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CFD modeling of two-phase flow of a spillwaychute aerator of large width
KTH, School of Architecture and the Built Environment (ABE). (Hydraulic and Hydrologic Engineering)ORCID iD: 0000-0001-7631-3503
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Resources, Energy and Infrastructure. (Division of Concrete Structures)ORCID iD: 0000-0002-4242-3824
2016 (English)In: Journal of Applied Water Engineering and Research, ISSN 2324-9676, E-ISSN 2324-9676, Vol. 4, no 2, p. 163-177Article in journal (Refereed) Published
Abstract [en]

An aerator is frequently used to prevent cavitation damages in high-velocity spillways. To understand its characteristics,one often resorts to physical model tests. To complement physical model tests, computation fluid dynamics simulations areused to determine water–air flow behaviors.With Bergeforsen’s 35 m wide aerator, numerical modeling has been performedto evaluate its performance and improve its configuration. The parameters of interest include spillway discharge capacity,air entrainment rate, duct subpressure and air concentration in the aerated flow. The simulated discharge capacity agreesreasonably with experimental data. Due to the larger chute width, empirical formulas do not reasonably predict the airdemand. To provide the air required by the aerator, its distribution in the cavity must be guaranteed. We thus looked into theair supply system and the air flux in the cavity to improve the aerator function. Larger vent openings in the middle of thechute are preferable for large-width aerators.

Place, publisher, year, edition, pages
2016. Vol. 4, no 2, p. 163-177
Keywords [en]
spillway; chute aerator; air demand; air–water flow; CFD; subpressure
National Category
Water Engineering
Research subject
Civil and Architectural Engineering
Identifiers
URN: urn:nbn:se:kth:diva-258931DOI: 10.1080/23249676.2015.1124030OAI: oai:DiVA.org:kth-258931DiVA, id: diva2:1350409
Note

QC 20190917

Available from: 2019-09-11 Created: 2019-09-11 Last updated: 2019-09-17Bibliographically approved

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Teng, PenghuaYang, James

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