Effect of Lewis number on flame propagation through vortical flows

L. Kagan, G. Sivashinsky*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


The premixed gas flame spreading through an array of large-scale vortices is studied numerically. It is found that the flame speed is a nonmonotonic function of the stirring intensity. At sufficiently low Lewis numbers (Le<1) the system becomes bistable with a hysteretic transition between possible propagation modes. In the presence of volumetric heat losses the stirring invariably promotes extinction (reduces the flammability limits), provided Le>1. At Le<1 this holds only for sufficiently strong stirring, whereas moderate stirring actually expands the flammability limits. At Le>1 the deficient reactant is fully consumed up to the very quenching point. At Le<1, prior to the total extinction, part of the deficient reactant escapes the reaction zone and remains unconsumed.

Original languageEnglish
Pages (from-to)235-240
Number of pages6
JournalCombustion and Flame
Issue number3
StatePublished - Aug 2005


FundersFunder number
European Community ProgramRTN-NPRN-CT-2002-00274
German-Israel FoundationG-695-15.10/2001
United States-Israel Binational Science Foundation2002008
Israel Science Foundation278-03, 67-01


    • Flame-flow interaction
    • Flammability limits
    • Turbulent flames


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