Fast and slow modes of the propagation of the combustion front in heterogeneous systems |
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Authors: | P S Grinchuk O S Rabinovich A S Rogachev N A Kochetov |
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Institution: | (1) Lykov Institute of Heat and Mass Transfer, Belarussian Academy of Sciences, Minsk, 220072, Belarus;(2) Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia |
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Abstract: | Experimental results are presented in favor of the existence of fast and slow modes of the propagation of the combustion front in diluted heterogeneous mixtures of reactive particles. A theoretical combustion model is proposed to explain the existence of these modes. The transition from the fast to the slow mode, which occurs in a narrow range of the degree of dilution of the mixture by inert powder, is associated with the break of a percolation cluster formed by reagent particles that are in direct contact with each other. After such a break of the cluster, the thermal energy of combusting particles is still insufficient to maintain the combustion wave. A sharp decrease in the front velocity in this case is associated with the necessity of heating inert regions inevitably appearing in its path. |
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