Stability Analysis of Time-averaged Jet Flows: Fundamentals and Application

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dc.contributor.authorOberleithner, Kilian
dc.contributor.authorPaschereit, Christian Oliver
dc.contributor.authorSoria, Julio
dc.date.accessioned2018-04-19T07:24:40Z
dc.date.available2018-04-19T07:24:40Z
dc.date.issued2015
dc.description.abstractWe report on experimental and theoretical investigations of shear flow instabilities in jet flows. Linear stability analysis is applied to the time-averaged flow taken from experiments, contrasting the ‘classic’ stability approach that is based on a stationary base flow. To some extend, mean flow stability eigenmodes may deal as a model for instability waves at their nonlinearly saturated state, which is typically encountered in experiments. The capability of mean flow stability models is first demonstrated on laminar oscillating jets where the primary interaction takes place between the mean flow and the instability wave. We then focus on turbulent swirling jets where additional interactions occur between the fine-scale turbulence and the instability waves. Swirling flows are widely used in combustion applications where the associated high turbulence levels and internal recirculation zones (vortex breakdown bubble) are exploited for flame stabilization. We demonstrate the application of mean flow stability analysis on the flow field of a industry- relevant swirl-stabilized flame. We show that the flame response to acoutstic perturbations is closely linked to the flow receptivity predicted from linear stability analysis, which suggests that the adopted theoretical framework is very useful for thermoacoustic modeling.en
dc.identifier.issn2210-9838
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/7619
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-6809
dc.language.isoen
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject.ddc530 Physik
dc.subject.otherlinear stability analysisen
dc.subject.otherjet flowsen
dc.subject.otherconvective/global instabilityen
dc.subject.othercoherent structuresen
dc.subject.otherthermoacoustic instabilityen
dc.titleStability Analysis of Time-averaged Jet Flows: Fundamentals and Applicationen
dc.typeArticle
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.doi10.1016/j.piutam.2015.03.034
dcterms.bibliographicCitation.journaltitleProcedia IUTAMen
dcterms.bibliographicCitation.originalpublishernameElsevier BV
dcterms.bibliographicCitation.originalpublisherplaceRed Hook, NY
dcterms.bibliographicCitation.pageend146
dcterms.bibliographicCitation.pagestart141
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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