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Effects of runner change on the Winter-Kennedy flow measurement method: A numerical study
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-5833-6736
Institut de Recherche D’Hydro-Québec.
Department of Mechanical and Industrial Engineering, Indian Institute of Technology.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-7599-0895
2020 (English)In: Renewable energy, ISSN 0960-1481, E-ISSN 1879-0682, Vol. 153, p. 975-984Article in journal (Refereed) Published
Abstract [en]

The Winter-Kennedy (WK) method is a popular choice to estimate the relative flow rates, and thus the expected improvement in the efficiency of a low head turbine after its refurbishment. Runner refurbishment is a common way to improve the plant’s efficiency. However, a previous experiment on a model turbine reported deviations between the WK coefficients obtained from two different runners ‒ suggesting a deviation between the estimated and actual improvement in the efficiency. Without formal proof, the deviation was attributed to flow changes in the spiral casing. This paper presents a numerical investigation of the effects of a runner change on the WK method. For this purpose, unsteady Reynolds-averaged Navier-Stokes equations (URANS) simulations of a turbine model with two different runners were conducted. The runner’s impact on the average flow conditions upstream and its subsequent effect on the WK coefficients were studied. The study shows the dependence of the WK coefficients to the runner ‒ with a maximum deviation on the coefficient up to 0.7%. The larger deviations were observed in regions prone to strong secondary flow. Following a radial and circumferential sensitivity study, a suitable location to minimize the effects of runner change on the WK method is reported.

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 153, p. 975-984
Keywords [en]
Winter-Kennedy, Hydropower, Flow rate, Runner change, CFD
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-77855DOI: 10.1016/j.renene.2020.02.055OAI: oai:DiVA.org:ltu-77855DiVA, id: diva2:1396102
Note

Validerad;2020;Nivå 2;2020-04-22 (johcin)

Available from: 2020-02-25 Created: 2020-02-25 Last updated: 2020-04-23Bibliographically approved
In thesis
1. A numerical investigation of the Winter-Kennedy method with application to axial turbines
Open this publication in new window or tab >>A numerical investigation of the Winter-Kennedy method with application to axial turbines
2020 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2020
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-78632 (URN)978-91-7790-595-0 (ISBN)978-91-7790-596-7 (ISBN)
Public defence
2020-06-17, E632, Luleå, 13:00 (English)
Opponent
Supervisors
Available from: 2020-04-24 Created: 2020-04-23 Last updated: 2020-05-25Bibliographically approved

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Baidar, BinayaCervantes, Michel J.

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