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RESEARCH PAPERS

Radiative Cooling of a Turbulent Flame Front

[+] Author and Article Information
D. K. Edwards, A. Balakrishnan

Energy and Kinetics Department, University of California, Los Angeles, Calif.

J. Heat Transfer 95(4), 433-438 (Nov 01, 1973) (6 pages) doi:10.1115/1.3450085 History: Received August 14, 1972; Revised February 16, 1973; Online August 11, 2010

Abstract

Temperature profiles arising from simultaneous radiation and turbulent diffusion in combustion gas products in the vicinity of a turbulent flame front are obtained analytically. Account is taken of the highly nongray nature of the gas absorption and emission by use of band absorption properties and slab band absorptance functions. Radiative cooling is shown to be quite effective, not by acting directly upon the eddies themselves at the flame front, but by acting indirectly to cool greatly the gases in the vicinity of the flame front, which in turn cool the eddies through turbulent mixing. Generalized dimensionless results, as well as particularized examples, are presented. It was found that CO2 , being an intense emitter, reduces flame front temperature to a greater degree than H2 O, a less intense emitter, even though the total emissivity of H2 O exceeds that of CO2 . For this reason flue gas recirculation appears more advantageous than water or steam injection in achieving radiative cooling.

Copyright © 1973 by ASME
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