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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, Skolan för teknikvetenskap (SCI), Farkost och flyg. 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 (Engelska)Ingår i: International Journal of Spray and Combustion Dynamics, ISSN 1756-8277, Vol. 10, nr 4, s. 315-325Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
Sage Publications, 2018. Vol. 10, nr 4, s. 315-325
Nyckelord [en]
Intrinsic thermoacoustic instability, Rijke burner, network model, acoustic mode, ITA mode
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Annan teknik
Identifikatorer
URN: urn:nbn:se:kth:diva-240742DOI: 10.1177/1756827718782884ISI: 000453453000005Scopus ID: 2-s2.0-85058561681OAI: oai:DiVA.org:kth-240742DiVA, id: diva2:1276343
Forskningsfinansiär
EU, FP7, Sjunde ramprogrammet, FP7-PEOPLE-ITN-2012.FP7-PEOPLE-ITN-2012.
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QC 20190108

Tillgänglig från: 2019-01-08 Skapad: 2019-01-08 Senast uppdaterad: 2019-01-08Bibliografiskt granskad

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Lopez Arteaga, Ines

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