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Characteristics of Synchronous and Asynchronous modes of fluctuations in Francis turbine draft tube during load variation
Department of Mechanical and Industrial Engineering, Indian Institute of Technology.
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.ORCID iD: 0000-0001-7599-0895
Department of Mechanical and Industrial Engineering, Indian Institute of Technology.
2017 (English)In: International Journal of Fluid Machinery and Systems, ISSN 1882-9554, E-ISSN 1882-9554, Vol. 10, no 2, 164-175 p.Article in journal (Refereed) Published
Abstract [en]

Francis turbines are often operated over a wide load range due to high flexibility in electricity demand and penetration of other renewable energies. This has raised significant concerns about the existing designing criteria. Hydraulic turbines are not designed to withstand large dynamic pressure loadings on the stationary and rotating parts during such conditions. Previous investigations on transient operating conditions of turbine were mainly focused on the pressure fluctuations due to the rotor-stator interaction. This study characterizes the synchronous and asynchronous pressure and velocity fluctuations due to rotor-stator interaction and rotating vortex rope during load variation, i.e. best efficiency point to part load and vice versa. The measurements were performed on the Francis-99 test case. The repeatability of the measurements was estimated by providing similar movement to guide vanes twenty times for both load rejection and load acceptance operations. Synchronized two dimensional particle image velocimetry and pressure measurements were performed to investigate the dominant frequencies of fluctuations, vortex rope formation, and modes (rotating and plunging) of the rotating vortex rope. The time of appearance and disappearance of rotating and plunging modes of vortex rope was investigated simultaneously in the pressure and velocity data. The asynchronous mode was observed to dominate over the synchronous mode in both velocity and pressure measurements.

Place, publisher, year, edition, pages
Japan Science and Technology Information Aggregator, Electronic , 2017. Vol. 10, no 2, 164-175 p.
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-63560DOI: 10.5293/IJFMS.2017.10.2.164Scopus ID: 2-s2.0-85020440500OAI: oai:DiVA.org:ltu-63560DiVA: diva2:1098950
Note

Validerad;2017;Nivå 1;2017-05-31 (rokbeg)

Available from: 2017-05-29 Created: 2017-05-29 Last updated: 2017-11-24Bibliographically approved

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Publisher's full textScopushttps://www.jstage.jst.go.jp/article/ijfms/10/2/10_164/_article

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Cervantes, Michel J.

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