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Modeling and Prototype Testing of Flowsover Flip-Bucket Aerators
KTH, Skolan för arkitektur och samhällsbyggnad (ABE). (Hydraulic and Hydrologic Engineering)ORCID-id: 0000-0001-7631-3503
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Hållbar utveckling, miljövetenskap och teknik, Resurser, energi och infrastruktur. (Division of Concrete Structures)ORCID-id: 0000-0002-4242-3824
2018 (engelsk)Inngår i: Journal of Hydraulic Engineering, ISSN 0733-9429, E-ISSN 1943-7900, Vol. 144, nr 12Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2018. Vol. 144, nr 12
Emneord [en]
Spillway; Aerator; Jet oscillation; Model tests; Prototype tests; Computation fluid dynamics (CFD)
HSV kategori
Forskningsprogram
Byggvetenskap
Identifikatorer
URN: urn:nbn:se:kth:diva-258940DOI: 10.1061/(ASCE)HY.1943-7900.0001531OAI: oai:DiVA.org:kth-258940DiVA, id: diva2:1350442
Merknad

QC 20190917

Tilgjengelig fra: 2019-09-11 Laget: 2019-09-11 Sist oppdatert: 2019-09-17bibliografisk kontrollert

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