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Modeling and Prototype Testing of Flowsover Flip-Bucket Aerators
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
2018 (English)In: Journal of Hydraulic Engineering, ISSN 0733-9429, E-ISSN 1943-7900, Vol. 144, no 12Article in journal (Refereed) Published
Abstract [en]

The paper deals with a unique spillway which incorporates an aerator in each flip bucket with the intention to aerate the flow andavoid subatmospheric air cavities enclosed by the jets. In terms of jet breakup and stability, the physical models and the prototype lead tocontradicting conclusions. With sealed aerators, the models exhibit intact air cavities featuring negative air pressure, suggesting the aerationneed. Computational fluid dynamics (CFD) is performed to determine the reason for the discrepancy. Both the prototype observations andCFD indicate that the jets break up as a result of air entrainment; the resulting cavity air-pressure drops are insignificantly small. The discrepancyis due to the small model scale, in which the threshold flow velocity for air entrainment is not met and the prerequisite for jet breakupdoes not exist. To correctly reproduce similar water–air flow phenomena, the model should be large enough to meet the air-entrainmentcriterion. When questioning a small-scale model with air-cavity formation, CFD simulations should be performed to check the model resultsand make corrections, if needed.

Place, publisher, year, edition, pages
2018. Vol. 144, no 12
Keywords [en]
Spillway; Aerator; Jet oscillation; Model tests; Prototype tests; Computation fluid dynamics (CFD)
National Category
Water Engineering
Research subject
Civil and Architectural Engineering
Identifiers
URN: urn:nbn:se:kth:diva-258940DOI: 10.1061/(ASCE)HY.1943-7900.0001531OAI: oai:DiVA.org:kth-258940DiVA, id: diva2:1350442
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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