一维两相流模型在埋头弹药内弹道学中的应用

Application of One-dimensional Two-phase Flow Model in CTA Interior Ballistics

很多弹药特别是埋头弹药应采用多维两相流内弹道模型,但这样建模以及计算的工作量太大,为此,在分析其工作机理的基础上,将其内弹道过程简化为一维两相流模型,给出了有关方程和定解条件。采用MacCormack差分格式对不同长度的传火管分别进行数值计算,模拟结果与试验有较高的吻合度,结果表明:采用长传火管的内弹道性能较好。模型再现了其发射过程,分析了埋头弹药内弹道的特点,有关分析可以指导其结构设计和装药设计。

Multi-dimensional multi-phase flow interior ballistic model should be used in most ammunition, especially CTA （Cased Telescoped Ammunition）, but the workload about establish model and calculate is excessive. So, based on the analysis of its mechanism, the interior ballistic course was simplified as one-dimensional two-phase flow model. the equations and its solve condition were given. MacCormack scheme was used to calculate in different length igniter condition, the simulation results are coincident with the experiments, and it show that： longer igniter can get better interior ballistic performance. The model reappeared the propulsion processes of CTA, and some interior ballistic features were analyzed, the analysis could guide the structure design and charge design.