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Experimental investigations of transient pressure variations in a high head model Francis turbine during start-up and shutdown
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-7599-0895
Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee.
Department of Energy and Process Engineering, Water Power Laboratory, Norwegian University of Science and Technology, Trondheim.
2014 (English)In: Journal of Hydrodynamics, ISSN 1001-6058, E-ISSN 1000-4874, Vol. 26, no 2, p. 277-290Article in journal (Refereed) Published
Abstract [en]

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 (HM = 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.

Place, publisher, year, edition, pages
2014. Vol. 26, no 2, p. 277-290
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-9216DOI: 10.1016/S1001-6058(14)60031-7ISI: 000335366400013Scopus ID: 2-s2.0-84899826229Local ID: 7c742037-63c4-4e5f-8339-178e97d10ce8OAI: oai:DiVA.org:ltu-9216DiVA, id: diva2:982154
Note
Validerad; 2014; Bibliografisk uppgift: Journal of Hydrodynamics, Ser. B enligt Science Direct; 20140508 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Trivedi, ChiragCervantes, Michel

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