Abstract

This study investigates the impact of the staging factor, the ratio between the fuel injected through the pilot stage and the multipoint injection, on the flame dynamic. The BIMER combustor is an atmospheric pressure rig equipped with two corotating swirling air injections (a fixed amount of around 87% of the air goes inside the multipoint stage) and two fuel injection paths for staged combustion. Liquid dodecane is injected with air preheated at 437 K with a global equivalence ratio of 0.6 and a thermal power of around 72 kW. The change of the staging factor from 100% (pilot-only injection) toward 0% (multipoint-only injection) generates changes in the flame-shape which bifurcates from an anchored V-flame into a lifted flame. This flame shape bifurcation appears at a staging of factor around 25%. Around this staging factor, one can witness multistable flames where the flame structure transits randomly between five different states. Processing microphone signals recorded in the chamber provides an understanding of the flame dynamics. The attached flame presents limited pressure fluctuations level at 270 Hz, while the lifted flame features high-pressure fluctuations at 323 Hz. The intermittency between the five states (including the two stable states) is investigated.

References

1.
Lefebvre
,
A. H.
, and
Ballal
,
D. R.
,
2010
,
Gas Turbine Combustion: Alternative Fuels and Emissions
,
CRC Press
,
Boca Raton, FL
.
2.
Huang
,
Y.
, and
Yang
,
V.
,
2009
, “
Dynamics and Stability of Lean-Premixed Swirl-Stabilized Combustion
,”
Prog. Energy Combust. Sci.
,
35
(
4
), pp.
293
364
.10.1016/j.pecs.2009.01.002
3.
Poinsot
,
T.
,
2017
, “
Prediction and Control of Combustion Instabilities in Real Engines
,”
Proc. Combust. Inst.
,
36
(
1
), pp.
1
28
.10.1016/j.proci.2016.05.007
4.
Kim
,
K.
, and
Hochgreb
,
S.
,
2011
, “
The Nonlinear Heat Release Response of Stratified Lean-Premixed Flames to Acoustic Velocity Oscillations
,”
Combust. Flame
,
158
(
12
), pp.
2482
2499
.10.1016/j.combustflame.2011.05.016
5.
Hermeth
,
S.
,
Staffelbach
,
G.
,
Gicquel
,
L. Y.
,
Anisimov
,
V.
,
Cirigliano
,
C.
, and
Poinsot
,
T.
,
2014
, “
Bistable Swirled Flames and Influence on Flame Transfer Functions
,”
Combust. Flame
,
161
(
1
), pp.
184
196
.10.1016/j.combustflame.2013.07.022
6.
Culler
,
W.
,
Chen
,
X.
,
Samarasinghe
,
J.
,
Peluso
,
S.
,
Santavicca
,
D.
, and
O'Connor
,
J.
,
2018
, “
The Effect of Variable Fuel Staging Transients on Self-Excited Instabilities in a Multiple-Nozzle Combustor
,”
Combust. Flame
,
194
, pp.
472
484
.10.1016/j.combustflame.2018.04.025
7.
Han
,
X.
,
Laera
,
D.
,
Morgans
,
A.
,
Sung
,
C.
,
Hui
,
X.
, and
Lin
,
Y.
,
2019
, “
Flame Macrostructures and Thermoacoustic Instabilities in Stratified Swirling Flames
,”
Proc. Combust. Inst.
,
37
(
4
), pp.
5377
5384
.10.1016/j.proci.2018.06.147
8.
Durox
,
D.
,
Schuller
,
T.
,
Noiray
,
N.
, and
Candel
,
S.
,
2009
, “
Experimental Analysis of Nonlinear Flame Transfer Functions for Different Flame Geometries
,”
Proc. Combust. Inst.
,
32
(
1
), pp.
1391
1398
.10.1016/j.proci.2008.06.204
9.
Kabiraj
,
L.
, and
Sujith
,
R. I.
,
2012
, “
Nonlinear Selfexcited Thermoacoustic Oscillations: Intermittency and Flame Blowout
,”
J. Fluid Mech.
,
713
, pp.
376
397
.10.1017/jfm.2012.463
10.
Patat
,
C.
,
Baillot
,
F.
,
Blaisot
,
J.-B.
,
Domingues
,
É.
,
Vignat
,
G.
,
Soundararajan
,
P. R.
,
Renaud
,
A.
,
Durox
,
D.
, and
Candel
,
S.
,
2023
, “
Swirling Spray Flames Dynamical Blow Out Induced by Transverse Acoustic Oscillations
,”
Proc. Combust. Inst.
,
39
(
4
), pp.
4651
4659
.10.1016/j.proci.2022.08.029
11.
Renaud
,
A.
,
Ducruix
,
S.
, and
Zimmer
,
L.
,
2017
, “
Bistable Behaviour and Thermo-Acoustic Instability Triggering in a Gas Turbine Model Combustor
,”
Proc. Combust. Inst.
,
36
(
3
), pp.
3899
3906
.10.1016/j.proci.2016.08.007
12.
Zhang
,
Z.
,
Liu
,
X.
,
Gong
,
Y.
,
Yang
,
Y.
,
Tang
,
Z.
,
Liu
,
G.
,
Deng
,
F.
,
Yang
,
J.
, and
Zheng
,
H.
,
2020
, “
Experimental Study of Stratified Swirl Flame Dynamics in a Model Gas Turbine Combustor
,”
Energy
,
211
, p.
118699
.10.1016/j.energy.2020.118699
13.
Dhanuka
,
S. K.
,
Temme
,
J. E.
,
Driscoll
,
J. F.
, and
Mongia
,
H. C.
,
2009
, “
Vortex-Shedding and Mixing Layer Effects on Periodic Flashback in a Lean Premixed Prevaporized Gas Turbine Combustor
,”
Proc. Combust. Inst.
,
32
(
2
), pp.
2901
2908
.10.1016/j.proci.2008.06.155
14.
Yin
,
Z.
, and
Stöhr
,
M.
,
2020
, “
Time–Frequency Localization of Intermittent Dynamics in a Bistable Turbulent Swirl Flame
,”
J. Fluid Mech.
,
882
, p.
A30
.10.1017/jfm.2019.762
15.
Schmid
,
P. J.
,
2011
, “
Application of the Dynamic Mode Decomposition to Experimental Data
,”
Exp. Fluids
,
50
(
4
), pp.
1123
1130
.10.1007/s00348-010-0911-3
16.
Renaud
,
A.
,
Ducruix
,
S.
, and
Zimmer
,
L.
,
2019
, “
Experimental Study of the Precessing Vortex Core Impact on the Liquid Fuel Spray in a Gas Turbine Model Combustor
,”
ASME J. Eng. Gas Turbines Power
, 141(11), p.
111022
.10.1115/1.4044998
17.
Moeck
,
J. P.
,
Bourgouin
,
J.-F.
,
Durox
,
D.
,
Schuller
,
T.
, and
Candel
,
S.
,
2012
, “
Nonlinear Interaction Between a Precessing Vortex Core and Acoustic Oscillations in a Turbulent Swirling Flame
,”
Combust. Flame
,
159
(
8
), pp.
2650
2668
.10.1016/j.combustflame.2012.04.002
18.
Providakis
,
T.
,
Zimmer
,
L.
,
Scouflaire
,
P.
, and
Ducruix
,
S.
,
2012
, “
Characterization of the Acoustic Interactions in a Two-Stage Multi-Injection Combustor Fed With Liquid Fuel
,”
ASME J. Eng. Gas Turbines Power
,
134
(
11
), p.
09
.10.1115/1.4007200
19.
Santhosh
,
R.
,
Miglani
,
A.
, and
Basu
,
S.
,
2014
, “
Transition in Vortex Breakdown Modes in a Coaxial Isothermal Unconfined Swirling Jet
,”
Phys. Fluids
,
26
(
4
), p.
043601
.10.1063/1.4870016
20.
Moise
,
P.
, and
Mathew
,
J.
,
2021
, “
Hysteresis and Turbulent Vortex Breakdown in Transitional Swirling Jets
,”
J. Fluid Mech.
,
915
, p. A94.10.1017/jfm.2021.118
21.
Keeton
,
B. W.
,
Nomura
,
K. K.
,
Sánchez
,
A. L.
, and
Williams
,
F. A.
,
2023
, “
Vortex Breakdown in Swirling Burke–Schumann Flames
,”
Proc. Combust. Inst.
,
39
(
2
), pp.
1635
1645
.10.1016/j.proci.2022.07.013
22.
Schuller
,
T.
,
Poinsot
,
T.
, and
Candel
,
S.
,
2020
, “
Dynamics and Control of Premixed Combustion Systems Based on Flame Transfer and Describing Functions
,”
J. Fluid Mech.
,
894
, p. P1.10.1017/jfm.2020.239
23.
Soundararajan
,
P. R.
,
Durox
,
D.
,
Renaud
,
A.
,
Vignat
,
G.
, and
Candel
,
S.
,
2022
, “
Swirler Effects on Combustion Instabilities Analyzed With Measured FDFS, Injector Impedances and Damping Rates
,”
Combust. Flame
,
238
, p.
111947
.10.1016/j.combustflame.2021.111947
You do not currently have access to this content.