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Title: Experimental investigation of a high head Francis turbine during spin-no-load operation
Authors: Trivedi C.
Cervantes M.J.
Dahlhaug O.G.
Gandhi, Bhupendra K.
Published in: Journal of Fluids Engineering, Transactions of the ASME
Abstract: 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. Copyright © 2015 by ASME.
Citation: Journal of Fluids Engineering, Transactions of the ASME (2015), 137(6): -
Issue Date: 2015
Publisher: American Society of Mechanical Engineers (ASME)
ISSN: 982202
Author Scopus IDs: 55627166200
Author Affiliations: Trivedi, C., Norwegian University of Science and Technology, Trondheim, 7491, Norway
Cervantes, M.J., Norwegian University of Science and Technology, Trondheim, 7491, Norway, Luleå University of Technology, Luleå, 971 87, Sweden
Dahlhaug, O.G., Norwegian University of Science and Technology, Trondheim, 7491, Norway
Gandhi, B.K., Indian Institute of Technology, Roorkee, 247 667, India
Appears in Collections:Journal Publications [ME]

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