Detonation Waves in Dust Media – A Review

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Authors
  1. Zhang, F.
Corporate Authors
Defence R&D Canada - Suffield, Ralston ALTA (CAN)
Abstract
The current status of understanding of detonation and propagation mechanisms in combustible dust media in tubes is reviewed. Detonation in dust-oxygen or air mixtures can be divided into detonation waves and quasi-detonation waves. Propagation mechanisms of the dust detonation waves are predominated by transverse wave structure. whereas the quasi-detonations are shock-induced combustion waves without transverse wave structure. The quasi-detonation velocities are less than that of the transverse wave mode detonations and are bounded by a lower limit characterized with a constant volume explosion at the sonic plane. However, the available results are too few to be able to draw firm conclusions for the propagation mechanisms of the quasi-detonation modes. While the transverse wave spacing of the detonation waves in dust-air mixtures is at least one order of magnitude larger than that in homogeneous gas mixtures, addition of combustible dust into detonable gases can induce complex hybrid detonation modes. They result from the various interactions between the gas reaction time scales and the additional time scales involved in the mass, momentum and heat transfer between the particles and the gas. Under appropriate combination of the multiple time scales, hybrid detonations and DDT can reduce the detonation cell size and enhance the maximum DDT pressures of the detonable gas itself. The variety of hybrid detonation modes and their propagation mechanisms have been far from thoroughl
Report Number
DRDC-SUFFIELD-SL-2002-017 — Scientific Literature
Date of publication
01 Jan 2002
Number of Pages
14
DSTKIM No
CA033936
CANDIS No
533324
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