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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/12527
Title: Transient pressure measurements on a high head model Francis turbine during emergency shutdown, total load rejection, and runaway
Authors: Trivedi C.
Cervantes M.J.
Gandhi, Bhupendra K.
Dahlhaug O.G.
Published in: Journal of Fluids Engineering, Transactions of the ASME
Abstract: The penetration of intermittent wind and solar power to the grid network above manageable limits disrupts electrical power grids. Consequently, hydraulic turbines synchronized to the grid experience total load rejection and are forced to shut down immediately. The turbine runner accelerates to runaway speeds in a few seconds, inducing high-amplitude, unsteady pressure loading on the blades. This sometimes results in a failure of the turbine components. Moreover, the unsteady pressure loading significantly affects the operating life of the turbine runner. Transient measurements were carried out on a scale model of a Francis turbine prototype (specific speed1/40.27) during an emergency shutdown with a transition into total load rejection. A detailed analysis of variables such as the head, discharge, pressure at different locations including the runner blades, shaft torque, and the guide vane angular movements are performed. The maximum amplitudes of the unsteady pressure fluctuations in the turbine were observed under a runaway condition. The amplitudes were 2.1 and 2.6 times that of the pressure loading at the best efficiency point in the vaneless space and runner, respectively. Such high-amplitude, unsteady pressure pulsations can affect the operating life of the turbine. Copyright © 2014 by ASME.
Citation: Journal of Fluids Engineering, Transactions of the ASME (2014), 136(12): -
URI: https://doi.org/10.1115/1.4027794
http://repository.iitr.ac.in/handle/123456789/12527
Issue Date: 2014
Publisher: American Society of Mechanical Engineers (ASME)
Keywords: Emergency shutdown
Francis turbine
Load rejection
Pressure
Runaway
ISSN: 982202
Author Scopus IDs: 55627166200
55328928400
7006087147
23008431600
Author Affiliations: Trivedi, C., Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India, Lulea University of Technology, SE-971 87 Lulea, Sweden
Cervantes, M.J., Lulea University of Technology, SE-971 87 Lulea, Sweden, Norwegian University of Science and Technology, 7491 Trondheim, Norway
Gandhi, B.K., Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Dahlhaug, O.G., Norwegian University of Science and Technology, 7491 Trondheim, Norway
Corresponding Author: Cervantes, M.J.; Lulea University of TechnologySweden
Appears in Collections:Journal Publications [ME]

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