Deflagration to detonation transition in JP-10 mist/air mixtures in a large-scale tube

Deflagration to detonation transitions (DDTs) in JP-10 mist/air mixtures have been studied in a horizontal multiphase combustion and explosion tube with inner diameter of 199 mm and length of 32.8 m. The mist/air mixtures were generated by injecting liquid samples into the experimental tube. Experiments were performed at 298 k and 101 kPa with equivalence ratio ranged from 0.51 to 2.09. The coupling process of deflagration wave with leading shock wave and low-velocity self-sustained detonation were observed in JP-10 mist/air mixture with a concentration of 142.86 g/m³, and the average velocity of the self-sustained detonation wave is 510 m/s, which is as low as 26% of C-J value. The low-velocity detonation in JP-10 mist/air mixture can be explained by the low-volatile property of JP-10 liquid and boundary condition. The leanest and richest critical detonable concentrations were studied. The detonation structure was studied by using pressure sensors array mounted in the wave structure test section. A single-head spin detonation wave front was observed and the cellular structure resulting from the spinning movement of the triple point was analyzed.