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TECHNICAL PAPERS: Gas Turbines: Combustion and Fuel

Sub-Scale Demonstration of the Active Feedback Control of Gas-Turbine Combustion Instabilities

[+] Author and Article Information
Stanley S. Sattinger

Siemens-Westinghouse Power Corporation, Science & Technology Center, 1310 Beulah Road, Pittsburgh, PA 15235

Yedidia Neumeier, Aharon Nabi, Ben T. Zinn

Georgia Institute of Technology, School of Aerospace Engineering, Atlanta, GA 30332

David J. Amos, Douglas D. Darling

Siemens-Westinghouse Power Corporation, Orlando, FL 32826

J. Eng. Gas Turbines Power 122(2), 262-268 (Jan 03, 2000) (7 pages) doi:10.1115/1.483204 History: Received March 08, 1998; Revised January 03, 2000
Copyright © 2000 by ASME
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References

Figures

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Sub-scale combustion stabilization test section. Plenums at the upstream and downstream ends decouple the combustor acoustically from the air supply and exhaust lines.
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Enlarged view of combustor portion of test section
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Schematic of the active control system
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Acoustic impedance model used to calculate natural acoustic modes and frequency-response quantities for the test section. (a) Detailed model. (b) Impedence elements combined upstream and downstream of the volume-velocity source. (c) Upstream and downstream impedances combined.
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Typical “waterfall” frequency-spectrum plot of combustion-chamber pressure oscillations (Transducer P1) for the lower-frequency (230 Hz vicinity) and upper-frequency (550 Hz vicinity) instabilities of the combustor without active control
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Sample time histories and frequency spectra of combustion-chamber pressure fluctuations in open-loop active control tests (Transducer P1). (a) With no modulation of auxiliary fuel flow. (b) With modulation of auxiliary fuel flow at 200 Hz. (c) With modulation of auxiliary fuel flow at 800 Hz.
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Sample time histories of pressure fluctuations in closed-loop control tests without and with active control. The major reduction in amplitude level occurs less than 100 ms after the ACS is activated. (a) Raw signal from Transducer P1 without and with active control. (b) RMS level of mixed signals from Transducers P1 and P2 without and with active control.
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Servocontrol-loop model of acoustically coupled combustion dynamics in a compact-flame, premix combustor. Auxiliary fuel flow modulation is represented as an optional input to the system.
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Variation of the magnitude and phase of the acoustic frequency-response functions with axial position at the lower-frequency instability (196-Hz calculated natural mode). (a) Combined impedance, Zt, seen by a volume-velocity source at location x. (b) Negative upstream admittance, H, at location x.
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Variation of the magnitude and phase of the acoustic frequency-response functions with axial position at the higher-frequency instability (593 Hz calculated natural mode). (a) Combined impedance, Zt, seen by a volume-velocity source at location x. (b) Negative upstream admittance, H, at location x.

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