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Modeling and Prototype Testing of Flows over Flip-Bucket Aerators
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Hållbar utveckling, miljövetenskap och teknik, Resurser, energi och infrastruktur.
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Hållbar utveckling, miljövetenskap och teknik, Resurser, energi och infrastruktur.
2018 (engelsk)Inngår i: Journal of Hydraulic Engineering, ISSN 0733-9429, E-ISSN 1943-7900, Vol. 144, nr 12, artikkel-id 04018069Artikkel 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 and avoid subatmospheric air cavities enclosed by the jets. In terms of jet breakup and stability, the physical models and the prototype lead to contradicting conclusions. With sealed aerators, the models exhibit intact air cavities featuring negative air pressure, suggesting the aeration need. Computational fluid dynamics (CFD) is performed to determine the reason for the discrepancy. Both the prototype observations and CFD indicate that the jets break up as a result of air entrainment; the resulting cavity air-pressure drops are insignificantly small. The discrepancy is due to the small model scale, in which the threshold flow velocity for air entrainment is not met and the prerequisite for jet breakup does not exist. To correctly reproduce similar water-air flow phenomena, the model should be large enough to meet the air-entrainment criterion. When questioning a small-scale model with air-cavity formation, CFD simulations should be performed to check the model results and make corrections, if needed.

sted, utgiver, år, opplag, sider
ASCE-AMER SOC CIVIL ENGINEERS , 2018. Vol. 144, nr 12, artikkel-id 04018069
Emneord [en]
Spillway, Aerator, Jet oscillation, Model tests, Prototype tests, Computation fluid dynamics (CFD)
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-238106DOI: 10.1061/(ASCE)HY.1943-7900.0001531ISI: 000447254300004Scopus ID: 2-s2.0-85053633622OAI: oai:DiVA.org:kth-238106DiVA, id: diva2:1277810
Merknad

QC 20190111

Tilgjengelig fra: 2019-01-11 Laget: 2019-01-11 Sist oppdatert: 2019-01-11bibliografisk kontrollert

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