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

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 hydrogen-oxygen 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.