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Title: Influence of radiation absorption by microparticles on the flame velocity and combustion regimes

Thermal radiation from hot combustion products has virtually no effect on the flame propagation in a gas medium. We consider a different situation when even a small concentration of microparticles suspended in a gas absorbs the thermal radiation and heats the gas mixture ahead of the combustion wave front by transferring it to the gas. The mixture heating ahead of the flame front can lead either to a moderate increase in the combustion wave velocity for a fast flame or to its significant increase for a slow flame, depending on the gas mixture reactivity and the normal laminar flame velocity. For a slow flame, the heat transfer by radiation from the combustion products can become the dominant mechanism compared to the ordinary molecular thermal conduction that determines the combustion wave structure and velocity. The radiative heating for a spatially nonuniform distribution of particles ahead of the flame front is shown to give rise to a temperature gradient that, in turn, can lead to the ignition of different combustion regimes, depending on the radiation absorption length. In accordance with the Zeldovich gradient mechanism, both deflagration and detonation regimes can be formed in this case. A hydrogen–oxygen flame is used as anmore » example to illustrate the ignition of different combustion wave propagation regimes, depending on the radiation absorption length.« less
Authors:
;  [1] ;  [2]
  1. Russian Academy of Sciences, Joint Institute for High Temperatures (Russian Federation)
  2. Nordita, KTH Royal Institute of Technology and Stockholm University (Sweden)
Publication Date:
OSTI Identifier:
22472189
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 121; Journal Issue: 1; Other Information: Copyright (c) 2015 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION; COMBUSTION PRODUCTS; COMBUSTION WAVES; COMPARATIVE EVALUATIONS; CONCENTRATION RATIO; FLAME PROPAGATION; HEATING; HYDROGEN; LAMINAR FLAMES; MIXTURES; OXYGEN; REACTIVITY; TEMPERATURE GRADIENTS; THERMAL CONDUCTION; THERMAL RADIATION; VELOCITY