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Synchronized PIV and pressure measurements on a model Francis turbine during start-up
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics. Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, India.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics. Water Power Laboratory, Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, Norway.ORCID iD: 0000-0001-7599-0895
Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, India.
2019 (English)In: Journal of Hydraulic Research, ISSN 0022-1686, E-ISSN 1814-2079Article in journal (Refereed) Epub ahead of print
Abstract [en]

This paper presents the experiments performed on a high head model Francis turbine during start-up. Synchronized time dependent pressure and velocity measurements were performed to investigate the instabilities in the turbine. A total of four steady state operating points, namely synchronous load, part load, best efficiency point, and high load are considered to perform the turbine start-up. The runner angular speed was observed to increase almost exponentially during the guide vane positions from completely closed to no load condition. The frequency of wave propagation due to the interaction between runner blades and guide vanes was observed to follow the trend of increase of runner angular speed. A vortex rope frequency was captured in the draft tube during synchronous load to part load of the start-up. Two different mechanisms, namely, the development of stagnation point and the available recirculation regions were observed to cause the formation of vortex rope in the draft tube.

Place, publisher, year, edition, pages
Taylor & Francis, 2019.
Keywords [en]
Francis turbine, particle image velocimetry, pressure fluctuations, recirculating flow, rotating vortex rope stagnation point, start-up
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-73588DOI: 10.1080/00221686.2018.1555551ISI: 000465727200001OAI: oai:DiVA.org:ltu-73588DiVA, id: diva2:1304081
Available from: 2019-04-11 Created: 2019-04-11 Last updated: 2019-05-14

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Goyal, RahulCervantes, Michel

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