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Numerical Study of Reduced Francis-99 Turbine Model During Part Load Operation
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-0173-5853
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-7599-0895
University of Tehran, Iran.
2019 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

Numerical investigation was performed on a reduced model of a high head Francis turbine model at part load (PL) operating condition. Studies performed in the past on nearly complete Francis-99 turbine model (inclusive of spiral casing, stay vanes, guide vanes, runner and draft tube) reportedly consisted of large number of mesh elements, which increase the computational time and power significantly. In the present paper, numerical study was performed on a standalone model of the Francis-99 elbow draft tube so as to imitate the flow behaviour inside the draft tube during PL condition. The inlet profiles of the axial, radial and tangential velocity were considered from the study performed on a semi- Francis-99 model (1 stay vane, 2 guide vanes, 1 runner passage and draft tube) considered from NVKS Francis-99 second workshop. Additionally, turbulent kinetic energy (k) and turbulent eddy dissipation (ε) variables were also considered for better flow prediction inside the draft tube. Two approaches were implemented in the present study. In the first approach, the entire planar profile between the runner and draft tube interface was considered and in the second approach, flow variables along a radial profile at the runner exit was considered together with an axisymmetric flow assumption. The numerical results obtained from the present study were validated against the experimental results and were found to be in good agreement, both qualitatively and quantitatively, thus, ensuring the fidelity of the numerical methodology. The present study could be considered useful for mitigation of rotating vortex rope (RVR) studies.

Place, publisher, year, edition, pages
2019.
Keywords [en]
Computational fluid dynamics, Francis turbine, Part load, Reduced modelling, Rotating vortex rope
National Category
Fluid Mechanics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-81128OAI: oai:DiVA.org:ltu-81128DiVA, id: diva2:1476256
Conference
15th Asian International Conference on Fluid Machinery (AICFM15), Busan, South Korea, September 25-27, 2019
Available from: 2020-10-14 Created: 2020-10-14 Last updated: 2025-10-22Bibliographically approved

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Joy, JeslineCervantes, Michel

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CiteExportLink to record
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