Turbulent jet stability increased by ribs inside the nozzle – Stereo PIV measurement one diameter past the nozzle

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dc.contributor.authorDuda, Daniel
dc.contributor.authorAbrhám, Vladimír
dc.contributor.authorUruba, Václav
dc.contributor.authorYanovych, Vitalii
dc.date.accessioned2022-04-04T10:00:11Z
dc.date.available2022-04-04T10:00:11Z
dc.date.issued2021
dc.description.abstract-translatedWe observe that decreasing the inner nozzle surface by adding longitudinal ribs increases the jet stability in terms of the amount of turbulent kinetic energy in the near shear layer. We try to explain our observation as a stabilization effect of secondary flow vortices emerging in the corners of the ribs. These stream-wise vortices damage the development of larger-scale structures in the near shear layer. This explanation is supported by autocorrelation function of the stream-wise velocity component, which displays slightly smaller integral length-scale in the case with ribs than in the case of smooth nozzle. The experiment is performed at Reynolds number 2.2 × 105 (based on the nozzle diameter 50 mm); the Stereo-PIV (Particle Image Velocimetry) measurement takes place at the plane perpendicular to the jet axis one diameter past the nozzle exit. Optical 3D scanner controls the real nozzle geometry. This article presents preliminary measurement at single position and single velocity only; further exploration of this problem is needed.en
dc.format7 s.cs
dc.format.mimetypeapplication/pdf
dc.identifier.citationDUDA, D. ABRHÁM, V. URUBA, V. YANOVYCH, V. Turbulent jet stability increased by ribs inside the nozzle – Stereo PIV measurement one diameter past the nozzle. In 20th Conference on Power System Engineering. Pilsen: EDP Sciences, 2021. s. 1-7. ISBN: neuvedeno , ISSN: 2261-236Xcs
dc.identifier.document-number748890700006
dc.identifier.doi10.1051/matecconf/202134500006
dc.identifier.isbnneuvedeno
dc.identifier.issn2261-236X
dc.identifier.obd43933848
dc.identifier.urihttp://hdl.handle.net/11025/47310
dc.language.isoenen
dc.project.IDEF16_026/0008389/LoStr: Výzkumná spolupráce pro dosažení vyšší účinnosti a spolehlivosti lopatkových strojůcs
dc.publisherEDP Sciencesen
dc.relation.ispartofseries20th Conference on Power System Engineeringen
dc.rights© authorsen
dc.rights.accessopenAccessen
dc.subject.translatedturbulent jeten
dc.subject.translatednozzleen
dc.subject.translatedPIVen
dc.titleTurbulent jet stability increased by ribs inside the nozzle – Stereo PIV measurement one diameter past the nozzleen
dc.typekonferenční příspěvekcs
dc.typeConferenceObjecten
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen

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