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Title: Experimental investigation on a high head Francis turbine model during shutdown operation
Authors: Goyal R.
Gandhi, Bhupendra K.
Cervantes M.J.
Published in: Proceedings of IOP Conference Series: Earth and Environmental Science
Abstract: Increased penetration of intermittent energy resources disturbs the power grid network. The frequency band of the power grid is normally controlled by automatic opening and closing of the guide vanes of hydraulic turbines. This has increased the number of shutdown cycles as compared to the defined ones for the normal operation of turbines. Turbine shutdown induced a significantly higher level of pressure fluctuations and unsteadiness in the flow field, decreasing its expected life. This paper presents experiments performed on a high head model Francis turbine during shutdown. The pressure and 2D Particle Image Velocimetry (PIV) measurements were performed to investigate the pressure fluctuations and flow instabilities in the turbine. The pressure sensors were mounted in the draft tube cone and vaneless space to measure the instantaneous pressure fluctuations. In the present study, the initial high load operating condition was considered to perform the turbine shutdown. The data were logged at the sampling frequency of 40 Hz and 5 kHz for PIV and pressure measurements, respectively. Time-resolved velocity and pressure data are presented in this paper to show the pressure fluctuations and causes of generation of unsteady flow in the draft tube. © 2019 Published under licence by IOP Publishing Ltd.
Citation: Proceedings of IOP Conference Series: Earth and Environmental Science, (2019)
Issue Date: 2019
Publisher: Institute of Physics Publishing
Keywords: Electric power system control
Electric power transmission networks
Energy resources
Francis turbines
Hydraulic machinery
Pressure measurement
Velocity measurement
Experimental investigations
Flow instabilities
Instantaneous pressures
Operating condition
Particle image velocimetries
Power grid networks
Pressure fluctuation
Sampling frequencies
Hydraulic motors
ISSN: 17551307
Author Scopus IDs: 57191617201
Author Affiliations: Goyal, R., Grenoble-INP/CNRS/UJF-Grenoble 1, LEGI, Grenoble, F-38041, France
Gandhi, B.K., Mechanical and Industrial Engineering Department, Indian Institute of Technology, Roorkee, 247337, India
Cervantes, M.J., Department of Engineering Science and Mathematics, Luleå University of Technology, Luleå, 97187, Sweden
Funding Details: The measurements have been carried out in collaboration between IIT Roorkee, LTU Sweden, and NTNU Norway. The authors’ gratitude goes to the staff of water power laboratory, NTNU, Norway. Special thanks to Prof. Ole Gunner Dahlhaug and Carl Bergan for providing the good measurement facilities. The authors are grateful to the Swedish Water Power Center (SVC) for the financial support. The authors would like to thank the Norwegian Hydropower Centre (NVKS) for the financial support.
Appears in Collections:Conference Publications [ME]

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