Combustion dynamics are a challenging problem in the design and operation of premixed gas turbine combustors. In premixed combustors, pressure oscillations created by the flame dynamic response can lead to damage. These dynamics are typically controlled by designing the combustor to achieve a stable operation for planned conditions, but dynamics may still occur with minor changes in ambient operating conditions or fuel composition. In these situations, pilot flames or adjustment to fuel flow splits can be used to stabilize the combustor, but often with a compromise in emission performance. As an alternative to purely passive design changes, prior studies have demonstrated that adjustment to the fuel system impedance can be used to stabilize combustion. Prior studies have considered just the response of an individual fuel injector and combustor. However, in practical combustion systems, multiple fuel injectors are used. In this situation, individual injector impedance can be modified to produce a different dynamic response from individual flames. The resulting impedance mismatch prevents all injectors from strongly coupling to the same acoustic mode. In principle, this mismatch should reduce the amplitude of dynamics and may expand the operating margin for stable combustion conditions. In this paper, a laboratory combustor with two premixed fuel injectors is used to study the effect of impedance mismatch on combustion stability. The two fuel injectors are equipped with variable geometry resonators that allow a survey of dynamic stability while changing the impedance of the individual fuel systems. Results demonstrate that a wide variation in dynamic response can be achieved by combining different impedance fuel injectors. A base line 7% rms pressure oscillation was reduced to less than 3% by mismatching the fuel impedance.
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January 2008
Research Papers
Effect of Fuel System Impedance Mismatch on Combustion Dynamics
Geo A. Richards,
e-mail: gricha@netl.doe.gov
Geo A. Richards
National Energy Technology Laboratory
, U.S. Department of Energy, PO Box 880, Morgantown, WV 26505
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Edward H. Robey
e-mail: eroby@netl.doe.gov
Edward H. Robey
National Energy Technology Laboratory
, Parsons, PO Box 880, Morgantown, WV 26505
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Geo A. Richards
National Energy Technology Laboratory
, U.S. Department of Energy, PO Box 880, Morgantown, WV 26505e-mail: gricha@netl.doe.gov
Edward H. Robey
National Energy Technology Laboratory
, Parsons, PO Box 880, Morgantown, WV 26505e-mail: eroby@netl.doe.gov
J. Eng. Gas Turbines Power. Jan 2008, 130(1): 011510 (7 pages)
Published Online: January 16, 2008
Article history
Received:
June 30, 2006
Revised:
July 21, 2006
Published:
January 16, 2008
Citation
Richards, G. A., and Robey, E. H. (January 16, 2008). "Effect of Fuel System Impedance Mismatch on Combustion Dynamics." ASME. J. Eng. Gas Turbines Power. January 2008; 130(1): 011510. https://doi.org/10.1115/1.2771249
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