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Numerical Simulation of the Flow Through a Kaplan Draft Tube
ept. of Hydraulics, Hydraulic Machinery and Environment Engineering, University POLITEHNICA of Bucharest, Romania.
ept. of Hydraulics, Hydraulic Machinery and Environment Engineering, University POLITEHNICA of Bucharest, Romania.
ept. of Hydraulics, Hydraulic Machinery and Environment Engineering, University POLITEHNICA of Bucharest, Romania.
ept. of Hydraulics, Hydraulic Machinery and Environment Engineering, University POLITEHNICA of Bucharest, Romania.
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2016 (English)In: University “Politehnica” of Bucharest Scientific Bulletin, Series D: Mechanical Engineering, ISSN 1454-2358, Vol. 78, no 4, p. 215-224Article in journal (Refereed) Published
Abstract [en]

This paper presents a comparison between steady turbulent flow simulation results in the U9 Kaplan turbine draft tube and experimental velocity and pressure measurements. Two turbulence models were tested, k-epsilon and Shear StressTransport (SST). The results show that the k-epsilon model performs better than the SST model.The objective is to find a correlation between the pressure measured below the runner in the draft tube cone, and the optimal guide vane angle for a given bladeangle. Such correlation may allow the continuous online optimization of the cam characteristic. For this purpose, the influence of the tangential velocity on the pressure in the draft tube was specifically investigated.

Place, publisher, year, edition, pages
Universitatea Politehnica Bucuresti , 2016. Vol. 78, no 4, p. 215-224
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-73846Scopus ID: 2-s2.0-85050246307OAI: oai:DiVA.org:ltu-73846DiVA, id: diva2:1313725
Available from: 2019-05-06 Created: 2019-05-06 Last updated: 2019-06-05Bibliographically approved

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