Accession Number : AD0769715

Title :   Explosive Reaction of Acetaldehyde with Oxygen,

Corporate Author : BALLISTIC RESEARCH LABS ABERDEEN PROVING GROUND MD

Personal Author(s) : Cohen,Arthur

Report Date : SEP 1973

Pagination or Media Count : 28

Abstract : A shock tube investigation of the explosive reaction of acetaldehyde with oxygen at temperatures between 1200-1800K and pressures between 1-5 atmospheres has been performed using mixtures with equivalence ratios of 1, .98 and .42. Shock conditions were adjusted so that explosions occurred only in the reflected shock region. Explosion delays were measured by means of a schlieren system and a fast response piezoelectric gage. The temperature and concentration dependence of the delays were compared with predictions based on a kinetic mechanism established at lower temperatures and pressures and under isothermal conditions. By including a unimolecular initiation step, good agreement was attained. The inverse of the delay times have a 3/2 order dependence on acetaldehyde and less than 1/2 dependence on oxygen. The amount of energy released during the delay period is less than 20% of the heat of combustion. The global rate constant for the rate of energy production is given. (Modified author abstract)

Descriptors :   (*ALDEHYDES, EXPLOSIONS), (*EXPLOSIONS, REACTION KINETICS), OXIDATION, COMBUSTION, SHOCK TUBES, CHAIN REACTIONS, IGNITION LAG, EXOTHERMIC REACTIONS, SHOCK WAVES

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE