摘要
以D-45,S-14,3/1三种发射药为研究对象,对钢管约束条件下的高密实火药颗粒床的燃烧转爆轰(简称DDT)机理和敏感性进行了实验研究。分别用应变片和离子探针测量了药床中的压缩波和燃烧波的传播,通过对压缩波阵面和燃烧波阵面的分离,发现压缩波形成于火焰峰后的已燃区,它将不断加速与加强,最后赶上火焰峰形成强冲击波而诱发爆轰。提出了点火具处的压力快速上升是形成压缩波的必要条件,从而对三种发射药的DDT特性的差别做了很好的解释。此外,还考察了实验参数(火药特性,装填密度,约束条件)对DDT特性的影响。
The mechanism and sensitivity of deflagration to detonation transition(DDT) in highly packed granular propellant beds confined in steel tube have been experimentally studied for D-45,S-14,and 3/1 propellants.The compressive wave andflame front in the DDT processes were monitored by strain gages and ionization probes,respectively.By separating the compressive wave front and the combustion wave front,it was found that the compressive wove formed in the burning region behind the flamefront,with the increase of its strength and velocity,would overtake the flame front andforms a strong shock wave to initiate the detonation.The analysis for the experimentaldata showed that a rapid pressure increase near the ignitor was a necessary condition forthe formation of the compressive wave,which could explain the difference in DDT characteristics of the three propellants mentioned above.The influence on DDT characteristics of the experimental parameters(propellant properties,loading density,confinement) has also been investigated.
出处
《推进技术》
EI
CAS
CSCD
北大核心
1995年第6期66-73,共8页
Journal of Propulsion Technology
关键词
发射药
燃烧化学动力学
引爆
爆轰性
Gun propellant combustion,Combustion chemical kinetics,Shockwave initiation, Flame propagation