Investigation of the Global Mode in Swirling Combustor Flows: Experimental Observations and Local and Global Stability Analysis

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dc.contributor.authorTerhaar, Steffen
dc.contributor.authorParedes, P.
dc.contributor.authorOberleithner, Kilian
dc.contributor.authorTheofilis, V.
dc.contributor.authorPaschereit, Christian Oliver
dc.date.accessioned2018-04-19T07:24:46Z
dc.date.available2018-04-19T07:24:46Z
dc.date.issued2015
dc.description.abstractSelf-excited helical flow oscillations are frequently observed in gas turbine combustors. In the present work a new approach is presented tackling this phenomenon with stability concepts. Three reacting swirling flows are investigated. All of them undergo vortex breakdown, but only two of them show self-excited global flow oscillations at well-defined frequencies. The oscillations feature a precession of the vortex core and synchronized Kelvin-Helmholtz instabilities in the shear layers. Based on the mean flow fields, local and global linear hydrodynamic stability analyses are carried out. The dampening effect of the Reynolds stresses is accounted for by an eddy viscosity estimated from the experimental results. Both the local and the global analysis successfully identify linear global modes as being responsible for the large-scale flow oscillations and successfully predict their frequency. However, only the global analysis accurately predicts a globally stable flow field for the case without the oscillation, while the local analysis overpredicts the global growth rate. The predicted spatial distribution of the amplitude functions agree very well to the experimentally identified global mode. This successful application of global and local stability concepts to a complex and practically relevant flow configuration paves the way for the application of theoretically-founded passive and active control strategies.en
dc.identifier.issn2210-9838
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/7620
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-6810
dc.language.isoen
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject.ddc530 Physik
dc.subject.otherturbulent swirling flowen
dc.subject.otherglobal modeen
dc.subject.otherlocal and global stability analysisen
dc.subject.othereddy viscosityen
dc.titleInvestigation of the Global Mode in Swirling Combustor Flows: Experimental Observations and Local and Global Stability Analysisen
dc.typeArticle
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.doi10.1016/j.piutam.2015.03.079
dcterms.bibliographicCitation.journaltitleProcedia IUTAMen
dcterms.bibliographicCitation.originalpublishernameElsevier BV
dcterms.bibliographicCitation.originalpublisherplaceRed Hook, NY
dcterms.bibliographicCitation.pageend562
dcterms.bibliographicCitation.pagestart553
dcterms.bibliographicCitation.volume14
tub.accessrights.dnbfree
tub.affiliationFak. 5 Verkehrs- und Maschinensysteme::Inst. Strömungsmechanik und Technische Akustik (ISTA)::FG Experimentelle Strömungsmechanikde
tub.affiliation.facultyFak. 5 Verkehrs- und Maschinensystemede
tub.affiliation.groupFG Experimentelle Strömungsmechanikde
tub.affiliation.instituteInst. Strömungsmechanik und Technische Akustik (ISTA)de
tub.publisher.universityorinstitutionTechnische Universität Berlinde

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