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Numerical Investiga...
Numerical Investigation of Turbulent Flow through Rectangular and Biconvex Shaped Trash Racks
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- Åkerstedt, Hans O. (author)
- Luleå tekniska universitet,Strömningslära och experimentell mekanik
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- Eller, Sebastian (author)
- Luleå tekniska universitet,Strömningslära och experimentell mekanik
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- Lundström, Staffan T. (author)
- Luleå tekniska universitet,Strömningslära och experimentell mekanik
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(creator_code:org_t)
- Scientific Research Publishing, 2017
- 2017
- English.
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In: Engineering. - : Scientific Research Publishing. - 1947-3931 .- 1947-394X. ; 9:5, s. 412-426
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https://doi.org/10.4...
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Abstract
Subject headings
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- 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.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Keyword
- Strömningslära
- Fluid Mechanics
Publication and Content Type
- ref (subject category)
- art (subject category)
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