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Understanding Water Flows and Air Venting Features of Spillway: a Case Study
Vattenfall, R&D Hydraulic Laboratory, Älvkarleby, Sweden; Civil and Architectural Engineering, Royal Institute of Technology, Stockholm, Sweden .ORCID iD: 0000-0002-4242-3824
Civil and Architectural Engineering, Royal Institute of Technology, Stockholm, Sweden .ORCID iD: 0000-0001-7631-3503
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-0820-617X
Civil and Architectural Engineering, Royal Institute of Technology, Stockholm, Sweden .
2020 (English)In: Water, E-ISSN 2073-4441, Vol. 12, no 8, article id 2106Article in journal (Refereed) Published
Abstract [en]

For safe spillway discharge of floods, attention is paid to the water flow. The resulting air flow inside the facility, an issue of personnel security, is sometimes disregarded. The spillway in question comprises two surface gates and two bottom outlet gates lying right below. Air passages to the outlet gates include an original gallery and a recently constructed vertical shaft. To understand water-air flow behavior, 3D CFD modelling is performed in combination with the physical model tests. The simulations are made with fully opened radial gates and at the full pool water level (FPWL). The results show that the operation of only the bottom outlets leads to an air supply amounting to ~57 m3/s, with the air flow rates 35 and 22 m3/s to the left and right outlets. The air supply to the right outlet comes from both the shaft and the gallery. The averaged air velocity in the shaft and the gallery are approximately 5 and 7 m/s. If only the surface gates are fully open, the water jet impinges upon the canal bottom, which encloses the air space leading to the bottom outlets; the air flow rate fluctuates about zero. If all the four gates are open, the total air demand is limited to ~10 m3/s, which is mainly attributable to the shear action of the meeting jets downstream. The air demand differs significantly among the flow cases. It is not the simultaneous discharge of all openings that results in the largest air demand. The flood release from only the two outlets is the most critical situation for the operation of the facility. The findings should provide reference for spillways with the same or similar layout

Place, publisher, year, edition, pages
MDPI, 2020. Vol. 12, no 8, article id 2106
Keywords [en]
spillway, flood discharge, air-water flow, air demand, CFD
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-80252DOI: 10.3390/w12082106ISI: 000564738900001Scopus ID: 2-s2.0-85089482359OAI: oai:DiVA.org:ltu-80252DiVA, id: diva2:1455437
Note

Validerad;2020;Nivå 2;2020-08-18 (johcin)

Available from: 2020-07-24 Created: 2020-07-24 Last updated: 2023-08-28Bibliographically approved

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Xie, Qiancheng

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