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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Comparison of chute aerator effect on stepped and smooth spillways
Comparison of chute aerator effect on stepped and smooth spillways
Author : TERRIER S.(1), PFISTER M.(2) & SCHLEISS A.J.(3)
ABSTRACT
Bottom chute aerators are installed to prevent cavitation damages and they have been studied in detail on smooth
spillways. In parallel, stepped spillways became widespread in the past decades. Research has shown that stepped
spillways may be endangered even more by cavitation than smooth spillways, particularly for high unit discharges. As a
consequence and besides issues of energy dissipation, the unit discharge of stepped spillways is usually limited to lower
values than on smooth spillways. In order to overcome that limitation, flow aeration ĘC mainly at the beginning of the
chute ĘC is necessary. Until now only fragmentary guidelines exists for the design of such aerators.
Systematic tests with bottom chute aerators on stepped spillway are performed on a physical model. A deflector is used
to separate the jet from the bottom in order to produce slight negative air pressures. A horizontal slot located in the
vertical face of the first step allows for air supply underneath the flow. In addition of the global air entrainment by the
aerator, the local air concentrations are spatially measured downstream of the deflector. The resulting air concentration
distribution allows the investigation of air transport and detrainment as well as the streamwise average and bottom air
concentration. The present paper discusses a test with a typical aerator and compares it with a reference test without
aerator and a test on a smooth chute with a similar aerator.
File Size : 638,007 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 19/08/2015
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