The development of a double flame structure in lifted ethanol spray flames is visualized using OH planar laser-induced fluorescence (PLIF). While the OH images indicate a single reaction zone exists without co-flow, the addition of low-speed co-flow facilitates the formation of a double flame structure that consists of two diverging flame fronts originating at the leading edge of the reaction zone. The outer reaction zone burns steadily in a diffusion mode, and the strained inner flame structure is characterized by both diffusion and partially premixed combustion exhibiting local extinction and re-ignition events.

Issue Section:
Fuels and Combustion Technology
Keywords:
spray coating techniques, combustion, flames, reaction kinetics, laser beam effects, organic compounds, ignition, fluorescence, reaction-diffusion systems
Topics:
Combustion, Diffusion (Physics), Ethanol, Flames, Sprays, Flow (Dynamics), Fluorescence, Ignition
1.
Pitts, W. M., 1988, “Assessment of Theories for the Behavior and Blowout of Lifted Turbulent Jet Diffusion Flames,” Twenty-Second International Symposium on Combustion, The Combustion Institute, Pittsburgh, PA, 22, pp. 809–816.
2.
Onuma
,
Y.
,
Tsuji
,
T.
, and
Ogasawara
,
M.
,
1974
, “
Studies on the Flame Structure of a Spray Burner
,”
Bull. JSME
,
17
(
112
), pp.
1296
–
1304
.
3.
Onuma, Y., and Ogasawara, M., 1975, “Studies on the Structure of a Spray Combustion Flame,” Fifteenth International Symposium on Combustion, The Combustion Institute, Pittsburgh, PA, 15, pp. 453–465.
4.
Friedman
,
J. A.
, and
Renksizbulut
,
M.
,
1999
, “
Investigating a Methanol Spray Flame Interacting With an Annular Air Jet Using Phase-Doppler Interferometry and Planar Laser-Induced Fluorescence
,”
Combust. Flame
,
117
, pp.
661
–
684
.
5.
Cessou
,
A.
, and
Stepowski
,
D.
,
1996
, “
Planar Laser Induced Fluorescence Measurement of [OH] in the Stabilization Stage of a Spray Jet Flame
,”
Combust. Sci. Technol.
,
118
, pp.
361
–
381
.
6.
Cessou
,
A.
,
Goix
,
P.
, and
Stepowski
,
D.
,
1999
, “
Simple Description of the Combustion Structures in the Stabilization Stage of a Spray Jet Flame
,”
Atomization Sprays
,
9
, pp.
1
–
27
.
7.
Plessing
,
T.
,
Terhoeven
,
P.
,
Peters
,
N.
, and
Mansour
,
M. S.
,
1998
, “
An Experimental and Numerical Study of Laminar Triple Flames
,”
Combust. Flame
,
115
, pp.
335
–
353
.
8.
Lefebvre, A. H., 1989, Atomization and Sprays, Hemisphere, New York, Chaps. 5–6.
9.
Rizk
,
N. K.
, and
Lefebvre
,
A. H.
,
1985
, “
Internal Flow Characteristics of Simplex Swirl Atomizers
,”
J. Propul. Power
,
1
, pp.
193
–
199
.
10.
Drallmeier
,
J. A.
, and
Peters
,
J. E.
,
1994
, “
Liquid- and Vapor-Phase Dynamics of a Solid-Cone Pressure Swirl Atomizer
,”
Atomization Sprays
,
4
, pp.
135
–
158
.
11.
Donbar
,
J. M.
,
Driscoll
,
J. F.
, and
Carter
,
C. D.
,
2000
, “
Reaction Zone Structure in Turbulent Nonpremixed Jet Flames—From CH-OH PLIF Images
,”
Combust. Flame
,
122
, pp.
1
–
19
.
12.
Kelman
,
J. B.
, and
Masri
,
A. R.
,
1997
, “
Simultaneous Imaging of Temperature and OH Number Density in Turbulent Diffusion Flames
,”
Combust. Sci. Technol.
,
122
, pp.
1
–
32
.
13.
Tanoff, M. A., Smooke, M. D., Osborne, R. J., Brown, T. M., and Pitz, R. W., 1996, “The Sensitive Structure of Partially Premixed Methane-Air vs. Air Counterflow Flames,” Twenty-Sixth International Symposium on Combustion, The Combustion Institute, Pittsburgh, PA, 26, pp. 1121–1128.
14.
Dieke
,
G. H.
, and
Crosswhite
,
H. M.
,
1962
, “
The Ultraviolet Bands of OH
,”
J. Quant. Spectrosc. Radiat. Transf.
,
2
, pp.
97
–
199
.
15.
Watson
,
K. A.
,
Lyons
,
K. M.
,
Donbar
,
J. M.
, and
Carter
,
C. D.
,
1999
, “
Scalar and Velocity Field Measurements in a Lifted CH4-Air Diffusion Flame
,”
Combust. Flame
,
117
, pp.
257
–
271
.
16.
MacGregor
,
S. A.
,
1991
, “
Air Entrainment in Spray Jets
,”
Int. J. Heat Fluid Flow
,
12
, pp.
279
–
283
.
17.
Kaminski
,
C. F.
,
Bai
,
X. S.
,
Hult
,
J.
,
Dreizler
,
A.
,
Lindenmaier
,
S.
, and
Fuchs
,
L.
,
2000
, “
Flame Growth and Wrinkling in a Turbulent Flow
,”
Appl. Phys. B: Photophys. Laser Chem.
,
71
, pp.
711
–
716
.
18.
Kelman
,
J. B.
,
Eltobaji
,
A. J.
, and
Masri
,
A. R.
,
1998
, “
Laser Imaging in the Stabilization Region of Turbulent Lifted Flames
,”
Combust. Sci. Technol.
,
135
, pp.
117
–
134
.
19.
Continillo
,
G.
, and
Sirignano
,
W. A.
,
1990
, “
Counterflow Spray Combustion Modeling
,”
Combust. Flame
,
81
, pp.
325
–
340
.
20.
Lazaro, B. J., and Lasheras, J. C., 1988, “Droplet Dispersion and Transport Mechanisms in a Turbulent, Free Shear-Layer,” Twenty-Second International Symposium on Combustion, The Combustion Institute, Pittsburgh, PA, 22, pp. 1991–1998.
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