消焰剂对大口径火炮炮口烟焰的影响

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烟焰的问题较为严重,容易对人员或战地伪装带来威胁.为研究炮口烟焰的生成与发展等相关情况,以某155 mm炮为模拟仿真对象,建立考虑消焰剂的化学反应模型.采用压力隐式算子分割算法,对火炮发射药中添加消焰剂情况下进行火炮炮口全流场模拟仿真.仿真结果表明,在发射药中...

Effect of Flame Inhibitor of the Muzzle Flame of Large Caliber Gun

Because of the complexity of charge components and large charge weight of the large caliber gun, the muzzle flame is more serious during firing, which is easy to bring threat to personnel or battlefield camouflage. A chemical reaction model considering flame inhibitor for a 155 mm gun is established to study the generation and evolution of muzzle flame. PISO algorithm is used to simulate the muzzle flow field of gun with or without adding flame inhibitor. The simulated results show that the mass fractions of combustible components ( C and CO) in the gun muzzle decrease obviously and the maximum temperature outside the muzzle decreases from 3 000 K to 2 200 K after 1.5% K₂SO₄ is added into the propellant. This explains that the flame inhibitor can effectively inhibit the generation and evolution of muzzle flame. By comparing the simulated results with the experimental images, it can be seen that the shapes and sizes of simulated and experimental muzzle flame profiles are consistent. Also, it is found that the error is less than 5% after using the element grid to estimate the fireball area outside the muzzle.