Multiple speeds of flame edge propagation for Lewis numbers above one

Edges of diffusion flames in a counterflow burner are examined numerically for Lewis greater than unity. When the speed of propagation is plotted against Damköhler for a range of Lewis a fold bifurcation is observed. It is shown that there exist stable positively and negatively propagating edges for...

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Bibliographic Details
Published in:Combustion theory and modelling 2005-11, Vol.9 (4), p.647-658
Main Authors: Thatcher, R. W., Omon-Arancibia, A. A.
Format: Article
Language:English
Subjects:
Flame edges
Laminar flames
Multiple speeds
Non-premixed combustion
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Summary:Edges of diffusion flames in a counterflow burner are examined numerically for Lewis greater than unity. When the speed of propagation is plotted against Damköhler for a range of Lewis a fold bifurcation is observed. It is shown that there exist stable positively and negatively propagating edges for some Damköhler and Lewis number pairs. It is further shown that changed local conditions can lead to a transition from positive (advancing into the unburnt gasses) to negative (receding) propagation.
ISSN:1364-7830
1741-3559
DOI:10.1080/13647830500261617