初始条件对氢氧爆轰气体炮内弹道性能的影响规律

Influence of Initial Conditions on the Interior Ballistic Performance of Hydrogen-Oxygen Detonation Gas Gun

为分析不同初始条件对氢氧爆轰气体炮内弹道性能的影响,基于计算流体力学方法,利用FLUENT软件建立了氢氧爆轰气体炮二维数值计算模型,同时基于40 mm口径气体炮开展发射实验,对计算模型的有效性进行了验证。通过数值模拟,得到了初始压力、氮气含量和反应气体配比对氢氧爆轰气体炮内弹道性能的影响规律。结果表明:提升气室初始压力和氮气含量均可以有效地提高弹丸发射速度,同时氮气能够降低气室平均温度,提升反应气体的能量利用率;存在反应气体的优化配比,在保持初始压力不变的条件下,通过注入适量的氮气能够在提高能量利用率的同时得到较高的发射速度。

In order to analyze the influence of different initial conditions on the interior ballistic performance of hydrogen-oxygen detonation gas gun,a two-dimensional numerical model of hydrogenoxygen detonation gas gun was established by using FLUENT software,which is based on the computational fluid dynamics method.The validity of numerical model was verified by launching experiments of 40 mm caliber gas gun.The influence mechanisms of initial pressure,nitrogen content and reaction gas ratio on the interior ballistic performance of hydrogen-oxygen detonation gas gun were revealed by numerical calculation.The results show that,increasing the initial pressure and nitrogen content of the gas chamber can effectively improve the projectile launching speed,while nitrogen can reduce the average temperature of the gas chamber and improve the energy utilization rate of the reaction gas.The results indicate that there exists an optimal ratio of reaction gas dose,injecting nitrogen with proper content can improve the energy utilization and get higher launch speed under the same initial pressure.