大型水平管道中环氧丙烷-铝粉-空气混和物爆燃转爆轰的实验研究

Experimental Research of Deflagration to Detonation Transition of Epoxypropane-Aluminum-Air Mixtures in Large-Scale Tube

在长为32.4 m、内径为0.199 m的大型长直水平管道中,对环氧丙烷-空气两相流云雾及环氧丙烷-铝粉-空气三相流云雾的爆燃转爆轰(DDT)过程进行了实验研究。对弱点火条件下多相混和物DDT过程的不同阶段特征进行了分析,对比研究了不同浓度时混和物的燃爆情况。结果表明:浓度为513 g/m3的环氧丙烷-空气混和物及浓度为237和643 g/m3的环氧丙烷-铝粉-空气混和物均能在管道中完成爆燃向爆轰的转变,进入自持爆轰阶段,其胞格尺寸分别为0.28和0.50 m。

Motivated by the current interest in the mechanism of the deflagration to detonation transition （DDT）,the DDT experiments of epoxypropane-air mixture and epoxypropane-aluminum-air mixture are carried out by a large-scale tube （32.4 m long and 0. 199 inner diameter）. The processes of DDT in multi-phase clouds are analyzed,and the mixtures with different concentrations are compared. The self-sustained detonation waves are formed in the epoxypropane-air mixture with epoxypropane concentration of 513 g/m3 and epoxypropane-aluminum-air mixture with epoxypropane and aluminum concentrations of 237 and 643 g/m3 ,and moreover the cell size of the detonation are 0.28 and 0.5 m, respectively.