B. G. Mulu, M. J. Cervantes, Christophe Devals, T. C. Vu et François Guibault
Article de revue (2015)
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Abstract
This paper presents a detailed comparison of steady and unsteady turbulent flow simulation results in the U9 Kaplan turbine draft tube with experimental velocity and pressure measurements. The computational flow domain includes the guide vanes, the runner and the draft tube. A number of turbulence models were studied, including the standard k - epsilon, RNG k - epsilon, SST and SST-SAS models. Prediction of the flow behavior in the conical section of the draft tube directly below the runner cone is very sensitive to the prediction of the separation point on the runner cone. The results demonstrate a significant increase in precision of the flow modeling in the runner cone region by using unsteady flow simulations compare to stage simulation. The prediction of the flow in the runner cone region, however, remains delicate, and no turbulence model could accurately predict the complex phenomena observed experimentally.
Mots clés
kaplan turbine; hydropower; boundary condition; cfd; experimental validation; turbulence models; draft tube; numerical-simulation; les
| Sujet(s): | 2200 Mécanique des fluides > 2203 Modélisation et simulation |
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| Département: | Département de génie informatique et génie logiciel |
| Organismes subventionnaires: | Swedish Waterpower Centre (SVC) |
| URL de PolyPublie: | https://publications.polymtl.ca/5040/ |
| Titre de la revue: | Engineering Applications of Computational Fluid Mechanics (vol. 9, no 1) |
| Maison d'édition: | Taylor & Francis |
| DOI: | 10.1080/19942060.2015.1004816 |
| URL officielle: | https://doi.org/10.1080/19942060.2015.1004816 |
| Date du dépôt: | 20 déc. 2022 10:14 |
| Dernière modification: | 08 avr. 2024 17:00 |
| Citer en APA 7: | Mulu, B. G., Cervantes, M. J., Devals, C., Vu, T. C., & Guibault, F. (2015). Simulation-based investigation of unsteady flow in near-hub region of a Kaplan turbine with experimental comparison. Engineering Applications of Computational Fluid Mechanics, 9(1), 139-156. https://doi.org/10.1080/19942060.2015.1004816 |
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