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TECHNICAL PAPERS: Gas Turbines: Combustion and Fuels

Instability of a Premix Burner With Nonmonotonic Pressure Drop Characteristic

[+] Author and Article Information
W. Polifke, A. Fischer, T. Sattelmayer

Lehrstuhl für Thermodynamik, Technische Universität München, 85747 Garching, Germany

J. Eng. Gas Turbines Power 125(1), 20-27 (Dec 27, 2002) (8 pages) doi:10.1115/1.1519267 History: Received December 01, 2000; Revised March 01, 2001; Online December 27, 2002
Copyright © 2003 by ASME
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References

Figures

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Sketch of the test rig (not to scale): I—choked inlet to plenum, P—plenum, C—combustion chamber, X—exit. Flow is from left to right. All dimensions are in mm. The nominal cross-sectional area of the burner is evaluated in the throat of the burner at c.
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Pressure drop characteristic, i.e., difference pP−pC of the mean pressures in plenum and combustor versus air excess ratio λ for power output P=61 kW (–), 75 kW ([[dashed_line]]), 95 kW (+), and 106 kW (⋄). Strong combustion oscillations were observed with P=95 kW for λ<1.26 and with P=106 kW for λ<1.24.
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Flame shape near lean blow out (top) and near stoichiometric (bottom)
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Pressure drop coefficient ζ versus air excess ratio λ for power output P=61 kW (–), 75 kW ([[dashed_line]]), 95 kW (+), and 106 kW (⋄). Strong combustion oscillations were observed with P=95 kW for λ<1.26 and with P=106 kW for λ<1.24.
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Exemplary sketch of a premix combustion system. P—plenum chamber, B—inside burner, cross section with nominal area AB,l—(virtual) length of the burner, f–h—position of flame, C—combustion chamber, X—choked exit. Flow is from left to right.
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Sketch of a pressure loss characteristic with negative slope. If the mass flux increases beyond point X, the mode of flame stabilization changes, pressure drop decreases and the system may become unstable.
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Frequency f (top) and cycle increment ς (bottom) of first acoustic mode as a function of the nondimensionalized gradient χ of the press drop characteristic

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