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Experimental Investigation of a High Head Francis Turbine During Spin-No-Load Operation
Norwegian University of Science and Technology (NTNU), Trondheim.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-7599-0895
Department of Energy and Process Engineering, Water Power Laboratory, Norwegian University of Science and Technology, Trondheim, Norwegian University of Science and Technology (NTNU), Trondheim.
Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Indian Institute of Technology, Roorkee.
2015 (English)In: Journal of Fluids Engineering, ISSN 0098-2202, E-ISSN 1528-901X, Vol. 137, no 6, article id 61106Article in journal (Refereed) Published
Abstract [en]

Water passes freely through a hydraulic turbine in the absence of power requirements or during maintenance of the transmission lines, spillways, or dam. Moreover, the turbine operates under no-load conditions prior to generator synchronization during startup and after the generator disconnection from the grid load for shutdown. High-velocity swirling flow during spin-no-load (SNL) induces unsteady pressure pulsations in the turbine, and these pulsations cause fatigue in the blades. To investigate the amplitude of unsteady pressure loading, transient pressure measurements were carried out in a model Francis turbine during SNL. A total of six pressure sensors were mounted inside the turbine, i.e., one in the vaneless space, three on the blade surfaces, and two in the draft tube, and three discharge conditions were investigated over the operating range of the turbine. Analysis of the unsteady pressure data showed that the runner blades experience high-amplitude pressure loading during SNL. The amplitudes at all sensor locations were high compared with those under the normal operating condition of the turbine, i.e., the best efficiency point (BEP), and increased as the discharge through the turbine increased.

Place, publisher, year, edition, pages
2015. Vol. 137, no 6, article id 61106
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-3792DOI: 10.1115/1.4029729ISI: 000353966000006Scopus ID: 2-s2.0-84924944238Local ID: 1a0a5d02-3c06-4e71-b574-4fbeb5e55cd1OAI: oai:DiVA.org:ltu-3792DiVA, id: diva2:976653
Note
Validerad; 2015; Nivå 2; 20150314 (cervante)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2022-02-10Bibliographically approved

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