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Transient Air-Water Flow and Air Demand following an Opening Outlet Gate
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Hydraulic Engineering. R&D Alvkarleby Lab, S-81426 Alvkarleby, Sweden.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Hydraulic Engineering.
2018 (English)In: Modelling and Simulation in Engineering, ISSN 1687-5591, E-ISSN 1687-5605, article id 3194935Article in journal (Refereed) Published
Abstract [en]

In Sweden, the dam-safety guidelines call for an overhaul of many existing bottom outlets. During the opening of an outlet gate, understanding the transient air-water flowis essential for its safe operation, especially under submerged tailwater conditions. Three-dimensional CFD simulations are undertaken to examine air-water flow behaviors at both free and submerged outflows. The gate, hoisted by wire ropes and powered by AC, opens at a constant speed. A mesh is adapted to follow the gate movement. At the free outflow, the CFD simulations and model tests agree well in terms of outlet discharge capacity. Larger air vents lead to more air supply; the increment becomes, however, limited if the vent area is larger than 10 m(2). At the submerged outflow, a hydraulic jump builds up in the conduit when the gate reaches approximately 45% of its full opening. The discharge is affected by the tailwater and slightly by the flow with the hydraulic jump. The flow features strong turbulent mixing of air and water, with build-up and break-up of air pockets and collisions of defragmented water bodies. The air demand rate is several times as much as required by steady-state hydraulic jump with free surface.

Place, publisher, year, edition, pages
HINDAWI LTD , 2018. article id 3194935
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-225225DOI: 10.1155/2018/3194935ISI: 000427596900001Scopus ID: 2-s2.0-85044092191OAI: oai:DiVA.org:kth-225225DiVA, id: diva2:1194958
Funder
Vattenfall AB
Note

QC 20180404

Available from: 2018-04-04 Created: 2018-04-04 Last updated: 2018-05-15Bibliographically approved

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Yang, JamesTeng, Penghua

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