Study of Air Entrainment and Aeration Devices

Chanson, Hubert (1989) Study of Air Entrainment and Aeration Devices. Journal of Hydraulic Research, 27 3: 301-319.

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Author Chanson, Hubert
Title Study of Air Entrainment and Aeration Devices
Journal name Journal of Hydraulic Research   Check publisher's open access policy
Publication date 1989-01-01
Sub-type Article
Volume number 27
Issue number 3
ISSN 0022-1686
Start page 301
End page 319
Total pages 19
Language eng
Subject 290802 Water and Sanitary Engineering
290800 Civil Engineering
Abstract Cavitation erosion damage to spillway surfaces may be prevented with the use of aeration devices (aerators) introducing air in the layers close to the channel bottom in order to reduce cavitation damage. The performance of a spillway aerator are studied on steep spillway model with high velocities (from 4 m/s up to 15 m/s) and new air concentration and velocity measurements were performed. The data are presented and analysed developping new equations. The behaviour of the air demand relationship between the air discharge and the subpressure in the cavity beneath the nappe is analyzed. All these results provide a better understanding of the air entrainment processes above a spillway aerator and the quantity of air entrained can be obtained. Experimental data at the impact point of the jet are shown. The results indicate a strong deaeration process occuring in the impact region and reducing the effect of the aeration occuring above the aerator.
Keyword spillway
air entrainment
aeration device
air-water flow measurements
conductivity probe
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article
Collection: School of Civil Engineering Publications
 
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Created: Mon, 22 Aug 2005, 10:00:00 EST by Hubert Chanson