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Modelling of air demands of a spillway aerator with two-phase flow models
Division of Resources, Energy & Infrastructure, Royal Institute of Technology (KTH), Stockholm, SwedenDivision of Resources, Energy & Infrastructure, Royal Institute of Technology (KTH), Stockholm, Sweden. Vattenfall R&D, Älvkarleby Hydraulic Laboratory, Älvkarleby, Sweden.
Division of Resources, Energy & Infrastructure, Royal Institute of Technology (KTH), Stockholm, Sweden.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-0820-617X
2018 (English)In: E-proceedings of the 2nd International Symposium on Hydraulic Modelling and Measuring Technology Congress, International Association for Hydro-Enviroment Engineering and Research (IAHR) , 2018Conference paper, Published paper (Refereed)
Abstract [en]

Air demand is an issue of concern for a spillway aerator. To numerically map its air-water flow behavior has a bearing on its design. The recently completed spillway at Bergeforsen features a 35-m wide chute aerator with 13 air vents. With this in background, CFD modelling is performed with three commonly used two-phase flow models, i.e. the Volume-of-Fluid (VOF) Model, Two-Fluid Model and Mixture Model. The purpose is to evaluate these models in terms of water-air flow properties. The simulations have shown that the VOF Model generates the lowest air demand, while the Two-Fluid Model points to a 34% higher value, which is attributable to the differences in the two-phase flow formulations. The resulting air pressure in the air cavity including the air groove leads also to considerable discrepancy in the vent air-flow distribution across the chute and spatial air concentration. Evaluations of two-phase models are necessary, so that a reliable model is adopted for engineering design.

Place, publisher, year, edition, pages
International Association for Hydro-Enviroment Engineering and Research (IAHR) , 2018.
Keywords [en]
spillway, aerator, air demand, two-phase model
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-72716OAI: oai:DiVA.org:ltu-72716DiVA, id: diva2:1283235
Conference
Second International Symposium on Hydraulic Modelling and Measuring Technology, 30 May-1 June, 2018, Nanjing, China
Available from: 2019-01-28 Created: 2019-01-28 Last updated: 2022-06-01Bibliographically approved

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Xie, Qiancheng

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