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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/11528
Title: Experimental investigations of transient pressure variations in a high head model Francis turbine during start-up and shutdown
Authors: Trivedi C.
Cervantes M.J.
Gandhi, Bhupendra K.
Ole Dahlhaug G.
Published in: Journal of Hydrodynamics
Abstract: Penetration of the power generated using wind and solar energy to electrical grid network causing several incidents of the grid tripping, power outage, and frequency drooping. This has increased restart (star-stop) cycles of the hydroelectric turbines significantly since grid connected hydroelectric turbines are widely used to manage critical conditions of the grid. Each cycle induces significant stresses due to unsteady pressure loading on the runner blades. The presented work investigates the pressure loading to a high head (Hp = 377 m, Dp = 1.78 m) Francis turbine during start-stop. The measurements were carried out on a scaled model turbine (H M = 12.5 m, DM = 0.349 m). Total four operating points were considered. At each operating point, three schemes of guide vanes opening and three schemes of guide vanes closing were investigated. The results show that total head variation is up to 9% during start-stop of the turbine. On the runner blade, the maximum pressure amplitudes are about 14 kPa and 16 kPa from the instantaneous mean value of 121 kPa during rapid start-up and shutdown, respectively, which are about 1.5 times larger than that of the slow start-up and shutdown. Moreover, the maximum pressure fluctuations are given at the blade trailing edge. © 2014 Publishing House for Journal of Hydrodynamics.
Citation: Journal of Hydrodynamics (2014), 26(2): 277-290
URI: https://doi.org/10.1016/S1001-6058(14)60031-7
http://repository.iitr.ac.in/handle/123456789/11528
Issue Date: 2014
Publisher: China Ocean Press
Keywords: Francis turbine
pressure fluctuations
shutdown
start-up
transient
ISSN: 10016058
Author Scopus IDs: 55627166200
55328928400
7006087147
23008431600
Author Affiliations: Trivedi, C., Division of Fluid and Experimental Mechanics, Department of Engineering Sciences and Mathematics, LuleÃ¥ University of Technology, Sweden, Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, India
Cervantes, M.J., Division of Fluid and Experimental Mechanics, Department of Engineering Sciences and Mathematics, Luleå University of Technology, Sweden
Gandhi, B.K., Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, India
Ole Dahlhaug, G., Water Power Laboratory, Department of Energy and Process Engineering, Norwegian University of Science and Technology, Norway
Funding Details: Chirag Trivedi and Prof. Michel Cervantes are grateful to the Swedish Waterpower Centre (SVC) for the financial support. SVC has been established by the Swedish Energy Agency, Elforsk and SvenskaKraftnät together with LuleÃ¥ University of Technology, the Royal Institute of Technology, Chalmers University of Technology and Uppsala University (www.svc.nu).
Corresponding Author: Cervantes, M.J.; Division of Fluid and Experimental Mechanics, Department of Engineering Sciences and Mathematics, LuleÃ¥ University of TechnologySweden; email: Michel.Cervantes@ltu.se
Appears in Collections:Journal Publications [ME]

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