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Numerical Investigation of the Flow Structure in a Kaplan Draft Tube at Part Load
Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, I.R. Iran.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik.ORCID-id: 0000-0001-7599-0895
Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, I.R. Iran.
Rekke forfattare: 32016 (engelsk)Inngår i: IOP Conference Series: Earth and Environment, ISSN 1755-1307, E-ISSN 1755-1315, Vol. 49, nr 2, artikkel-id 022008Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This research presents numerical simulation of the unsteady flow field inside the draft tube of a Kaplan turbine at part load condition. Due to curvature of streamlines, the ordinary two-equations turbulence models fail to predict the flow features. Therefore, a modification of the Shear Stress Transport (SST-SAS) model is utilized to approximate the turbulent stresses. A guide vane, complete runner and draft tube are considered to insure the real boundary conditions at the draft tube inlet. The outlet boundary is assumed to discharge into the atmosphere. The obtained pressure fluctuations inside the draft tube are in good agreement with available experimental data. In order to further investigate the RVR formation and its movement, the λ2 criterion, relating the position of the vortex core and strength to the second largest Eigen value of the velocity gradient tensor, is employed. The method used for vortex identification shows the flow structure and vortex motion inside the draft tube accurately.

sted, utgiver, år, opplag, sider
2016. Vol. 49, nr 2, artikkel-id 022008
HSV kategori
Forskningsprogram
Strömningslära
Identifikatorer
URN: urn:nbn:se:ltu:diva-62643DOI: 10.1088/1755-1315/49/2/022008ISI: 000400156200008Scopus ID: 2-s2.0-85012070423OAI: oai:DiVA.org:ltu-62643DiVA, id: diva2:1084073
Konferanse
28th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2016, Grenoble, France; 4 - 8 July 2016
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Konferensartikel i tidskrift; 2017-03-23 (rokbeg)

Tilgjengelig fra: 2017-03-23 Laget: 2017-03-23 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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