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Experimental study on flow asymmetry after the draft tube bend of a Kaplan turbine
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
School of Mechanical Engineering, University of Tehran, Mechanical Engineering Department, University of Tehran.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-7599-0895
2016 (English)In: Advances and Applications in Fluid Mechanics, ISSN 0973-4686, Vol. 19, no 2, p. 441-472Article in journal (Refereed) Published
Abstract [en]

Flow condition in a Kaplan turbine draft tube is investigated using laser Doppler anemometry (LDA) and particle image velocimetry(PIV). The investigated draft tube is composed of a cone followed by an elbow and a straight diffuser. The three velocity components were measured after the elbow at two different locations across the straight diffuser to quantify the flow asymmetry as well as the secondary flows formed in this region. The velocity profiles at the draft tube inlet are measured using a 2D LDA system allowing estimation of the draft tube inlet swirl. The results are presented at three operating points of the turbine. The flow condition after the draft tube bend was shown to be highly dependent on the vortex structures within the straight draft tube; namely Dean vortices and the swirl leaving the runner. At operating points with high flow rates and low swirl, Dean vortices dominate the upstream swirl; a symmetric but inhomogeneous flow resembling flow after a pipe bend forms within the straight diffuser. At part load operating points with high swirl and low flow rate, the flow after the bend is dominated by the upstream swirl resulting in asymmetric flow after the draft tube bend. The flow asymmetry is shown to be a 2nd order function of the swirl-to-Dean ratio.

Place, publisher, year, edition, pages
2016. Vol. 19, no 2, p. 441-472
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-2569DOI: 10.17654/FM019020441Scopus ID: 2-s2.0-84962361497Local ID: 030d4f61-5f1e-4b85-8c97-ec689d62cc5fOAI: oai:DiVA.org:ltu-2569DiVA, id: diva2:975422
Note
Validerad; 2016; Nivå 1; 20160331 (kavami)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Amiri, KavehMulu, BerhanuCervantes, Michel

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