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Expanding operation ranges using active flow control in Francis turbines
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
2014 (engelsk)Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgaveAlternativ tittel
Lastområdesutvidgning med aktiv flödeskontroll i Francisturbiner (svensk)
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.

sted, utgiver, år, opplag, sider
2014. , s. 46
Serie
EL ; 1405
Emneord [en]
Hydropower, flow control, rheingans, vortex rope, air injection, water injection, draft tube, pressure surge
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-90392OAI: oai:DiVA.org:umu-90392DiVA, id: diva2:727953
Eksternt samarbeid
Jämtkraft
Utdanningsprogram
Högskoleingenjörsprogrammet i Elkraftteknik - nätbaserat
Presentation
2014-06-05, A305, Håken Gullessons väg 20, Teknikhuset, Umeå universitet 901 87, Umeå, 14:38 (svensk)
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Examiner
Tilgjengelig fra: 2014-06-23 Laget: 2014-06-23 Sist oppdatert: 2014-06-25bibliografisk kontrollert

Open Access i DiVA

Lastområdesutvidgning med aktiv flödeskontroll i Francisturbiner(3384 kB)1160 nedlastinger
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