多孔式喷管减后坐枪炮发射过程仿真与优化

Study on Influence Factors on Recoilless Porous Structures with Laval Nozzles

为了优化多孔式拉瓦尔喷管减后坐结构,将机枪的发射过程分为6个阶段,运用准一维两相流理论建立机枪发射过程的动力学模型,并以某7.62 mm机枪为研究对象进行仿真,得到了机枪在不同方案下的弹丸速度和枪身的后坐力曲线,分析了导气孔之间的距离和导气孔数量等参数对弹丸初速和减后坐效率等发射性能的影响规律。计算结果表明:上述减后坐结构条件下能够在弹丸初速下降较小的情况下,较大的提高减后坐效率,并通过对比计算结果可找出最佳方案。

In order to optimize porous reducing recoil structure with a Laval nozzle, a dynamic model was estab- lished based on one-dimensional two-phase flow theory. Taking 7.62ram test gun as a research object, a numerical simulation was carried out, and it achieved the curves of the muzzle velocity of projectile and the efficiency of reduc- ing recoil force for different projects. The influences of such parameters on the muzzle velocity of projectile and the ef- ficiency of reducing recoil force were calculated and analyzed, as the distance of holes and the number of holes. The results show that the efficiency of reducing recoil force is improved obviously while the muzzle velocity of projectile does not been significantly reduced. By comparing and analyzing the results, the best program was found out.