多种复合炸药装药的慢烤特性及其机理

Characteristics and Mechanism of Slow Cook-off of Composite Explosive Charges

为研究不同结构复合装药在慢速烤燃过程中的响应规律,分别设计了JH-2和JHB炸药的φ19 mm单独药柱装药和φ30 mm复合药柱装药烤燃弹,通过慢速烤燃试验分别获得了单独药柱烤燃弹在1和2℃·min^(−1)升温速率、复合药柱烤燃弹在1℃·min^(−1)升温速率下的温度-时间变化曲线,并结合数值模拟进一步分析了烤燃弹内部温度场的变化。研究结果表明:单独药柱装药情况下,低敏感炸药能明显降低弹药在热刺激下的响应等级;而在复合药柱装药时,烤燃弹响应点均位于外层低敏感药柱靠近壳体的环状区域,响应温度随高能药柱直径的增加而升高,响应等级随外层低敏感药柱厚度的增加而增加,复合装药由于药柱接触面存在接触热阻,烤燃弹传热受到阻滞,使得内部高能药柱极少参与反应。

In order to study the response law of composite charges with different structures in the process of slow cook-off,the cook-off bombs filled with φ19 mm single charges of explosives JH-2 and JHB and φ30 mm composite charges were designed.The temperature-time curves of single charges at 1 and 2℃·min^(−1) and composite charges at 1℃·min^(−1) were obtained in tests,and combined with the numerical simulation to further analyzed the temperature field inside the bomb.The research results show that in the case of a single charge,the low-sensitive explosive can significantly reduce the response level of the bomb under thermal stimulation;while in the case of a composite charge,the response point of the bomb is located at the annular region of the outer low-sensitive charge near the shell.The response temperature increases with the increase of the high-energetic charge’s diameter,and the response level increases with the increase of the outer lowsensitive charge’s thickness.The heat transfer in the bomb is retarded due to the contact thermal resistance between the contact surface of composite charges,thus the inner high-energetic cylinder is rarely involved in the reaction.