镁粉尘燃烧转变为爆轰的研究

The Studies of Transition from the Deflagration to Detonation for Magnesium Powder

本文利用我们研制的多种激波管技术成功地研究了镁粉尘燃烧转变为爆轰(俗称 DDT)过程。研究表明,镁粉尘颗粒大小对镁粉 DDT 过程影响不大。对于强冲击引爆,镁粉尘爆轰压力和速度随着氧含量的增加而急剧增加,它们的相对增加量可达4倍之多;在弱冲击引爆时,镁粉尘仅产生燃烧,其爆炸压力和速度都比较弱;在反射波引爆时,能产生较强的镁粉尖爆轰。本文利用烟膜技术和传感器技术直接证明了镁粉尘爆轰的存在。

The transition from the deflagration to the detonation for Magnesium powder is studied by means of measurement techniques in explosion shock tube.The results show that the in- fluence of particle size for Magnesium powder on the transition from deflagration to detona- tion is not obvious.The detonation pressure and velocity of Magnesium powder for the initia- tion of strong shock wave raise,as Oxygen in the mixture increases,their relative increases are four times;for the initiation of weak shock wave,Magnesium powder can be combustion, its explosion pressure and velocity are weak;for the initiation of reflective wave,the detona- tion of Magnesium powder can be formed.Our results measured by both smoking film tech- nique and gauges technique directionally demostrate the existence of the detonation for Mag- nesium powder.