1 Jet pump development for emergency draining of Kopswerk II By (original) (raw)

2015

Abstract

The lowest point of the underground hydroelectric power station Kopswerk II of the Vorarl-berger Illwerke, Austria, lies 60m below the tailwater level. For emergency draining even in the case of complete power failure a water jet pump fed by the headwater was designed. The challenge of this jet pump development lies in the high feeding pressure of 83 bar. Jet pumps with such high driving pressure tend to suffer from severe cavitation. Focus during the devel-opment process was therefore on the prevention of cavitation. On one hand the jet pump was designed following experimental experience from several sources. On the other hand numerical flow simulation was performed. The wall contour of the mixing chamber was changed iteratively in order to avoid low pressure zones. Efficiency of the pump could be optimized by adjusting the nozzle position of the ejector. The global pump data obtained by numerical flow computation agreed well with the experimental data published in literature.

Thomas Staubli hasn't uploaded this paper.

Let Thomas know you want this paper to be uploaded.

Ask for this paper to be uploaded.