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TECHNICAL PAPERS: Gas Turbines: Combustion and Fuels

Advanced Closed-Loop Control on an Atmospheric Gaseous Lean-Premixed Combustor

[+] Author and Article Information
A. J. Riley, A. P. Dowling

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

S. Park, A. M. Annaswamy

Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139

S. Evesque

Lehrstuhl fuer Thermodynamik, Technische Universitaet Muenchen, Boltzmannstrasse 15, 85748 Garching, Germany

J. Eng. Gas Turbines Power 126(4), 708-716 (Nov 24, 2004) (9 pages) doi:10.1115/1.1788685 History: Received October 01, 2002; Revised March 01, 2003; Online November 24, 2004
Copyright © 2004 by ASME
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References

Figures

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Schematic of the rig downstream of the choke plate, showing the plenum/combustion chambers and the swirler unit (all dimensions in mm, diagram not to scale)
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Detailed schematic showing a cross section of the swirler unit and the orientation of the fuel injection bars
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Sound pressure level (SPL) spectrum of the self-excited combustion oscillations; ma=0.04 kg/s, ϕ=0.7
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Detailed schematic of the fuel system, together with the DDV and the plenum chamber
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Variation in the fuel jet velocity rms with valve frequency for maximum amplitude harmonic oscillations around 50% open position; mf=1.62 g/s (ϕ=0.6 for an air mass flow of ma=0.04 kg/s)
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The effect on the combustor pressure and the OH emission of forcing the fuel flow at 200 Hz; the valve driven harmonically at maximum amplitude, about 50% open position; ma=0.04 kg/s, ϕ=0.60, Lp=0.41 m,fDDV=200 Hz
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Time series showing the low-frequency fluctuations present in the combustor when the STR controller is activated; ma=0.04 kg/s, ϕ=0.65, τtot=9.6 ms,Lp=1.73 m, zero initial conditions for control parameters
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Time series showing the improvement on the pressure fluctuations in the combustor gained by filtering the STR controller input; ma=0.04 kg/s, ϕ=0.65, τtot=9.6 ms,Lp=1.73 m, controller input filter is 120–500 Hz
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Time series showing the improvement in the settling time of the STR controller when appropriate initial conditions are chosen; ma=0.04 kg/s, ϕ=0.65, τtot=9.6 ms,Lp=1.73 m, initial conditions of k1=−10,k2=10
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SPL spectra showing the reduction in noise when the STR and the delay controllers are turned on; ma=0.04 kg/s, ϕ=0.65, τtot=9.6 ms,Lp=1.73 m; controller input filter is 120–500 Hz
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SPL spectra showing the reduction in noise when the STR is turned on in the shorter plenum case; ma=0.04 kg/s, ϕ=0.70, τtot=9.6 ms,Lp=1.46 m, controller input filter is 120–500 Hz
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SPL spectra showing the reduction in noise when the STR is turned on in the longer plenum case; ma=0.04 kg/s, ϕ=0.65, τtot=9.6 ms,Lp=1.97 m, controller input filter is 120–500 Hz
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Change of the controller parameter, k1 in a longer plenum case with different adaptation gain γ1;ma=0.04 kg/s, ϕ=0.65, τtot=9.6 ms,Lp=1.97 m
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Time series showing the effect of the STR controller with changes in the mass flow rate of air, while the equivalence ratio is kept constant; ϕ=0.7, Lp=1.73 m, controller input filter is 120–500 Hz
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Time series showing the effect of the STR controller with incorrect initial condition in the control parameter; ma=0.04 kg/s, ϕ=0.65, τtot=9.6 ms,Lp=1.73 m, controller input filter is 120–500 Hz

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