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Article

Performance and Design of a Stepped Spillway Aerator

1
Stucky Ltd., Rue du Lac 33, CH-1020 Renens, Switzerland
2
Civil Engineering Department, Haute Ecole d’Ingénierie et d’Architecture de Fribourg (HEIA-FR, HES-SO), CH-1705 Fribourg, Switzerland
3
Laboratory of Hydraulic Constructions (LCH), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
*
Author to whom correspondence should be addressed.
Formerly, Laboratory of Hydraulic Constructions (LCH), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
Academic Editor: Michele Mossa
Water 2022, 14(2), 153; https://doi.org/10.3390/w14020153
Received: 28 October 2021 / Revised: 17 December 2021 / Accepted: 31 December 2021 / Published: 7 January 2022
(This article belongs to the Special Issue Advances in Spillway Hydraulics: From Theory to Practice)
Stepped spillways are frequently limited to specific discharges under around 30 m2/s due to concerns about potential cavitation damages. A small air concentration can prevent such damages and the design of bottom aerators is well established for smooth chutes. The purpose of this study is to systematically investigate the performance of a deflector aerator at the beginning of stepped chutes. Six parameters (chute angle, step height, approach flow depth, approach flow Froude number, deflector angle and deflector height) are varied in a physical model. The spatial air concentration distribution downstream of the aerator, the cavity sub-pressure, water discharge and air discharges are measured. The results describe the commonly used air entrainment coefficient, the jet length, as well as the average and bottom air concentration development to design an aerator. The lowest bottom air concentration measured in all tests is higher than the air concentration recommended in literature to protect against cavitation damages. And, unlike smooth chutes, there appears to be no significant air detrainment downstream of the jet impact. One deflector aerator seems therefore sufficient to provide protection of a stepped spillway. View Full-Text
Keywords: aeration; aerator; air concentration; air entrainment; cavitation; deflector; stepped chute; stepped spillways aeration; aerator; air concentration; air entrainment; cavitation; deflector; stepped chute; stepped spillways
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MDPI and ACS Style

Terrier, S.; Pfister, M.; Schleiss, A.J. Performance and Design of a Stepped Spillway Aerator. Water 2022, 14, 153. https://doi.org/10.3390/w14020153

AMA Style

Terrier S, Pfister M, Schleiss AJ. Performance and Design of a Stepped Spillway Aerator. Water. 2022; 14(2):153. https://doi.org/10.3390/w14020153

Chicago/Turabian Style

Terrier, Stéphane, Michael Pfister, and Anton J. Schleiss. 2022. "Performance and Design of a Stepped Spillway Aerator" Water 14, no. 2: 153. https://doi.org/10.3390/w14020153

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