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dc.contributor.authorGoyal, Rahul
dc.contributor.authorTrivedi, Chirag
dc.contributor.authorGandhi, BK
dc.contributor.authorCervantes, Michel
dc.date.accessioned2017-11-22T06:58:18Z
dc.date.available2017-11-22T06:58:18Z
dc.date.created2017-07-19T10:57:04Z
dc.date.issued2017
dc.identifier.issn2250-0545
dc.identifier.urihttp://hdl.handle.net/11250/2467427
dc.description.abstractHydraulic turbines are operated over an extended operating range to meet the real time electricity demand. Turbines operated at part load have flow parameters not matching the designed ones. This results in unstable flow conditions in the runner and draft tube developing low frequency and high amplitude pressure pulsations. The unsteady pressure pulsations affect the dynamic stability of the turbine and cause additional fatigue. The work presented in this paper discusses the flow field investigation of a high head model Francis turbine at part load: 50% of the rated load. Numerical simulation of the complete turbine has been performed. Unsteady pressure pulsations in the vaneless space, runner, and draft tube are investigated and validated with available experimental data. Detailed analysis of the rotor stator interaction and draft tube flow field are performed and discussed. The analysis shows the presence of a rotating vortex rope in the draft tube at the frequency of 0.3 times of the runner rotational frequency. The frequency of the vortex rope precession, which causes severe fluctuations and vibrations in the draft tube, is predicted within 3.9% of the experimental measured value. The vortex rope results pressure pulsations propagating in the system whose frequency is also perceive in the runner and upstream the runner.nb_NO
dc.language.isoengnb_NO
dc.publisherSpringer Verlagnb_NO
dc.titleNumerical Simulation and Validation of a High Head Model Francis Turbine at Part Load Operating Conditionnb_NO
dc.typeJournal articlenb_NO
dc.description.versionsubmittedVersionnb_NO
dc.source.volume6nb_NO
dc.source.journalJournal of The Institution of Engineers (India): Series Cnb_NO
dc.source.issue5nb_NO
dc.identifier.doi10.1007/s40032-017-0380-z
dc.identifier.cristin1482581
dc.description.localcodeThis is a submitted manuscript of an article published by Springer Verlag in Journal of The Institution of Engineers (India): Series C, 07 July 2017. Locked until 2018-07-08.nb_NO
cristin.unitcode194,64,25,0
cristin.unitnameInstitutt for energi- og prosessteknikk
cristin.ispublishedtrue
cristin.fulltextoriginal


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