Premixed flames of swirl-stabilized combustors (displaced half-cone) are susceptible to thermo-acoustic instabilities, which should be avoided under all operating conditions in order to guarantee a long service life for both stationary and aircraft gas turbines. The source of this unstable flame behavior can be found in a transition of the premix flame structure between two stationary conditions that can be easily excited by fuel fluctuations, coherent structures within the flow, and other mechanisms. Pilot flames can alleviate this issue either by improving the dynamic stability directly or by sustaining the main combustion process at operating points where instabilities are unlikely. In the present study, the impact of two different premixed pilot injections on the combustion stability is investigated. One of the pilot injector (pilot flame injector) was located upstream of the recirculation zone at the apex of the burner. The second one was a pilot ring placed at the burner outlet on the dump plane. A noticeable feature of the pilot injector was that an ignition device allowed for creating pilot premixed flames. The present investigation showed that these premixed pilot flames were able to suppress instabilities over a wider fuel/air ratio range than the conventional premixed pilot injection alone. Furthermore, it was possible to prevent instabilities and maintain the flame burning near the lean blowout when a percentage of the fuel was premixed with air and injected through the pilot ring. emissions were significantly reduced.
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e-mail: albrecht@pi.tu-berlin.de
e-mail: stefanie.bade@pi.tu-berlin.de
e-mail: arnaud.lacarelle@pi.tu-berlin.de
e-mail: oliver.paschereit@tu-berlin.de
e-mail: ephraim.gutmark@uc.edu
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April 2010
Research Papers
Instability Control by Premixed Pilot Flames
Peter Albrecht,
Peter Albrecht
Hermann-Foettinger Institute (ISTA),
e-mail: albrecht@pi.tu-berlin.de
Technical University of Berlin
, D-10623 Berlin, Germany
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Stefanie Bade,
Stefanie Bade
Hermann-Foettinger Institute (ISTA),
e-mail: stefanie.bade@pi.tu-berlin.de
Technical University of Berlin
, D-10623 Berlin, Germany
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Arnaud Lacarelle,
Arnaud Lacarelle
Hermann-Foettinger Institute (ISTA),
e-mail: arnaud.lacarelle@pi.tu-berlin.de
Technical University of Berlin
, D-10623 Berlin, Germany
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Christian Oliver Paschereit,
Christian Oliver Paschereit
Professor
Hermann-Foettinger Institute (ISTA),
e-mail: oliver.paschereit@tu-berlin.de
Technical University of Berlin
, D-10623 Berlin, Germany
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Ephraim Gutmark
Ephraim Gutmark
Distinguished Professor
Department of Aerospace Engineering and Engineering Mechanics,
e-mail: ephraim.gutmark@uc.edu
University of Cincinnati
, Cincinnati, OH 45221-0070
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Peter Albrecht
Hermann-Foettinger Institute (ISTA),
Technical University of Berlin
, D-10623 Berlin, Germany
e-mail: albrecht@pi.tu-berlin.de
Stefanie Bade
Hermann-Foettinger Institute (ISTA),
Technical University of Berlin
, D-10623 Berlin, Germany
e-mail: stefanie.bade@pi.tu-berlin.de
Arnaud Lacarelle
Hermann-Foettinger Institute (ISTA),
Technical University of Berlin
, D-10623 Berlin, Germany
e-mail: arnaud.lacarelle@pi.tu-berlin.de
Christian Oliver Paschereit
Professor
Hermann-Foettinger Institute (ISTA),
Technical University of Berlin
, D-10623 Berlin, Germany
e-mail: oliver.paschereit@tu-berlin.de
Ephraim Gutmark
Distinguished Professor
Department of Aerospace Engineering and Engineering Mechanics,
University of Cincinnati
, Cincinnati, OH 45221-0070e-mail: ephraim.gutmark@uc.edu
J. Eng. Gas Turbines Power. Apr 2010, 132(4): 041501 (8 pages)
Published Online: January 12, 2010
Article history
Received:
February 25, 2008
Revised:
August 25, 2008
Online:
January 12, 2010
Published:
January 12, 2010
Citation
Albrecht, P., Bade, S., Lacarelle, A., Paschereit, C. O., and Gutmark, E. (January 12, 2010). "Instability Control by Premixed Pilot Flames." ASME. J. Eng. Gas Turbines Power. April 2010; 132(4): 041501. https://doi.org/10.1115/1.3019293
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