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 . Phase-shifted close-loop air forcing of the flame can reduce the pressure oscillations amplitude by . 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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January 2007
Technical Papers
Combustion Instabilities and Control of a Multiswirl Atmospheric Combustor
Tongxun Yi,
Tongxun Yi
Department of Aerospace Engineering and Engineering Mechanics,
University of Cincinnati
, Cincinnati, OH 45220-0070
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Ephraim J. Gutmark
Ephraim J. Gutmark
Department of Aerospace Engineering and Engineering Mechanics,
University of Cincinnati
, Cincinnati, OH 45220-0070
Search for other works by this author on:
Tongxun Yi
Department of Aerospace Engineering and Engineering Mechanics,
University of Cincinnati
, Cincinnati, OH 45220-0070
Ephraim J. Gutmark
Department of Aerospace Engineering and Engineering Mechanics,
University of Cincinnati
, Cincinnati, OH 45220-0070J. Eng. Gas Turbines Power. Jan 2007, 129(1): 31-37 (7 pages)
Published Online: January 22, 2006
Article history
Received:
January 21, 2004
Revised:
January 22, 2006
Citation
Yi, T., and Gutmark, E. J. (January 22, 2006). "Combustion Instabilities and Control of a Multiswirl Atmospheric Combustor." ASME. J. Eng. Gas Turbines Power. January 2007; 129(1): 31–37. https://doi.org/10.1115/1.2181595
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