This article reports experiments carried out in the MICCA-spray combustor developed at EM2C laboratory. This system comprises 16 swirl spray injectors. Liquid n-heptane is injected by simplex atomizers. The combustion chamber is formed by two cylindrical quartz tubes allowing full optical access to the flame region and it is equipped with 12 pressure sensors recording signals in the plenum and chamber. A high-speed camera provides images of the flames and photomultipliers record the light intensity from different flames. For certain operating conditions, the system exhibits well defined instabilities coupled by the first azimuthal mode of the chamber at a frequency of 750 Hz. These instabilities occur in the form of bursts. Examination of the pressure and the light intensity signals gives access to the acoustic energy source term. Analysis of the phase fluctuations between the two signals is carried out using cross-spectral analysis. At limit cycle, large pressure fluctuations of 5000 Pa are reached, and these levels persist over a finite period of time. Analysis of the signals using the spin ratio indicates that the standing mode is predominant. Flame dynamics at the pressure antinodal line reveals a strong longitudinal pulsation with heat release rate oscillations in phase and increasing linearly with the acoustic pressure for every oscillation levels. At the pressure nodal line, the flames are subjected to large transverse velocity fluctuations leading to a transverse motion of the flames and partial blow-off. Scenarios and modeling elements are developed to interpret these features.

References

References
1.
Noiray
,
N.
,
Bothien
,
M.
, and
Schuermans
,
B.
,
2011
, “
Investigation of Azimuthal Staging Concepts in Annular Gas Turbines
,”
Combust. Theory Model.
,
15
(
5
), pp.
585
606
.
2.
Camporeale
,
S. M.
,
Fortunato
,
B.
, and
Campa
,
G.
,
2011
, “
A Finite Element Method for Three-Dimensional Analysis of Thermo-Acoustic Combustion Instability
,”
ASME J. Eng. Gas Turbines Power
,
133
(
1
), p.
011506
.
3.
Campa
,
G.
, and
Camporeale
,
S. M.
,
2014
, “
Prediction of the Thermoacoustic Combustion Instabilities in Practical Annular Combustors
,”
ASME J. Eng. Gas Turbines Power
,
136
(
9
), p.
091504
.
4.
Bauerheim
,
M.
,
Parmentier
,
J.-F.
,
Salas
,
P.
,
Nicoud
,
F.
, and
Poinsot
,
T.
,
2014
, “
An Analytical Model for Azimuthal Thermoacoustic Modes in an Annular Chamber Fed by an Annular Plenum
,”
Combust. Flame
,
161
(
5
), pp.
1374
1389
.
5.
Bauerheim
,
M.
,
Salas
,
P.
,
Nicoud
,
F.
, and
Poinsot
,
T.
,
2014
, “
Symmetry Breaking of Azimuthal Thermo-Acoustic Modes in Annular Cavities: A Theoretical Study
,”
J. Fluid Mech.
,
760
, pp.
431
465
.
6.
Ghirardo
,
G.
,
Juniper
,
M.
, and
Moeck
,
J. P.
,
2015
, “
Stability Criteria Forr Standing and Spinning Waves in Annular Combustors
,”
ASME
Paper No. GT2015-43127.
7.
Ghirardo
,
G.
,
Juniper
,
M. P.
, and
Moeck
,
J. P.
,
2016
, “
Weakly Nonlinear Analysis of Thermoacoustic Instabilities in Annular Combustors
,”
J. Fluid Mech.
,
805
, pp.
52
87
.
8.
Laera
,
D.
,
Prieur
,
K.
,
Durox
,
D.
,
Schuller
,
T.
,
Camporeale
,
S. M.
, and
Candel
,
S.
,
2016
, “
Impact of Heat Release Distribution on the Spinning Modes of an Annular Combustor With Multiple Matrix Burners
,”
ASME
Paper No. GT2016-56309.
9.
Poinsot
,
T.
,
2017
, “
Prediction and Control of Combustion Instabilities in Real Engines
,”
Proc. Combust. Inst.
,
36
(1), pp. 1–28.
10.
Schuermans
,
B.
,
Paschereit
,
C. O.
, and
Monkewitz
,
P.
,
2006
, “
Non-Linear Combustion Instabilities in Annular Gas-Turbine Combustors
,”
AIAA
Paper No. 2006-549.
11.
Noiray
,
N.
, and
Schuermans
,
B.
,
2013
, “
On the Dynamic Nature of Azimuthal Thermoacoustic Modes in Annular Gas Turbine Combustion Chambers
,”
Proc. R. Soc. A
,
469
(2151), p. 20120535.
12.
Evesque
,
S.
,
Polifke
,
W.
, and
Pankiewitz
,
C.
,
2003
, “
Spinning and Azimuthally Standing Acoustic Modes in Annular Combustors
,”
AIAA
Paper No. 2003-3182.
13.
Bourgouin
,
J.-F.
,
Durox
,
D.
,
Moeck
,
J. P.
,
Schuller
,
T.
, and
Candel
,
S.
,
2013
, “
Self-Sustained Instabilities in an Annular Combustor Coupled by Azimuthal and Longitudinal Acoustic Modes
,”
ASME
Paper No. GT2013-95010.
14.
Ghirardo
,
G.
, and
Juniper
,
M.
,
2013
, “
Azimuthal Instabilities in Annular Combustors: Standing and Spinning Modes
,”
Proc. R. Soc. A
,
469
(2157), p. 20130232.
15.
Staffelbach
,
G.
,
Gicquel
,
L. Y. M.
,
Boudier
,
G.
, and
Poinsot
,
T.
,
2009
, “
Large Eddy Simulation of Self Excited Azimuthal Modes in Annular Combustors
,”
Proc. Combust. Inst.
,
32
(
2
), pp.
2909
2916
.
16.
Wolf
,
P.
,
Balakrishnan
,
R.
,
Staffelbach
,
G.
,
Gicquel
,
L. M.
, and
Poinsot
,
T.
,
2012
, “
Using LES to Study Reacting Flows and Instabilities in Annular Combustion Chambers
,”
Flow, Turbul. Combust.
,
88
(
1–2
), pp.
191
206
.
17.
Wolf
,
P.
,
Staffelbach
,
G.
,
Gicquel
,
L.
,
Müller
,
J.-D.
, and
Poinsot
,
T.
,
2012
, “
Acoustic and Large Eddy Simulation Studies of Azimuthal Modes in Annular Combustion Chambers
,”
Combust. Flame
,
159
(
11
), pp.
3398
3413
.
18.
Prieur
,
K.
,
Durox
,
D.
,
Beaunier
,
J.
,
Schuller
,
T.
, and
Candel
,
S.
,
2017
, “
Ignition Dynamics in an Annular Combustor for Liquid Spray and Premixed Gaseous Injection
,”
Proc. Combust. Inst.
,
36
(
3
), pp.
3717
3724
.
19.
O'Connor
,
J.
, and
Lieuwen
,
T.
,
2011
, “
Disturbance Field Characteristics of a Transversely Excited Burner
,”
Combust. Sci. Technol.
,
183
(
5
), pp.
427
443
.
20.
O'Connor
,
J.
, and
Lieuwen
,
T.
,
2012
, “
Further Characterization of the Disturbance Field in a Transversely Excited Swirl-Stabilized Flame
,”
ASME J. Eng. Gas Turbines Power
,
134
(
1
), p.
011501
.
21.
Lespinasse
,
F.
,
Baillot
,
F.
, and
Boushaki
,
T.
,
2013
, “
Responses of v-Flames Placed in an hf Transverse Acoustic Field From a Velocity to Pressure Antinode
,”
C. R. Méc.
,
341
(
1
), pp.
110
120
.
22.
Baillot
,
F.
, and
Lespinasse
,
F.
,
2014
, “
Response of a Laminar Premixed v-Flame to a High-Frequency Transverse Acoustic Field
,”
Combust. Flame
,
161
(
5
), pp.
1247
1267
.
23.
Hauser
,
M.
,
Lorenz
,
M.
, and
Sattelmayer
,
T.
,
2011
, “
Influence of Transversal Acoustic Excitation of the Burner Approach Flow on the Flame Structure
,”
ASME J. Eng. Gas Turbines Power
,
133
(
4
), p.
041501
.
24.
Worth
,
N. A.
, and
Dawson
,
J. R.
,
2013
, “
Self-Excited Circumferential Instabilities in a Model Annular Gas Turbine Combustor: Global Flame Dynamics
,”
Proc. Combust. Inst.
,
34
(
2
), pp.
3127
3134
.
25.
Worth
,
N. A.
, and
Dawson
,
J. R.
,
2013
, “
Modal Dynamics of Self-Excited Azimuthal Instabilities in an Annular Combustion Chamber
,”
Combust. Flame
,
160
(
11
), pp.
2476
2489
.
26.
Bourgouin
,
J.-F.
,
Durox
,
D.
,
Moeck
,
J. P.
,
Schuller
,
T.
, and
Candel
,
S.
,
2015
, “
A New Pattern of Instability Observed in an Annular Combustor: The Slanted Mode
,”
Proc. Combust. Inst.
,
35
(
3
), pp.
3237
3244
.
27.
Bourgouin
,
J.-F.
,
Durox
,
D.
,
Moeck
,
J. P.
,
Schuller
,
T.
, and
Candel
,
S.
,
2014
, “
Characterization and Modelling of a Spinning Thermoacoustic Instability in an Annular Combustor Equipped With Multiple Matrix Injectors
,”
ASME J. Eng. Gas Turbines Power
,
137
(
2
), p.
021503
.
28.
Prieur
,
K.
,
Durox
,
D.
,
Schuller
,
T.
, and
Candel
,
S.
,
2017
, “
A Hysteresis Phenomenon Leading to Spinning or Standing Azimuthal Instabilities in an Annular Combustor
,”
Combust. Flame
,
175
, pp.
283
291
.
29.
Dawson
,
J. R.
, and
Worth
,
N. A.
,
2014
, “
Flame Dynamics and Unsteady Heat Release Rate of Self-Excited Azimuthal Modes in an Annular Combustor
,”
Combust. Flame
,
161
(
10
), pp.
2565
2578
.
30.
Worth
,
N. A.
,
Dawson
,
J. R.
,
Sidey
,
J. A. M.
, and
Mastorakos
,
E.
,
2017
, “
Azimuthally Forced Flames in an Annular Combustor
,”
Proc. Combust. Inst.
,
36
(3), pp. 3783–3790.
31.
O'Connor
,
J.
,
Acharya
,
V.
, and
Lieuwen
,
T.
,
2015
, “
Transverse Combustion Instabilities: Acoustic, Fluid Mechanic, and Flame Processes
,”
Prog. Energy Combust. Sci.
,
49
, pp.
1
39
.
32.
Ranz
,
W. E.
, and
Marshall
,
W. R.
,
1952
, “
Evaporation From Drops
,”
Chem. Eng. Prog
,
48
(3), pp.
141
146
.
33.
Laera
,
D.
, Schuller, T.,
Prieur
,
K.
,
Durox
,
D.
,
Camporeale
,
S. M.
, and
Candel
,
S.
,
2017
, “
Flame Describing Function Analysis of Spinning and Standing Modes in an Annular Combustor and Comparison With Experiments
,”
Combust. Flame
,
184
, pp. 136–152.
34.
Noiray
,
N.
,
Durox
,
D.
,
Schuller
,
T.
, and
Candel
,
S.
,
2008
, “
A Unified Framework for Nonlinear Combustion Instability Analysis Based on the Flame Describing Function
,”
J. Fluid Mech.
,
615
, pp.
139
167
.
35.
Schmid
,
P. J.
,
2010
, “
Dynamic Mode Decomposition of Numerical and Experimental Data
,”
J. Fluid Mech.
,
656
, pp.
5
28
.
36.
Philip
,
M.
,
Boileau
,
M.
,
Vicquelin
,
R.
,
Schmitt
,
T.
,
Durox
,
D.
,
Bourgouin
,
J. F.
, and
Candel
,
S.
,
2014
, “
Simulation of the Ignition Process in an Annular Multiple-Injector Combustor and Comparison With Experiments
,”
ASME J. Eng. Gas Turbines Power
,
137
(
3
), p.
031501
.
You do not currently have access to this content.