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Numerical Investigation of Turbulent Flow through Rectangular and Biconvex Shaped Trash Racks
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Luleå tekniska universitet.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
2017 (English)In: Engineering, ISSN 1947-3931, E-ISSN 1947-394X, Vol. 9, no 5, 412-426 p., 76642Article in journal (Refereed) Published
Abstract [en]

Turbulent flow through a trash rack of bars of rectangular and biconvex shapes is considered. A trash rack is composed of an array of bars fitted into a hydro-electric power station to prevent debris and fish to enter the waterway towards the turbine. The work is directed towards modeling a large number of bars for which the flow turn out to have a periodic structure. It is here shown that this case can be simplified with the flow past a single bar together with periodic boundary conditions. Using this approach the head loss is derived for different angles of attack α and blockages P for two shapes of the rack, a rectangular bar and an aerodynamically shaped biconvex bar. It is found that overall loss of the biconvex bars is in general about 15% of the loss for the rectangular case for small angles of attack. For large angle of attack this difference diminishes. Of interest for the biconvex bars is also a local minimum in the head loss for angles approximately greater than 20˚ and for a blockage P around 0.35. This combination of parameters gives a low loss together with an efficient barrier for debris and fishes.

Place, publisher, year, edition, pages
Scientific Research Publishing, 2017. Vol. 9, no 5, 412-426 p., 76642
National Category
Engineering and Technology Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-65457DOI: 10.4236/eng.2017.95024OAI: oai:DiVA.org:ltu-65457DiVA: diva2:1137908
Note

Validerad;2017;Nivå 1;2017-09-05 (rokbeg)

Available from: 2017-09-02 Created: 2017-09-02 Last updated: 2017-09-06Bibliographically approved

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