压缩空气弹射内弹道影响因素作用规律研究

Analysis of Factors to Compressed Air Ejection Interior Ballistic Based on FLUENT

针对某直筒式压缩空气弹射装置工作过程中存在诸多因素影响其内弹道特性的问题,为有效改善内弹道特性,提升装置整体弹射性能,对这些因素作用于内弹道特性的规律进行研究必不可少。选择以控制阀直径、发射筒径及初始温度3个因素作为分析重点展开研究。在计算流体动力学软件FLUENT中建立压缩空气弹射装置简化模型,通过网格无关性验证,选择了网格数合适的网格模型;设置合理参数,运用动网格技术进行计算仿真,得出不同控制阀直径,筒径及初始温度情况下弹射装置内弹道特性的不同变化规律。由于研究对象为直筒式弹射装置,针对该型压缩空气弹射器的研究较少,研究结果可为压缩空气弹射过程内弹道的深入研究提供理论参考。

Aiming at the situation that there exist many factors affecting the interior ballistic characteristics of a straight-cylinder high-pressure-air device when it works,to improve the interior ballistic characteristics and enhance ejection performances of the ejector effectively,studying the law on interior ballistic characteristics is indispensable. After establishing the simplified model of the compressed air ejector in FLUENT and finishing the grid independence verification,a grid model of suitable gird numbers is chosen;by setting appropriate parameters and applying the dynamic mesh technique to simulate,different change laws of inner ballistic characteristics under different control valve’s diameters,tube diameters and the initial temperature are received. Because the research object is a straight-cylinder ejector on which the research is less,the results could offer references for the further study of inner ballistic characteristics in the compressed air ejection process.