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TECHNICAL PAPERS: Gas Turbines: Combustion and Fuels

Self-Excited Oscillations in Combustors With Spray Atomizers

[+] Author and Article Information
M. Zhu, A. P. Dowling, K. N. C. Bray

Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK

J. Eng. Gas Turbines Power 123(4), 779-786 (Oct 01, 2000) (8 pages) doi:10.1115/1.1376717 History: Received October 01, 1999; Revised October 01, 2000
Copyright © 2001 by ASME
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References

Figures

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Schematic diagram of the geometry
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Contour plot of the mean temperature distribution at idle conditions. The black line indicates the mean position of the stoichiometric curve.
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The time traces of the static pressure and droplet Sauter mean diameter (SMD) at atomizer outlet during the transition period of computational fluid dynamics (CFD) calculations without the choking condition
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The time traces of the static pressure and droplet Sauter mean diameter (SMD) at atomizer outlet during the transition period of computational fluid dynamics (CFD) calculations with the choking condition
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The variation of the area-averaged rate of heat release/unit length due to the self-excited oscillations in the combustor. The changes of the static pressure and Sauter mean diameter (SMD) in the atomizer are shown in (a) and (b), respectively.
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The transfer function between the heat release rate per unit length and the inlet air mass flow rate in the frequency of the self-excited oscillation (50 Hz)
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The self-excited oscillations of the static pressure, mixture fraction, heat release rate, and entropy at the sample point in combustion zone. The variations of the air mass flow rate and Sauter mean diameter (SMD) in the atomizer are indicated in (a) where the green and blue lines indicate the SMD and the air mass flow rate, respectively.
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The self-excited oscillations of the static pressure, mixture fraction, heat release rate, and entropy at the outlet. The variations of the air mass flow rate and Sauter mean diameter (SMD) in the atomizer are indicated in (a), where the green and blue lines indicate the SMD and the air mass flow rate, respectively.
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The propagation of the entropy wave along the main stream flow
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The propagation of the pressure wave along the main stream flow

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