Properties of a sweeping jet emitted from a fluidic oscillator

dc.contributor.authorOstermann, Florian
dc.contributor.authorWoszidlo, Rene
dc.contributor.authorNayeri, Christian Navid
dc.contributor.authorPaschereit, Christian Oliver
dc.date.accessioned2019-02-07T10:04:02Z
dc.date.available2019-02-07T10:04:02Z
dc.date.issued2018
dc.descriptionDieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.de
dc.descriptionThis publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.en
dc.description.abstractThis experimental study investigates the flow field and properties of a sweeping jet emitted from a fluidic oscillator into a quiescent environment. The aspect ratio of the outlet throat is 1. Stereoscopic particle image velocimetry is employed to measure the velocity field plane-by-plane. Simultaneously acquired pressure measurements provide a reference for phase correlating the individual planes yielding three-dimensional, time-resolved velocity information. Lagrangian and Eulerian visualization techniques illustrate the phase-averaged flow field. Circular head vortices, similar to the starting vortex of a steady jet, are formed repetitively when the jet is at its maximum deflection. The quantitative jet properties are determined from instantaneous velocity data using a cylindrical coordinate system that takes into account the changing deflection angle of the jet. The jet properties vary throughout the oscillation cycle. The maximum jet velocity decays much faster than that of a comparable steady jet indicating a higher momentum transfer to the environment. The entrainment rate of the spatially oscillating jet is larger than for a steady jet by a factor of 4. Most of the mass flow is entrained from the direction normal to the oscillation plane, which is accompanied by a significant increase in jet depth compared to a steady jet. The high entrainment rate results from the enlarged contact area between jet and ambient fluid due to the spatial oscillation. The jet’s total force exceeds that of an idealized steady jet by up to 30 %. The results are independent of the investigated oscillation frequencies in the range from 5 to 20 Hz.en
dc.identifier.eissn1469-7645
dc.identifier.issn0022-1120
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/9073
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-8174
dc.language.isoenen
dc.relation.ispartof10.14279/depositonce-7144
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.ddc532 Mechanik der Fluide, Mechanik der Flüssigkeitende
dc.subject.othersweeping jeten
dc.subject.otherfluid oscillatoren
dc.subject.otherfundamental flow fielden
dc.subject.otherfluidischer Oszillatorde
dc.subject.otherfundamentales Strömungsfeldde
dc.titleProperties of a sweeping jet emitted from a fluidic oscillatoren
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.doi10.1017/jfm.2018.739en
dcterms.bibliographicCitation.journaltitleJournal of fluid mechanicsen
dcterms.bibliographicCitation.originalpublishernameCambridge University Pressen
dcterms.bibliographicCitation.originalpublisherplaceCambridgeen
dcterms.bibliographicCitation.pageend238en
dcterms.bibliographicCitation.pagestart216en
dcterms.bibliographicCitation.volume857en
tub.accessrights.dnbdomain*
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 Berlinen

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