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Comparison of numerical and experimental results of the flow in the U9 Kaplan turbine model
Chalmers University of Technology.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Chalmers University of Technology.
2010 (English)In: 25th IAHR Symposium on Hydraulic Machinery and Systems: 20-24 September 2010 'Politehnica' University of Timişoara, Timişoara, Romania, London: IOP Publishing Ltd , 2010, 12024- p.Conference paper (Refereed)
Abstract [en]

The present work compares simulations made using the OpenFOAM CFD code with experimental measurements of the flow in the U9 Kaplan turbine model. Comparisons of the velocity profiles in the spiral casing and in the draft tube are presented. The U9 Kaplan turbine prototype located in Porjus and its model, located in Älvkarleby, Sweden, have curved inlet pipes that lead the flow to the spiral casing. Nowadays, this curved pipe and its effect on the flow in the turbine is not taken into account when numerical simulations are performed at design stage. To study the impact of the inlet pipe curvature on the flow in the turbine, and to get a better overview of the flow of the whole system, measurements were made on the 1:3.1 model of the U9 turbine. Previously published measurements were taken at the inlet of the spiral casing and just before the guide vanes, using the laser Doppler anemometry (LDA) technique. In the draft tube, a number of velocity profiles were measured using the LDA techniques. The present work extends the experimental investigation with a horizontal section at the inlet of the draft tube. The experimental results are used to specify the inlet boundary condition for the numerical simulations in the draft tube, and to validate the computational results in both the spiral casing and the draft tube. The numerical simulations were realized using the standard k-e model and a block-structured hexahedral wall function mesh.

Place, publisher, year, edition, pages
London: IOP Publishing Ltd , 2010. 12024- p.
Series
, I O P Conference Series: Earth and Environment, ISSN 1755-1307 ; 1
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-39925DOI: 10.1088/1755-1315/12/1/012024Local ID: edb351e0-cd64-11df-a707-000ea68e967bOAI: oai:DiVA.org:ltu-39925DiVA: diva2:1013444
Conference
IAHR Symposium on Hydraulic Machinery and Systems : 20/09/2010 - 24/09/2010
Note
Validerad; 2010; 20101001 (cervante)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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