Accession Number : AD0621214

Title :   EXPERIMENTAL STUDY OF WAVE PHENOMENA ASSOCIATED WITH THE ONSET OF GASEOUS DETONATION,

Corporate Author : CALIFORNIA UNIV BERKELEY INST OF ENGINEERING RESEARCH

Personal Author(s) : Urtiew,P. A.

Report Date : FEB 1965

Pagination or Media Count : 130

Abstract : 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)

Descriptors :   (*DETONATION WAVES, BOUNDARY LAYER TRANSITION), (*FLUID MECHANICS, DETONATION WAVES), (*COMBUSTION, BOUNDARY LAYER TRANSITION), EXPLOSION EFFECTS, DEFLAGRATION, MIXTURES, EXPLOSIVE GASES, OXYGEN, HYDROGEN, BOUNDARY LAYER, SOUND, SCHLIEREN PHOTOGRAPHY

Distribution Statement : APPROVED FOR PUBLIC RELEASE