Experimental Study of Wave Phenomena Associated with the Onset of Gaseous Detonation

摘要

The study is concerned with wave processes that occur at the instant of transition from the deflagrative to the detonative mode of propagation of the combustion wave in an explosive gas mixture. Experimental observations were made by means of Schlieren photography with pressure transducer measurements using stoichiometric hydrogen-oxygen mixtures contained initially, under normal pressure and temperature, in a 1 x 1-1/2 inch rectangular, cross-section tube. Theoretical interpretation of experimental results revealed that the transition is promoted by the action of a spherical detonation wave generated by a point explosion ahead of the main combustion zone. Upon reflection from the walls this gives rise to a sound wave system oscillating transversely to the axis of the tube and bounded in the direction of the axis, on one side, by the detonation front propagating into the unburned medium and, on the other, by the retonation shock moving into the burned gas. (Author)