DNTF基炸药燃烧转爆轰影响因素实验研究

为了研究二硝基呋咱基氧化呋咱(DNTF)基混合炸药燃烧到爆轰转变(DDT)过程的有效调控技术,采用同轴电离探针测量技术研究了点火药量、DDT管壁厚约束、成型方式等对DNTF基混合炸药DDT性能的影响,从DDT管破裂状态、DDT过程不同位置处波阵面速度、诱导爆轰距离等变化对实验结果进行了分析。结果表明,DDT管壁厚约束对DNTF基混合炸药DDT的诱导爆轰距离没有明显影响,都在375 mm左右,但壁厚减小会使爆燃阶段持续时间增加,达到爆轰的初始速度减小到5515 m·s~(-1);点火药量增加对DNTF基混合炸药DDT反应剧烈性没有明显影响,但会减小初始燃烧持续时间和诱导爆轰距离;压制成型试样DDT的初始燃烧持续时间、爆燃持续时间及诱导爆轰距离均大于熔铸成型试样,但反应剧烈性没有差别。

Experiment Study on the Influence Factors of the Deflagration to Detonation Transition for DNTF-based Explosives

To study the effective regulation and control technology of the deflagration to detonation transition (DDT) process for DNTF-based composite explosive, the effect of ignition charge mass, DDT tube wall thickness constraint and molding way etc. on the performance of DDT for DNTF-based composite explosive was investigated by the coaxial ionization probe test technology. The test results were analyzed from the view of the change in rupture state of DDT tube, wave front velocity at different location of DDT process and inducement detonation distance etc. Results show that the DDT tube wall thickness constraint has no significant effect on the inducement detonation distance of DDT for DNTF-based composite explosive, which is at about 375 mm, but decreasing wall thickness can make the duration time of deflagration stage increase and the initial velocity to detonation reduce to 5515 m·s^-1. Increasing ignition charge mass has no significant effect on the reaction violence of DDT for DNTF-based composite explosive, but it can reduce the duration time of initial combustion and detonation induced distance. The duration time of initial combustion, duration time of deflagration and detonation induced distance of the pressed molding specimen are greater than those of the cast specimen, but there is no obvious difference in the violence of the reaction.