FLAME PROPAGATION IN A NONUNIFORM MIXTURE - ANALYSIS OF A PROPAGATING TRIPLE-FLAME

被引:111
作者
HARTLEY, LJ
DOLD, JW
机构
[1] School of Mathematics, University of Bristol, Bristol
关键词
D O I
10.1080/00102209108951775
中图分类号
O414.1 [热力学];
学科分类号
摘要
A situation in which a diffusion flame reaches an end at some position in a medium of non-premixed reactants is studied. The mixing of reactants that takes place ahead of the diffusion flame leads to the formation of a “triple-flame”, a structure which consists of a fuel-rich premixed flame, a fuel-lean premixed flame, and a diffusion flame that starts where the two premixed flames meet. An important property of such an end-point is its ability to propagate. The limits of low heat release, unit Lewis number and large Zel’dovich number are considered. The structure of the triple-flame and the unique relationship between propagation speed and transverse mixture fraction gradient are computed numerically. For the range of values considered here, the end of the diffusion flame is shown to extend itself at a rate that can be substantially reduced, but that remains positive as the gradient of the mixture fraction is increased. © 1991, Taylor & Francis Group, LLC. All rights reserved.
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页码:23 / 46
页数:24
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