Hydraulic Performance of Step Aerator
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Volume 134, Issue 2
Abstract
The step aerator for stepped chutes was recently introduced. Its purpose is to preaerate the zone between the spillway crest and the point of incipient bottom aeration to counter cavitation damage for relatively large unit discharges. The shape of the step aerator is optimized herein by hydraulic modeling to design the air supply and to indicate the aerator blockage characteristics. The shape and the performance of the improved step aerator are described in terms of air supply and the development of air-water flow on the stepped chute. Further, step insets are considered to reduce the spray formation on stepped chutes for small unit discharges, in combination with the step aerator. The performance of the step insets was investigated and their effect on the spray formation analyzed. The step aerator generally increases the maximum spray height at smallest discharges as compared to the standard stepped chute without step aerator. Insets over the first five steps significantly reduce spray relative to standard stepped chutes.
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Acknowledgments
The second writer was supported by the Swiss National Science Foundation, Grant No. UNSPECIFIED200021-101548/1.
References
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 134 • Issue 2 • February 2008
Pages: 127 - 134
Copyright
© 2008 ASCE.
History
Received: May 23, 2006
Accepted: Apr 9, 2007
Published online: Feb 1, 2008
Published in print: Feb 2008
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