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Transition to detonation after a 'Volume Explosion' Oppenheim's experiment validation with a numerical calculation

Dzieminska E., Fukuda M., Hayashi A. K., Tsuboi N.

Archivum Combustionis

2011

Vol. 31 nr 3

187-195

Over many years of research Oppenheim's group performed a lot of experimental work concerning detonation. According to his notes the birth of detonation starts as a smooth-surfaced and spheric ally propagating flame which front wrinkles and accelerates. In a short time it produces compression waves that coalesce into a precursor shock which travels with some distance from the flame. Its structure eventually changes to a turbulent flame, while the surface creates so called 'tulip-shape' form. This phenomenon is associated with pressure waves' generation, which becomes slightly more intense in time as the flame becomes highly turbulent. They merge and form shock fronts. This leads to an 'explosion in the explosion' (appearing in the region of the accelerating flame) [1,2], which would be the last stage of the detonation wave birth, just before deflagration-to-detonation transition (DDT). In the first stages of propagation the reflections of the explosion from the back wall help the flame acceleration but later they have no significant meaning.