We report experimental evidence of thermoacoustic bistability in a lab-scale turbulent combustor over a well-defined range of fuel–air equivalence ratios. Pressure oscillations are characterized by an intermittent behavior with “bursts,” i.e., sudden jumps between low and high amplitudes occurring at random time instants. The corresponding probability density functions (PDFs) of the acoustic pressure signal show clearly separated maxima when the burner is operated in the bistable region. The gain and phase between acoustic pressure and heat release rate fluctuations are evaluated at the modal frequency from simultaneously recorded flame chemiluminescence and acoustic pressure. The representation of the corresponding statistics is new and particularly informative. It shows that the system is characterized, in average, by a nearly constant gain and by a drift of the phase as function of the oscillation amplitude. This finding may suggest that the bistability does not result from an amplitude-dependent balance between flame gain and acoustic damping, but rather from the nonconstant phase difference between the acoustic pressure and the coherent fluctuations of heat release rate.
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June 2018
Research-Article
Flame Dynamics Intermittency in the Bistable Region Near a Subcritical Hopf Bifurcation
D. Ebi,
D. Ebi
Laboratory for Thermal Processes
and Combustion,
Paul Scherrer Institute,
Villigen 5232, Switzerland
e-mail: dominik.ebi@psi.ch
and Combustion,
Paul Scherrer Institute,
Villigen 5232, Switzerland
e-mail: dominik.ebi@psi.ch
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A. Denisov,
A. Denisov
Institute of Thermal and Fluid Engineering,
School of Engineering Hochschule für
Technik FHNW,
Windisch 5210, Switzerland
e-mail: alexey.denisov@fhnw.ch
School of Engineering Hochschule für
Technik FHNW,
Windisch 5210, Switzerland
e-mail: alexey.denisov@fhnw.ch
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G. Bonciolini,
G. Bonciolini
CAPS Laboratory,
Mechanical and Process
Engineering Department,
ETH Zürich, Zürich 8092, Switzerland
Mechanical and Process
Engineering Department,
ETH Zürich, Zürich 8092, Switzerland
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E. Boujo,
E. Boujo
CAPS Laboratory,
Mechanical and Process
Engineering Department,
ETH Zürich,
Zürich 8092, Switzerland
Mechanical and Process
Engineering Department,
ETH Zürich,
Zürich 8092, Switzerland
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N. Noiray
N. Noiray
CAPS Laboratory,
Mechanical and Process
Engineering Department,
ETH Zürich,
Zürich 8092, Switzerland
e-mail: noirayn@ethz.ch
Mechanical and Process
Engineering Department,
ETH Zürich,
Zürich 8092, Switzerland
e-mail: noirayn@ethz.ch
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D. Ebi
Laboratory for Thermal Processes
and Combustion,
Paul Scherrer Institute,
Villigen 5232, Switzerland
e-mail: dominik.ebi@psi.ch
and Combustion,
Paul Scherrer Institute,
Villigen 5232, Switzerland
e-mail: dominik.ebi@psi.ch
A. Denisov
Institute of Thermal and Fluid Engineering,
School of Engineering Hochschule für
Technik FHNW,
Windisch 5210, Switzerland
e-mail: alexey.denisov@fhnw.ch
School of Engineering Hochschule für
Technik FHNW,
Windisch 5210, Switzerland
e-mail: alexey.denisov@fhnw.ch
G. Bonciolini
CAPS Laboratory,
Mechanical and Process
Engineering Department,
ETH Zürich, Zürich 8092, Switzerland
Mechanical and Process
Engineering Department,
ETH Zürich, Zürich 8092, Switzerland
E. Boujo
CAPS Laboratory,
Mechanical and Process
Engineering Department,
ETH Zürich,
Zürich 8092, Switzerland
Mechanical and Process
Engineering Department,
ETH Zürich,
Zürich 8092, Switzerland
N. Noiray
CAPS Laboratory,
Mechanical and Process
Engineering Department,
ETH Zürich,
Zürich 8092, Switzerland
e-mail: noirayn@ethz.ch
Mechanical and Process
Engineering Department,
ETH Zürich,
Zürich 8092, Switzerland
e-mail: noirayn@ethz.ch
1Corresponding author.
Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received August 10, 2017; final manuscript received August 28, 2017; published online January 17, 2018. Editor: David Wisler.
J. Eng. Gas Turbines Power. Jun 2018, 140(6): 061504 (6 pages)
Published Online: January 17, 2018
Article history
Received:
August 10, 2017
Revised:
August 28, 2017
Citation
Ebi, D., Denisov, A., Bonciolini, G., Boujo, E., and Noiray, N. (January 17, 2018). "Flame Dynamics Intermittency in the Bistable Region Near a Subcritical Hopf Bifurcation." ASME. J. Eng. Gas Turbines Power. June 2018; 140(6): 061504. https://doi.org/10.1115/1.4038326
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