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TECHNICAL PAPERS: Gas Turbines: Combustion and Fuels

Influence of the Combustor Aerodynamics on Combustion Instabilities From Equivalence Ratio Fluctuations

[+] Author and Article Information
T. Sattelmayer

Lehrstuhl A für Thermodynamik, Technische Universität München, Boltzmannstraße 15, D-85748 Garching, Germany

J. Eng. Gas Turbines Power 125(1), 11-19 (Dec 27, 2002) (9 pages) doi:10.1115/1.1365159 History: Received October 01, 1999; Revised October 01, 2000; Online December 27, 2002
Copyright © 2003 by ASME
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References

Keller,  J. J., 1995, “Thermoacoustic Oscillations In Combustion Chambers of Gas Turbines,” AIAA J., 33, No. 12, pp. 2280–2287.
Hubbard, S., and Dowling, A. P., 1998, “Acoustic Instabilities in Premixed Burners,” AIAA 98-2272, 4th AIAA/CEAS Aeroacoustics Conference, Toulouse, France, June 1998.
Polifke, W., Paschereit, C. O., and Döbbeling. K., 1999, “Suppression of Combustion Instabilities Through Destructive Interference of Acoustic and Entropy Waves,” 6th Int. Congress on Sound and Vibration, Copenhagen.
Lieuwen, T., Torres, H., Johnson, C., and Zinn, B. 1999, “A Mechanism of Combustion Instability in Lean Premixed Gas Turbine Combustors,” ASME Paper 99-GT-3.
Davies,  P. O. A. L., 1988, “Practical Flow Duct Acoustics,” J. Sound Vib., 124, p. 91–115.
Deucker, E., 1995, “Ein Beitrag zur Vorausberechnung des akustischen Stabilitätsverhaltens von Gasturbinen-Brennkammern mittels theoretischer und experimenteller Analyze von Brennkammerschwingungent,” VDI Fortschrittsberichte, Reihe 6, No. 317.
Fleifil,  M., , 1996, “Response of a Laminar Premixed Flame to Flow Oscillations: A Kinematic Model and Thermoacoustic Instability Results,” Combust. Flame, 106, pp. 487–510.
Ohtsuka, M., et al., 1998, “Combustion Oscillation Analysis of Premixed Flames at Elevated Pressures,” ASME Paper 98-GT-581.
Peracchio, A. A., and Proscia, W. M., 1998, “Non-Linear Heat-Release/Acoustic Model for Thermoacoustic Instability in Lean Premixed Combustors,” ASME paper 98-GT-269.
Lenz, W., “Die dynamischen Eigenschaften von Flammen und ihr Einfluss auf die Entstehung selbsterregter Brennkammerschwingungen,” dissertation, Universität Karlsruhe, 1980.
Dowling,  A. P., 1997, “Nonlinear Self-Excited Oscillations of a Ducted Flame,” J. Fluid Mech., 346, pp. 271–290.
Marble,  F. E., and Candel,  S. M., 1977, “Acoustic Disturbances from Gas Non-Uniformities Convected through a Nozzle,” J. Sound Vib., 55, No. 2, pp. 225–243.

Figures

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Driving mechanisms for combustion instabilities
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Convection of a scalar field in a tube
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Distribution of the residence time in a premix burner. (a) Radial distribution, (b) probability density distribution.
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Wave damping. (a) Equivalence ratio wave in a premix burner, (b) entropy wave in a combustor.
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Fluctuations of the thermal power at the burner exit. (a) Acoustics, no equivalence ratio fluctuations, (b) no acoustics, equivalence ratio fluctuations, and (c) acoustics and equivalence ratio fluctuations.
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Fluctuations of the thermal power at the burner exit: (a) L1→2=0.03 m, (b) L1→2=0.1 m, (c) L1→2=0.3 m
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Fluctuations of the thermal power at the burner exit: (a) Δτ/τ̄=0 (b) Δτ/τ̄=0.3, (c) Δτ/τ̄=0.8
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Fluctuations of the acoustic velocity downstream of the flame: (a) acoustics, no equivalence ratio fluctuations, (b) no acoustics, equivalence ratio fluctuations, (c) acoustics and equivalence ratio fluctuation
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Fluctuations of the acoustic velocity downstream of the flame: (a) Δτ/τ̄=0, (b) Δτ/τ̄=0.3, (c) Δτ/τ̄=0.8
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Fluctuations of the acoustic velocity downstream of the flame (flame dynamics included): (a) Δτ/τ̄=0, (b) Δτ/τ̄=0.3, (c) Δτ/τ̄=0.8
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Influence of the equivalence ratio fluctuations (Δτ/τ̄) on the stability of the model combustor
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Influence of the entropy fluctuations (Δτ/τ̄) on the stability of the model combustor (w/o dispersion of the equivalence ratio waves)
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Influence of the entropy fluctuations (Δτ/τ̄) on the stability of the model combustor (with dispersion of the equivalence ratio waves)

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