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dc.contributor.authorAgnalt, Einar
dc.contributor.authorØstby, Petter Thorvald Krogh
dc.contributor.authorSolemslie, Bjørn Winther
dc.contributor.authorDahlhaug, Ole Gunnar
dc.identifier.citationShock and Vibration. 2018, 2018 .nb_NO
dc.description.abstractAn analysis of the pressure in a runner channel of a low-specific speed Francis model runner during resonance is presented, which includes experiments and the development of a pressure model to estimate both the convective and acoustic pressure field from the measurements. The pressure was measured with four pressure sensors mounted in the runner hub along one runner channel. The mechanical excitation of the runner corresponded to the forced excitation from rotor-stator interaction. The rotational speed was used to control the excitation frequency. The measurements found a clear resonance peak in the pressure field excited by the second harmonic of the guide vane passing frequency. From the developed pressure model, the eigenfrequency and damping were estimated. The convective pressure field seems to diminish almost linearly from the inlet to outlet of the runner, while the acoustic pressure field had the highest amplitudes in the middle of the runner channel. At resonance, the acoustic pressure clearly dominated over the convective pressure. As the turbine geometry is available to the public, it provides an opportunity for the researchers to verify their codes at resonance conditions.nb_NO
dc.publisherHindawi Publishing Corporationnb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleExperimental Study of a Low-Specific Speed Francis Model Runner during Resonancenb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.source.journalShock and Vibrationnb_NO
dc.relation.projectNorges forskningsråd: 257588nb_NO
dc.relation.projectNorges forskningsråd: 254987nb_NO
dc.description.localcode© 2018 Einar Agnalt et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.nb_NO
cristin.unitnameInstitutt for energi- og prosessteknikk
cristin.unitnameInstitutt for maskinteknikk og produksjon

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