【摘要】 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，在发射药中加入1.5%K₂SO₄后，火炮炮口C和CO等可燃组分的质量分数有明显的降低，炮口外最高温度从3 000 K降低至2 200 K,从而说明加入消焰剂可以有效抑制炮口烟焰的产生与发展。仿真结果与试验图片对比发现，二者的轮廓形状及尺寸具有一致性，且采用单元网格对炮口外火球面积进行估算后，发现相对面积误差不超过5%,从而为研究大口径火药射击过程中降低炮口烟焰等有害现象提供了理论支撑。更多还原

【Abstract】 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.更多还原