A Skewed PDF Combustion Model for Jet Diffusion Flames

[+] Author and Article Information
M. M. M. Abou-Ellail, H. Salem

Department of Mechanical Engineering, Cairo University, Cairo, Egypt

J. Heat Transfer 112(4), 1002-1007 (Nov 01, 1990) (6 pages) doi:10.1115/1.2910471 History: Received March 28, 1989; Revised October 17, 1989; Online May 23, 2008


A combustion model based on restricted chemical equilibrium is described. A transport equation for the skewness of the mixture fraction is derived. It contains two adjustable constants. The computed values of the mean mixture fraction (f ) and its variance and skewness (g and s ) for a jet diffusion methane flame are used to obtain the shape of a skewed pdf. The skewed pdf is split into a turbulent part (beta function) and a nonturbulent part (delta function) at f = 0. The contribution of each part is directly related to the values of f , g , and s . The inclusion of intermittency in the skewed pdf appreciably improves the numerical predictions obtained for a turbulent jet diffusion methane flame for which experimental data are available.

Copyright © 1990 by The American Society of Mechanical Engineers
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