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Intrinsic thermoacoustic modes and their interplay with acoustic modes in a Rijke burner
Eindhoven Univ Technol, Mech Engn Dept, POB 513, NL-5600 MB Eindhoven, Netherlands.;Bekaert Combust Technol BV, Assen, Netherlands..
Eindhoven Univ Technol, Mech Engn Dept, POB 513, NL-5600 MB Eindhoven, Netherlands..
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. Eindhoven Univ Technol, Mech Engn Dept, POB 513, NL-5600 MB Eindhoven, Netherlands.ORCID iD: 0000-0002-3609-3005
Tech Univ Munich, Mech Engn Dept, Garching, Germany..
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2018 (English)In: International Journal of Spray and Combustion Dynamics, ISSN 1756-8277, Vol. 10, no 4, p. 315-325Article in journal (Refereed) Published
Abstract [en]

The interplays between acoustic and intrinsic modes in a model of a Rijke burner are revealed and their influence on the prediction of thermoacoustic instabilities is demonstrated. To this end, the system is examined for a range of time delays, temperature ratios and reflection coefficients as adjustable parameters. A linear acoustic network model is used and all modes with frequency below the cut-on frequency for non-planar acoustic waves are considered. The results show that when reflection coefficients are reduced, the presence of a pure ITA mode limits the reduction in the growth rate that usually results from a reduction of the reflection coefficients. In certain conditions, the growth rates can even increase by decreasing reflections. As the time delay of the flame and thus the ITA frequency decreases, the acoustic modes couple to and subsequently decouple from the pure ITA modes. These effects cause the maximum growth rate to alternate between the modes. This investigation draws a broad picture of acoustic and intrinsic modes, which is crucial to accurate prediction and interpretation of thermoacoustic instabilities.

Place, publisher, year, edition, pages
Sage Publications, 2018. Vol. 10, no 4, p. 315-325
Keywords [en]
Intrinsic thermoacoustic instability, Rijke burner, network model, acoustic mode, ITA mode
National Category
Other Engineering and Technologies
Identifiers
URN: urn:nbn:se:kth:diva-240742DOI: 10.1177/1756827718782884ISI: 000453453000005Scopus ID: 2-s2.0-85058561681OAI: oai:DiVA.org:kth-240742DiVA, id: diva2:1276343
Funder
EU, FP7, Seventh Framework Programme, FP7-PEOPLE-ITN-2012.FP7-PEOPLE-ITN-2012.
Note

QC 20190108

Available from: 2019-01-08 Created: 2019-01-08 Last updated: 2019-01-08Bibliographically approved

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Lopez Arteaga, Ines

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  • apa
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