Characteristics of a reversible-pump turbine have been measured with five different leading edge profiles in turbine mode. These profiles varied the inlet blade angle and the radius of curvature. Further geometry parameters have been investigated through numerical simulations. The pump turbine tested has much steeper flow-speed characteristics than a comparable Francis turbine. The most obvious geometry difference is the inlet part of the runner blades, where the blade angle for the pump turbine is much smaller than for the Francis turbine. Two different blade angles have been tested on a physical model and computational fluid dynamics (CFD) simulations have been performed on four different angles. Both methods show that a smaller blade angle gives less steep characteristics in turbine mode, whereas the measured s-shape in turbine brake- and turbine pumping mode gets more exaggerated. Long-radius leading edges result in less steep characteristics. The unstable pump turbine characteristics are in the literature shown to be a result of vortex formation in the runner and guide vane channels. A leading edge with longer curvature radius moves the formation of vortices towards higher speed of rotation.
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December 2012
Research-Article
Dependency on Runner Geometry for Reversible-Pump Turbine Characteristics in Turbine Mode of Operation
Grunde Olimstad,
Torbjørn Nielsen,
Torbjørn Nielsen
e-mail: torbjorn.nielsen@ntnu.no
Department of Energy and Process Engineering,
Department of Energy and Process Engineering,
Norwegian University of Science and Technology
,Alfred Getz Vei 4
,Trondheim 7491
, Norway
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Bjarne Børresen
Bjarne Børresen
Search for other works by this author on:
Grunde Olimstad
e-mail: grunde.olimstad@ntnu.no
Torbjørn Nielsen
e-mail: torbjorn.nielsen@ntnu.no
Department of Energy and Process Engineering,
Department of Energy and Process Engineering,
Norwegian University of Science and Technology
,Alfred Getz Vei 4
,Trondheim 7491
, Norway
Bjarne Børresen
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF Fluids ENGINEERING. Manuscript received February 13, 2012; final manuscript received October 7, 2012; published online November 20, 2012. Assoc. Editor: Bart van Esch.
J. Fluids Eng. Dec 2012, 134(12): 121102 (9 pages)
Published Online: November 20, 2012
Article history
Received:
February 13, 2012
Revision Received:
October 7, 2012
Citation
Olimstad, G., Nielsen, T., and Børresen, B. (November 20, 2012). "Dependency on Runner Geometry for Reversible-Pump Turbine Characteristics in Turbine Mode of Operation." ASME. J. Fluids Eng. December 2012; 134(12): 121102. https://doi.org/10.1115/1.4007897
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