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The International Conference on Multiphase Systems, ICMS'2000
Ufa, RUSSIA, June 15-17, 2000

Shock Wave Initiation of Heterogeneous Detonation in Aluminum Particle Aerosuspension

Fedorov A. V., Khmel' T. A.

Institute of Theoretical and Applied Mechanics SB RAS, 630090, Novosibirsk, Russia

The paper focuses on the study of the detonation wave initiation processes in an infinite or finite cloud of aluminum particles dispersed in oxygen. The two-velocity two-temperature model of detonation in aluminum particle aerosuspension is based on the conceptions of mechanics of reacting and relaxing heterogeneous media. It takes into account the particle drag coefficient is supersonic flow and includes the generalized chemical kinetic equation. The model was developed earlier and was verified by the experimental data of Strauss on the detonation velocity -- initial particle concentration relation. Different scenarios of initiation under the shock-wave interaction with the particle cloud of infinite width are revealed depending on the combustion front localization. The initiation criteria are obtained for supported incident shock waves or attenuated by adjacent rarefaction waves. The detonation development and two-dimensional effects at the shock-wave interaction with the particle cloud of finite width are investigated. The detonation structure formation and propagation is observed, although the fluctuations of the combustion zone behind the leading shock wave prevent the stationary detonation regime establishing.

The work is supported by grant INTAS OPEN 97-2027 and the Russian Foundation for Basic Research (grants 99-01-00587 and 00-01-00891).