Critical phenomena in the cellular mode of filtration combustion in the presence of heat loss |
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Authors: | K G Shkadinskii A N Firsov N I Ozerkovskaya |
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Institution: | 1.Institute of Problems of Chemical Physics,Russian Academy of Sciences,Chernogolovka, Moscow oblast,Russia;2.Institute of Structural Macrokinetics and Problems of Materials,Russian Academy of Science,Chernogolovka, Moscow Oblast,Russia |
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Abstract: | Critical conditions for combustion failure due to heat loss to the environment are examined. The process of filtration combustion
is considered under conditions where a cellular structure of the front is realized, because the planar combustion front loses
its stability and splits into separate cells of exothermic chemical conversion, which propagate in self-sustained mode. The
size and structure of the cells of chemical interaction depend nonlinearly on the governing parameters, including the rate
of heat loss to the environment. Within the framework of a mathematical model of filtration combustion, the steady-state dynamics
of the combustion process and the structure of the cell of exothermic chemical reaction of a powder mixture with a gaseous
reagent with the formation of solid products are simulated. The specifics of the evolution of the cell before combustion failure
as a function of the heat loss rate are studied. |
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