Species Concentrations and Turbulence Properties in Buoyant Methane Diffusion Flames

[+] Author and Article Information
S-M. Jeng, G. M. Faeth

Department of Mechanical Engineering, The Pennsylvania State University, University Park, Pa. 16802

J. Heat Transfer 106(4), 721-727 (Nov 01, 1984) (7 pages) doi:10.1115/1.3246744 History: Received August 25, 1983; Online October 20, 2009


Past measurements of mean velocities and temperatures in buoyant turbulent, axisymmetric methane diffusion flames burning in still air have been extended to include mean species concentrations (CH4 , N2 , O2 , CO2 , H2 O, CO, and H2 ) and turbulence quantities. The new measurements were used to evaluate a Favre-averaged, k-ε-g turbulence model of the process—with all empirical constants fixed by measurements in noncombusting flows. Use of the laminar flamelet method to treat scalar properties yielded reasonably good predictions of mean properties. Turbulence predictions were less satisfactory, generally underestimating fluctuation levels and Reynolds stresses in highly buoyant regions of the flows. Measurements indicated significant anisotropy of turbulence properties in the same regions. These findings suggest the need for multistress closure to adequately model turbulence properties in buoyant flames.

Copyright © 1984 by ASME
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