Experimental research of deflagration to detonation transition of epoxypropane-aluminum-air mixtures in large-scale tube

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.