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The tale of an intake vortex and its mitigation countermeasure: A case study from akkats hydropower station
Vattenfall AB Research and Development, Älvkarleby Laboratory.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics. Vattenfall AB Research and Development, Älvkarleby Laboratory.
Vattenfall AB Research and Development, Älvkarleby Laboratory.
Division of Resources, Energy and Infrastructure, Royal Institute of Technology.
2018 (English)In: Water, ISSN 2073-4441, E-ISSN 2073-4441, Vol. 10, no 7, article id 881Article in journal (Refereed) Published
Abstract [en]

The upgrade of Akkats power station in Sweden included a new, separate waterway for the addition of a 75 MW generating unit. The vertical intake of its headrace was formed by means of lake tapping. A physical model was used to help understand the blasting process involving fragmented rock, water, air, and gas. Upon commissioning of the unit, swirling flows occurred unexpectedly at the intake, which gave rise to negative consequences including limitations in power output. Echo-sounding showed that the blasted piercing resulted in an irregular intake. A hydraulic model, as part of the design process, was built to examine potential countermeasures for vortex suppression. The final solution was a segmented barrier between the intake and the dam. It effectively suppressed the intake flow circulations; only minor intermittent vortices were left. The fabricated steel segments were anchored into the bedrock, stretching to 1.0 m below the lowest legal reservoir level. The local intake headloss was also reduced. The implemented solution was tested under full turbine loading and the result was satisfactory. Even during winter seasons with ice cover above the wall, the power station ran normally. The case study is expected to provide guidance for solving similar problems with vortex formation.

Place, publisher, year, edition, pages
MDPI AG , 2018. Vol. 10, no 7, article id 881
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-70324DOI: 10.3390/w10070881Scopus ID: 2-s2.0-85049645374OAI: oai:DiVA.org:ltu-70324DiVA, id: diva2:1237892
Note

Validerad;2018;Nivå 2;2018-08-10 (andbra)

Available from: 2018-08-10 Created: 2018-08-10 Last updated: 2018-08-10Bibliographically approved

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