We investigate numerically the effect of heat loss and strain rate on the premixed flame edges encountered in a two-dimensional counterflow configuration for Lewis number higher than one. Under nonadiabatic conditions, multiple flame edges and multiple propagation speeds (positive and negative) are discussed. Different regions of multiple propagation speeds have been revealed ranging from two to four, depending on the value of the heat loss parameter and Damkohler number, which is inversely proportional to the strain rate. A combustion wave is modeled by connecting a strongly burning flame on one side of the burner to a weakly burning flame on the other side. These combustion waves are changing with increasing Dam number into flame edges with the fact that the strongly burning flame is the dominant.

References

References
1.
Daou
,
R.
,
Daou
,
J.
, and
Dold
,
J.
,
2003
, “
The Effect of Heat Loss on Flame-Edges in a Premixed Counterflow
,”
Combust. Theory Modell.
,
7
(
2
), pp.
221
242
.
2.
Thatcher
,
R. W.
, and
Al Sarairah
,
E.
,
2007
, “
Steady and Unsteady Flame Propagation in a Premixed Counterflow
,”
Combust. Theory Modell.
,
11
(
4
), pp.
569
583
.
3.
Daou, R., Daou, J., and Dold, J., 2004, “
The Effect of Heat Loss on Flame Edges in a Non-Premixed Counterflow Within a Thermo-Diffusive Model
,”
Combust. Theory Modell.
,
8
(
4
), pp.
683
699
.
4.
Buckmaster
,
J.
,
1997
, “
The Effects of Radiation on Stretched Flames
,”
Combust. Theory Modell.
,
1
(
1
), pp.
1
11
.
5.
Ju
,
Y.
,
Guo
,
H.
,
Maruta
,
K.
, and
Liu
,
F.
,
1997
, “
On the Extinction Limit and Flammability Limit of Non-Adiabatic Stretched Methane-Air Premixed Flames
,”
J. Fluid Mech.
,
342
, pp.
315
334
.
6.
Buckmaster
,
J.
,
2002
, “
Edge-Flames
,”
Prog. Energy Combust. Sci.
,
28
(
5
), pp.
435
475
.
7.
Thatcher
,
R. W.
, and
Omon
,
A. A.
,
2005
, “
Multiple Speeds of Flame Edge Propagation for Lewis Number Above One
,”
Combust. Theory Modell.
,
9
(
4
), pp.
647
658
.
8.
Ronney
,
P. D.
,
2001
,
Premixed-Gas Flames in Microgravity Combustion
,
H.
Ross
, Ed.,
Academic Press
,
London
, pp.
35
82
.
9.
Buckmaster
,
J.
, and
Short
,
M.
,
1999
, “
Cellular Instabilities, Sublimit Structures and Edge-Flames in Premixed Counterflows
,”
Combust. Theory Modell.
,
3
(
1
), pp.
199
214
.
10.
Kadowaki
,
S.
, and
Oshashi
,
H.
,
2013
, “
Shape and Fluctuation of Cellular Premixed Flames: Lean Combustion System of CH4/O2/CO2 Mixtures
,”
J. Visualization
,
16
(
1
), pp.
5
8
.
11.
Thatcher
,
R. W.
, and
Dold
,
J. D.
,
2000
, “
Edges of Flames That Do Not Exist: Flame Edge Dynamics in a Non-Premixed Counterflow
,”
Combust. Theory Modell.
,
4
(
4
), pp.
435
457
.
12.
Thatcher
,
R. W.
,
Omon-Arancibia
,
A.
, and
Dold
,
J. W.
,
2002
, “
Oscillatory Flame Edge Propagation, Isolated Flame Tubes and Stability in a Non-Premixed Counterflow
,”
Combust. Theory Modell.
,
6
(
3
), pp.
487
502
.
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