TY - JOUR
T1 - Flame propagation and extinction in large-scale vortical flows
AU - Kagan, L.
AU - Sivashinsky, G.
N1 - Funding Information:
These studies were supported in part by the U.S. Department of Energy under Grant No. DE-FG02-88ER1382, Grant No. CTS-9521084, by the U.S.–Israel Binational Science Foundation under Grant No. 95-00011, by the Israel Science Foundation under Grant No. 15-95, by the Israel Ministry of Science under Grant No. 9685-1-97, by the Belfer Foundation for Energy Research, and by the European Community Programs INTAS-961173 and TMR-ERB4061 PL97-0159. The numerical simulations were performed at the Israel Inter University Computer Center. The authors thank Professor D. Bradley for valuable comments on the first draft of the manuscript.
PY - 2000/1
Y1 - 2000/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0344183007&partnerID=8YFLogxK
U2 - 10.1016/S0010-2180(99)00090-5
DO - 10.1016/S0010-2180(99)00090-5
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AN - SCOPUS:0344183007
SN - 0010-2180
VL - 120
SP - 222
EP - 232
JO - Combustion and Flame
JF - Combustion and Flame
IS - 1-2
ER -