Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
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 University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, I.R. Iran.
Number of Authors: 3
2016 (English)In: IOP Conference Series: Earth and Environment, ISSN 1755-1307, E-ISSN 1755-1315, Vol. 49, no 2, 022008Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
2016. Vol. 49, no 2, 022008
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-62643DOI: 10.1088/1755-1315/49/2/022008ScopusID: 2-s2.0-85012070423OAI: oai:DiVA.org:ltu-62643DiVA: diva2:1084073
Conference
28th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2016, Grenoble, France; 4 - 8 July 2016
Note

Konferensartikel i tidskrift; 2017-03-23 (rokbeg)

Available from: 2017-03-23 Created: 2017-03-23 Last updated: 2017-03-23Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Cervantes, Michel
By organisation
Fluid and Experimental Mechanics
In the same journal
IOP Conference Series: Earth and Environment
Fluid Mechanics and Acoustics

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf