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Expanding operation ranges using active flow control in Francis turbines
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2014 (English)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesisAlternative title
Lastområdesutvidgning med aktiv flödeskontroll i Francisturbiner (Swedish)
Abstract [en]

This report contains an investigation of fluid injection techniques used in the purpose of reducing deleterious flow effects occurring in the draft tube of Francis turbines when operating outside nominal load. There is a focus on implement ability at Jämtkrafts hydroelectric power plants and two power plants were investigated, located in series with each other named Lövhöjden and Ålviken. The only profitable scenario found with some degree of certainty was an increase in the operating range upwards to allow overload operation.

Findings show that both air and water can be introduced in various locations to improve hydraulic efficiency around the turbine parts as well as reduce pressure pulsations in harmful operating regions. Investments in such systems have proven useful and profitable at several facilities with poorly adapted operating conditions. But due to losses in efficiency when operating injection systems, it turns out unprofitable in situations where it does not improve the operating range in a way that is resulting in increased annual or peak production.

Place, publisher, year, edition, pages
2014. , 46 p.
, EL, 1405
Keyword [en]
Hydropower, flow control, rheingans, vortex rope, air injection, water injection, draft tube, pressure surge
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Fluid Mechanics and Acoustics Energy Systems
URN: urn:nbn:se:umu:diva-90392OAI: diva2:727953
External cooperation
Educational program
Högskoleingenjörsprogrammet i Elkraftteknik - nätbaserat
2014-06-05, A305, Håken Gullessons väg 20, Teknikhuset, Umeå universitet 901 87, Umeå, 14:38 (Swedish)
Available from: 2014-06-23 Created: 2014-06-23 Last updated: 2014-06-25Bibliographically approved

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Lastområdesutvidgning med aktiv flödeskontroll i Francisturbiner(3384 kB)586 downloads
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Type fulltextMimetype application/pdf

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Department of Applied Physics and Electronics
Electrical Engineering, Electronic Engineering, Information EngineeringFluid Mechanics and AcousticsEnergy Systems

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