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For flame propagation in tubes or channels filled with obstacles, it was observed that deflagration to detonation transition (DDT) occurred mostly in the vicinity of an obstacle. Furthermore, onset of detonation originated near the upstream side of the obstacle. This observation suggests that the interaction between the leading shock front of an accelerated flame with the obstacles along its path plays an important role in the transition process. To understand this interaction, initiation of detonation resulting from a collision of a shock wave with obstacles (repeated baffles and wedge-baffle combination) was studied in a 9 × 9 cm channel containing hydrogen-oxygen mixtures. Stroboscopic schlieren photographs showed that shockfocusing, from shock diffraction and reflection, can create local hot spots capable of causing a strong ignition in the mixtures. If the appropriate conditions are present, the blast wave from the strong ignition develops into a detonation wave. For collision of a shock wave with a wedge-baffle combination in a stoichiometric Hz-O 2 mixture at 7.9 kPa (60 torr) initial pressure, the critical incident shock Mach number was measured to be about 2.25. This criti

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Author

C.K. Chan

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0010-2180)

Published

1995

Language

EN

Field

Engineering (Physical Sciences)