Abstract
The present paper deals with the transition from deflagration to detonation and the detonation structure in organic dust fuel-gas oxidizer mixtures in tube. The complete process of detonation evolution can be distinguished in four stages: 1. initial partial ignition; 2. pressure wave amplification by coherent energy release; 3. unsteady reaction shock; and 4. spin detonation. By decreasing the initiation energy the monotonic acceleration in stage 2 turns into a multistage one. The three- dimensional structure of the detonation wave front forms within the stage of the “reaction shock” in which a shock front is closely coupled with the reaction zone behind it. In this stage, an abrupt violent onset of detonation, as observed in gaseous mixtures, in some cases occurs. The spin structure exists in both the periphery and the interior region of the cross section. The detailed description of the structure shows that transverse waves play a dominant role in stable detonation propagation in those heterogeneous mixtures.
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Zhang, F., Grȍnig, H. (1991). Transition and Structure of Dust Detonations. In: Borissov, A.A. (eds) Dynamic Structure of Detonation in Gaseous and Dispersed Media. Fluid Mechanics and Its Applications, vol 5. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3548-1_7
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DOI: https://doi.org/10.1007/978-94-011-3548-1_7
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