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Experimental Investigation of a 10 MW Prototype Kaplan Turbine during Start-Up Operation
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-5143-7729
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.ORCID iD: 0000-0001-6016-6342
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-7599-0895
2019 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 12, no 23, article id 4852Article in journal (Refereed) Published
Abstract [en]

An increase in the start/stop cycles of hydraulic turbines due to the penetration of intermittent renewable energy sources is important. Hydraulic instabilities that occur in hydraulic turbines during start/stops may cause structural issues in the turbine components. High-stress fluctuations on the runner blades are expected during start-ups due to the unsteady pressure loading on the runner blades. This paper presents experiments performed on a 10 MW prototype Kaplan turbine at the Porjus Hydropower Center during a start-up cycle. Synchronized unsteady pressure and strain measurements on a runner blade and axial, bending (in two directions) and torsion strain measurements on the shaft were performed. In addition, the general parameters of the turbine (e.g., rotational speed, guide vane opening and runner blade angle) were acquired. Low-frequency fluctuations (0–15 Hz) were observed in the pressure data on the runner blade after opening the guide vanes from the completely closed position. A higher strain value was observed on the strain gauges installed on the runner blade near the hub (200–500 μm/m ) compared to the ones near the shroud at the leading and trailing edge. The strain fluctuation level on the shaft decreased after loading the generator by further opening the guide vanes. Higher fluctuations were observed in the torsion strain compared to axial and bending strain. In addition, the torsion strain peak-to-peak value reached 12 times its corresponding value at 61% guide vane opening.

Place, publisher, year, edition, pages
MDPI, 2019. Vol. 12, no 23, article id 4852
Keywords [en]
prototype Kaplan turbine, start-up, pressure measurement, strain measurement, axial strain, bending strain, torsion strain
National Category
Fluid Mechanics and Acoustics Other Mechanical Engineering
Research subject
Fluid Mechanics; Computer Aided Design
Identifiers
URN: urn:nbn:se:ltu:diva-77053DOI: 10.3390/en12234582Scopus ID: 2-s2.0-85076238316OAI: oai:DiVA.org:ltu-77053DiVA, id: diva2:1374834
Note

Validerad;2020;Nivå 2;2020-01-03 (johcin)

Available from: 2019-12-03 Created: 2019-12-03 Last updated: 2020-04-20Bibliographically approved

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Soltani Dehkharqani, ArashEngström, FredrikAidanpää, Jan-OlovCervantes, Michel

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