Flame propagation and extinction in large-scale vortical flows

L. Kagan, G. Sivashinsky*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

It is shown that the propagation speed of the premixed gas flame spreading through a time-independent, space-periodic array of large-scale vorticities is a nonmonotonic function of their intensity. For moderately strong vorticities their intensification results in the flame speed enhancement accompanied by shedding of islands of unburned gas. Yet there is a certain level of stirring at which the flame speed reaches its maximum. Any further increase in the stirring intensity leads to a drop in the flame speed, followed, for mildly nonadiabatic systems, by flame extinction. The relation of these findings to the classical theory of planar counterflow flames is discussed. The study is motivated by the experimentally known phenomenon of flame extinction by turbulence.

Original languageEnglish
Pages (from-to)222-232
Number of pages11
JournalCombustion and Flame
Volume120
Issue number1-2
DOIs
StatePublished - Jan 2000

Funding

FundersFunder number
Belfer Foundation for Energy ResearchINTAS-961173, TMR-ERB4061 PL97-0159
Israel Ministry of Science9685-1-97
U.S. Department of EnergyCTS-9521084, DE-FG02-88ER1382
United States-Israel Binational Science Foundation95-00011
Israel Science Foundation15-95

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