The effect of the initial pressure produced by igniter and black powder on the ignition end surface of inert mock material was studied in DDT tube.The combustion luminescence process of pressed HMX-based polymer bonded explosive in DDT tube was recorded by a high speed camera.The initial reaction evolution process of pressed PBX explosives was analyzed.The results show that initial pressure produced by the igniter and black powder can induce crack formation and local damage on the surface of adjacent brittle explosive, and the combustion flame can spread along the explosive matrix cracks and the gap between explosive and tube wall.The initial reaction evolution of pressed PBX explosives and the gap were closely related to the convective combustion process.%在DDT管中采用惰性模拟材料研究电点火头和黑火药产生的初始压力对惰性模拟材料点火端面的影响;采用高速摄像机记录了DDT管内HMX基压装PBX炸药的燃烧发光过程;分析了压装PBX炸药DDT管实验初始反应演化过程.结果表明,电点火头和黑火药产生的初始压力会引起邻近脆性炸药端面裂纹形成和局部破坏,炸药燃烧的火焰沿炸药基体裂纹和炸药与管壁之间的缝隙中传播,压装PBX炸药初始反应演化与缝隙对流燃烧过程密切相关.
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