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TECHNICAL PAPERS: Gas Turbines: Combustion and Fuels

The Effect of Fuel/Air Mixing on Actuation Authority in an Active Combustion Instability Control System

[+] Author and Article Information
J. M. Cohen, J. H. Stufflebeam, W. Proscia

United Technologies Research Center, East Hartford, CT 06108

J. Eng. Gas Turbines Power 123(3), 537-542 (Oct 01, 2000) (6 pages) doi:10.1115/1.1373399 History: Received October 01, 1999; Revised October 01, 2000
Copyright © 2001 by ASME
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References

Figures

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Spectrum of uncontrolled combustion instability, showing high-amplitude pressure fluctuations at approximately 200 Hz.
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Schematic of premixing fuel nozzle
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Schematic of 4-MW single-nozzle combustor. Operating pressure=1.5 MPa. Inlet temperature=710 K.
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Schematic of threshold control algorithm, showing method of time-delayed on/off actuation
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Illustration of the intent of the actuation technique, utilizing the reduction of equivalence ratio fluctions by pulsed fuel injection
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Cross section schematic of premixing fuel nozzle with actuated fuel injection spoke for introduction of control fuel flow (configurations 1-3)
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Detailed view of three “spoke” injection configurations
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Cross section schematic of premixing fuel nozzle with actuation of a portion of the main fuel injection array (configuration 4)
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Steady-state fuel/air concentration profiles at premixer exit for three spoke injection concepts and configuration 4 (two-port main fuel injector). Concentration values have been normalized by the mean value for each case.
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Phase-averaged fuel/air concentration profiles and unmixedness at premixer exit for 2-Hz modulation of fuel injection using configuration 4
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Variation of spatially averaged fuel/air ratio at premixer exit over one period (5 msec) of 200 Hz fuel flow modulation. Bars indicate spatial variance about average value at each time.
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The effect of steady-state fuel/air mixing on actuator authority in combustion tests for four different actuated fuel injection configurations
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Comparison of uncontrolled and controlled combustor pressure spectra for control with main fuel array actuation (configuration 4)

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