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dc.contributor.authorØstby, Petter Thorvald Krogh
dc.contributor.authorAgnalt, Einar
dc.contributor.authorHaugen, Bjørn
dc.contributor.authorBilldal, Jan Tore
dc.contributor.authorDahlhaug, Ole Gunnar
dc.identifier.citationJournal of Physics: Conference Series. 2019, 1296 (012006)nb_NO
dc.description.abstractThe ability to predict a francis runners dynamic response to the exciting forces is paramount to avoid unwanted disintegration of the turbines components. In this article, each of the principal factors contributing to the dynamic response of the runner; eigenfrequency, mode shape, damping and pressure force, is individually examined and compared to the measured values from the Francis-99 runner. Even though the runner is made with a bolted connection between the blades and crown/band, and thus severely increasing the complexity, quite accurate predictions are possible using methods previously validated for massive and symmetric runners. All calculations are conducted on the best efficiency point and with eigenmodes corresponding to Nodal Diameter 4 as excited by the second harmonic of the guide vane passing frequency. The calculated natural frequency for the first two ND4 eigenmodes are within ±5% of the measured values. Further are the calculated eigenmodes, forcing pressure field and hydrodynamic damping all within measurement tolerances with some minor exceptions.nb_NO
dc.publisherInstitute of Physics, IOP Sciencenb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleFluid structure interaction of Francis-99 turbine and experimental validationnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.source.journalJournal of Physics: Conference Seriesnb_NO
dc.description.localcodeContent from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.nb_NO
cristin.unitnameInstitutt for maskinteknikk og produksjon
cristin.unitnameInstitutt for energi- og prosessteknikk

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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal