Can-annular combustors consist of a set of independent cans, connected on the upstream side to the combustor plenum and on the downstream side to the turbine inlet, where a transition duct links the round geometry of each can with the annular segment of the turbine inlet. Each transition duct is open on the sides toward the adjacent transition ducts, so that neighboring cans are acoustically connected through a so-called cross-talk open area. This theoretical, numerical, and experimental work discusses the effect that this communication has on the thermoacoustic frequencies of the combustor. We show how this communication gives rise to axial and azimuthal modes, and that these correspond to particularly synchronized states of axial thermoacoustic oscillations in each individual can. We show that these combustors typically show clusters of thermoacoustic modes with very close frequencies and that a slight loss of rotational symmetry, e.g., a different acoustic response of certain cans, can lead to mode localization. We corroborate the predictions of azimuthal modes, clusters of eigenmodes, and mode localization with experimental evidence.
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January 2019
Research-Article
Thermoacoustics of Can-Annular Combustors
G. Ghirardo,
G. Ghirardo
Ansaldo Energia Switzerland,
Römerstrasse 36,
Baden 5401, Switzerland
e-mail: giulio.ghirardo@ansaldoenergia.com
Römerstrasse 36,
Baden 5401, Switzerland
e-mail: giulio.ghirardo@ansaldoenergia.com
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C. Di Giovine,
C. Di Giovine
Ansaldo Energia Switzerland,
Römerstrasse 36,
Baden 5401, Switzerland
Römerstrasse 36,
Baden 5401, Switzerland
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J. P. Moeck,
J. P. Moeck
Institut für Strömungsmechanik und
Technische Akustik,
Technische Universität Berlin,
Berlin 10623, Germany;
Technische Akustik,
Technische Universität Berlin,
Berlin 10623, Germany;
Department of Energy and
Process Engineering,
Norwegian University of Science and
Technology,
Trondheim 7491, Norway
Process Engineering,
Norwegian University of Science and
Technology,
Trondheim 7491, Norway
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M. R. Bothien
M. R. Bothien
Ansaldo Energia Switzerland,
Römerstrasse 36,
Baden 5401, Switzerland
Römerstrasse 36,
Baden 5401, Switzerland
Search for other works by this author on:
G. Ghirardo
Ansaldo Energia Switzerland,
Römerstrasse 36,
Baden 5401, Switzerland
e-mail: giulio.ghirardo@ansaldoenergia.com
Römerstrasse 36,
Baden 5401, Switzerland
e-mail: giulio.ghirardo@ansaldoenergia.com
C. Di Giovine
Ansaldo Energia Switzerland,
Römerstrasse 36,
Baden 5401, Switzerland
Römerstrasse 36,
Baden 5401, Switzerland
J. P. Moeck
Institut für Strömungsmechanik und
Technische Akustik,
Technische Universität Berlin,
Berlin 10623, Germany;
Technische Akustik,
Technische Universität Berlin,
Berlin 10623, Germany;
Department of Energy and
Process Engineering,
Norwegian University of Science and
Technology,
Trondheim 7491, Norway
Process Engineering,
Norwegian University of Science and
Technology,
Trondheim 7491, Norway
M. R. Bothien
Ansaldo Energia Switzerland,
Römerstrasse 36,
Baden 5401, Switzerland
Römerstrasse 36,
Baden 5401, Switzerland
1Corresponding author.
Manuscript received June 22, 2018; final manuscript received June 28, 2018; published online September 14, 2018. Editor: Jerzy T. Sawicki.
J. Eng. Gas Turbines Power. Jan 2019, 141(1): 011007 (10 pages)
Published Online: September 14, 2018
Article history
Received:
June 22, 2018
Revised:
June 28, 2018
Citation
Ghirardo, G., Di Giovine, C., Moeck, J. P., and Bothien, M. R. (September 14, 2018). "Thermoacoustics of Can-Annular Combustors." ASME. J. Eng. Gas Turbines Power. January 2019; 141(1): 011007. https://doi.org/10.1115/1.4040743
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