Due to stringent emission restrictions, modern gas turbines mostly rely on lean premixed combustion. Since this combustion mode is susceptible to thermoacoustic instabilities, there is a need for modeling tools with predictive capabilities. Linear network models are able to predict the occurrence of thermoacoustic instabilities but yield no information on the oscillation amplitude. The prediction of the pulsation levels and hence an estimation whether a certain operating condition has to be avoided is only possible if information on the nonlinear flame response is available. Typically, the flame response shows saturation at high forcing amplitudes. A newly constructed atmospheric test rig, specifically designed for the realization of high excitation amplitudes over a broad frequency range, is used to generate extremely high acoustic forcing power with velocity fluctuations of up to 100% of the mean flow. The test rig consists of a generic combustor with a premixed swirl-stabilized natural gas flame, where the upstream part has a variable length to generate adaptive resonances of the acoustic field. The chemiluminescence response, with respect to velocity fluctuations at the burner, is measured for various excitation frequencies and amplitudes. From these measurements, an amplitude dependent flame transfer function is obtained. Phase-averaged pictures are used to identify changes in the flame shape related to saturation mechanisms. For different frequency regimes, different saturation mechanisms are identified.
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October 2011
Research Papers
An Experimental Investigation of the Nonlinear Response of an Atmospheric Swirl-Stabilized Premixed Flame
Sebastian Schimek,
Sebastian Schimek
Chair of Fluid Dynamics, Institute of Fluid Dynamics and Technical Acoustics,
e-mail: sebastian.schimek@pi.tu-berlin.de
Hermann-Föttinger-Institut
, Technische Universität Berlin, 10623 Berlin, Germany
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Jonas P. Moeck,
Jonas P. Moeck
Chair of Fluid Dynamics, Institute of Fluid Dynamics and Technical Acoustics,
Hermann-Föttinger-Institut
, Technische Universität Berlin, 10623 Berlin, Germany
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Christian Oliver Paschereit
Christian Oliver Paschereit
Chair of Fluid Dynamics, Institute of Fluid Dynamics and Technical Acoustics,
Hermann-Föttinger-Institut
, Technische Universität Berlin, 10623 Berlin, Germany
Search for other works by this author on:
Sebastian Schimek
Chair of Fluid Dynamics, Institute of Fluid Dynamics and Technical Acoustics,
Hermann-Föttinger-Institut
, Technische Universität Berlin, 10623 Berlin, Germanye-mail: sebastian.schimek@pi.tu-berlin.de
Jonas P. Moeck
Chair of Fluid Dynamics, Institute of Fluid Dynamics and Technical Acoustics,
Hermann-Föttinger-Institut
, Technische Universität Berlin, 10623 Berlin, Germany
Christian Oliver Paschereit
Chair of Fluid Dynamics, Institute of Fluid Dynamics and Technical Acoustics,
Hermann-Föttinger-Institut
, Technische Universität Berlin, 10623 Berlin, GermanyJ. Eng. Gas Turbines Power. Oct 2011, 133(10): 101502 (7 pages)
Published Online: April 25, 2011
Article history
Received:
May 18, 2010
Revised:
May 27, 2010
Online:
April 25, 2011
Published:
April 25, 2011
Citation
Schimek, S., Moeck, J. P., and Paschereit, C. O. (April 25, 2011). "An Experimental Investigation of the Nonlinear Response of an Atmospheric Swirl-Stabilized Premixed Flame." ASME. J. Eng. Gas Turbines Power. October 2011; 133(10): 101502. https://doi.org/10.1115/1.4002946
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