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Study on the Accuracy of RANS Modelling of the Turbulent Flow Developed in a Kaplan Turbine Operated at BEP. Part 1 - Velocity Field
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics. University Politehnica of Bucharest, Romania.
University Politehnica of Bucharest, Romania.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-7599-0895
2019 (English)In: Journal of Applied Fluid Mechanics, ISSN 1735-3572, E-ISSN 1735-3645, Vol. 12, no 5, p. 1449-1461Article in journal (Refereed) Published
Abstract [en]

This paper investigates the accuracy of Reynolds-averaged Navier-Stokes (RANS) turbulence modelling applied to complex industrial applications. In the context of the increasing instability of the energy market, hydropower plants are frequently working at off-design parameters. Such operation conditions have a strong impact on the efficiency and life span of hydraulic turbines. Therefore, research is currently focused on improving the design and increasing the operating range of the turbines. Numerical simulations represent an accessible and cost efficient alternative to model testing. The presented test case is the Porjus U9 Kaplan turbine model operated at best efficiency point (BEP). Both steady and unsteady numerical simulations are carried out using different turbulence models: k-epsilon, RNG k-epsilon and k-omega Shear Stress Transport (SST). The curvature correction method applied to the SST turbulence model is also evaluated showing nearly no sensitivity to the different values of the production correction coefficient Cscale. The simulations are validated against measurements performed in the turbine runner and draft tube. The numerical results are in good agreement with the experimental time-dependent velocity profiles. The advantages and limitations of RANS modelling are discussed. The most accurate results were provided by the simulations using the k-epsilon and the SST-CC turbulence models but very small differences were obtained between the different tested models. The precision of the numerical simulations decreased towards the outlet of the computational domain. In a companion paper, the pressure profiles obtained numerically are investigated and compared to experimental data.

Place, publisher, year, edition, pages
Physics Society of Iran , 2019. Vol. 12, no 5, p. 1449-1461
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-73849DOI: 10.29252/jafm.12.05.29704ISI: 000482650000009OAI: oai:DiVA.org:ltu-73849DiVA, id: diva2:1313729
Note

Validerad;2019;Nivå 2;2019-09-03 (johcin)

Available from: 2019-05-06 Created: 2019-05-06 Last updated: 2019-09-13Bibliographically approved

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Iovanel, Raluca GabrielaCervantes, Michel

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