3发射药的内弹道性能预估。结果显示仿真得到的最大膛压、初速与实测结果的误差均小于2.5%,表明了该模型的有效性和优越性。
In view of the projectile’s internal ballistic performance prediction, it is difficult to determine the degree of heat dissipation correction in the gun chamber. A calculation method of heat transfer in propellant gas chamber based on closed-cell burst experiment is proposed. According to the relationship between pressure and time signal and propellant gas in a closed environment, The heat transfer equations of gas, gas and wall are obtained. Combined with the internal ballistic equations, the internal ballistic model considering the heat loss in the chamber is obtained. The model is used to estimate the internal ballistic performance of the bi-aromatic-3 propellant. The results show that the error of the maximum chamber pressure, the initial velocity and the measured results are less than 2.5%, which shows the effectiveness and superiority of the model.