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Flames in context of thermo-acoustic stability bounds
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Marcus Wallenberg Laboratoriet. Eindhoven University of Technology, Netherlands .ORCID-id: 0000-0002-3609-3005
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2015 (Engelska)Ingår i: Proceedings of the Combustion Institute, ISSN 1540-7489, Vol. 35, s. 1073-1078Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Bounds are derived for the acoustic losses such that a thermoacoustic system with a given flame can be guaranteed to be stable. The analysis is based on the flame's acoustic input-to-output properties represented by its scattering matrix. The developed analytical and numerical techniques allow estimating the maximum reflection coefficients (equivalently - acoustic losses) which are sufficient to ensure stable operation of a given burner. It is shown that the calculated numerical upper-bound is less conservative than the analytical one. The frequency dependence of the required acoustic losses provides (i) a thermo-acoustic signature of the flame and (ii) guidelines for the proper design of the up-and downstream acoustics from the flame. The method is illustrated on two burners/flames of premixed multiple Bunsen type. The frequency dependence of the upper bounds allows to identify those frequency ranges where the flame is more likely to cause instability of the complete system.

Ort, förlag, år, upplaga, sidor
2015. Vol. 35, s. 1073-1078
Nyckelord [en]
Thermo-acoustic instability, Scattering matrix, Upper bound for losses, Premixed Bunsen flames
Nationell ämneskategori
Energiteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-160762DOI: 10.1016/j.proci.2014.06.059ISI: 000348047500114OAI: oai:DiVA.org:kth-160762DiVA, id: diva2:791649
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QC 20150302

Tillgänglig från: 2015-03-02 Skapad: 2015-02-27 Senast uppdaterad: 2015-03-02Bibliografiskt granskad

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Arteaga, Ines Lopez

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