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The Tale of an Intake Vortex and Its Mitigation Countermeasure: A Case Study from Akkats Hydropower Station
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Hållbar utveckling, miljövetenskap och teknik, Resurser, energi och infrastruktur. Vattenfall AB Res & Dev, Alvkarleby Lab, SE-81426 Alvkarleby, Sweden.
Vattenfall AB Res & Dev, Alvkarleby Lab, SE-81426 Alvkarleby, Sweden.;Lulea Univ Technol, Div Fluid & Expt Mech, SE-97187 Lulea, Sweden..
Vattenfall AB Res & Dev, Alvkarleby Lab, SE-81426 Alvkarleby, Sweden..
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Hållbar utveckling, miljövetenskap och teknik, Resurser, energi och infrastruktur.
2018 (Engelska)Ingår i: Water, ISSN 2073-4441, E-ISSN 2073-4441, Vol. 10, nr 7, artikel-id 881Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
MDPI , 2018. Vol. 10, nr 7, artikel-id 881
Nyckelord [en]
Akkats, intake, lake tapping, swirling flow, vortex suppression, model tests
Nationell ämneskategori
Oceanografi, hydrologi och vattenresurser
Identifikatorer
URN: urn:nbn:se:kth:diva-235146DOI: 10.3390/w10070881ISI: 000442579700064Scopus ID: 2-s2.0-85049645374OAI: oai:DiVA.org:kth-235146DiVA, id: diva2:1249693
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QC 20180920

Tillgänglig från: 2018-09-20 Skapad: 2018-09-20 Senast uppdaterad: 2018-09-20Bibliografiskt granskad

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Yang, JamesTeng, Penghua

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