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TECHNICAL PAPERS: Gas Turbines: Combustion and Fuels

Combustion Instabilities and Control of a Multiswirl Atmospheric Combustor

[+] Author and Article Information
Tongxun Yi, Ephraim J. Gutmark

Department of Aerospace Engineering and Engineering Mechanics, University of Cincinnati, Cincinnati, OH 45220-0070

J. Eng. Gas Turbines Power 129(1), 31-37 (Jan 22, 2006) (7 pages) doi:10.1115/1.2181595 History: Received January 21, 2004; Revised January 22, 2006

Thermoacoustic instability and lean blowout (LBO) are investigated experimentally in an atmospheric swirl-stabilized combustor fueled with gaseous propane. Factors affecting combustion instability are identified. Sinusoidal or steady air forcing of either the swirling air shear layer or the fuel line, with less than 1.0% of combustion air, can reduce pressure oscillations amplitude by more than 20dB. Phase-shifted close-loop air forcing of the flame can reduce the pressure oscillations amplitude by 13dB. For a constant air flow rate and air inlet temperature, initially smooth turbulent combustion exhibits relatively intense heat release oscillations with decreasing equivalence ratio, followed by a quiet state before blowout. High outer swirl intensity and a rich burning flame stabilization region can effectively extend the LBO limit.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Sketch of the atmospheric combustion rig

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Figure 2

Setup of the imaging system

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Figure 3

Phase-locked ICCD images (fresh air/propane are introduced from the bottom of each picture)

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Figure 4

Average pixel intensity and pressure

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Figure 5

Schematics of swirling shear layer forcing and “blocked” TARS detail (all main air enters through outer radial swirler)

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Figure 6

Pressure attenuation using steady and 100Hz air forcing of swirling shear layer

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Figure 7

Conceptual scheme for air forcing of fuel line

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Figure 8

Pressure attenuation by steady and sinusoidal air forcing of fuel line

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Figure 9

Schematic of air forcing of flame

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Figure 10

Pressure dynamics with phase-shift air forcing

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Figure 11

OH* frequency spectrum at Re=41,000

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