考虑化学反应的大口径火炮炮口流场特性

大口径火炮由于其装药元件复杂,装药量较大,发射过程中产生炮口冲击波及炮口焰的问题较为严重,容易对人员或设备造成损伤.为研究炮口焰的生成等炮口流场特性,以某155 mm口径火炮为模拟仿真对象,针对射击过程中高速、高压、高温且与外界环境发生复杂的化学反应等特点,建立化学反应模型.同时,又考虑到弹丸射出过程中会与身管壁面产生...

Characteristics of Muzzle Flow Field of Large Caliber Gun Considering Chemical Reaction

The strong blast wave and muzzle flash generated during launching may damage the perssonnel or equipment and expose the launching position since large-caliber gun has complicated charging elements and a large amount of charge. The launch process of a 155 mm gun is simulated to study the characteristics of conditions of muzzle flow field, such as the formation of muzzle flash. A chemical reaction model is proposed, in which the characteristics of high speed, high pressure, high temperature and complex chemical reactions with environment during launching are considered. And also the Reynolds averaged Navier-Stokes equation and k-ε turbulence model are established by taking into account the small disturbance of projectile and barrel wall. The formation and evolution process of muzzle field after a projectile is discharged from the muzzle without considering the initial flow field are simulated and analyzed based on the established muzzle flow field model. The results of numerical analysis clearly show the complex wave system structures such as Mach disk, blast wave, and the generation of muzzle flash, especially the secondary flash. The results show that the calculated shape and size of fireball are in good agreement with the experimental results, and the error between the calculated and experimental results is no more than 8%.