Aeration and De-Aeration at Bottom Aeration Devices on Spillways

Chanson, Hubert (1994) Aeration and De-Aeration at Bottom Aeration Devices on Spillways. Canadian Journal of Civil Engineering, 21 3: 404-409.

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Author Chanson, Hubert
Title Aeration and De-Aeration at Bottom Aeration Devices on Spillways
Journal name Canadian Journal of Civil Engineering   Check publisher's open access policy
ISSN 0315-1468
Publication date 1994-06-01
Sub-type Article (original research)
Volume 21
Issue 3
Start page 404
End page 409
Total pages 6
Language eng
Subject 290802 Water and Sanitary Engineering
300105 Applied Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)
290899 Civil Engineering not elsewhere classified
290800 Civil Engineering
Abstract Aeration devices are introduced along chute spillways and at bottom outlets to prevent cavitation damage in high velocity flows. Bottom aerators are characterised by large quantities of air entrained along the jet interfaces but also by a strong de-aeration process near the impact of the water jet with the spillway bottom. In this paper, the aeration and de-aeration occurring respectively in the aeration region and in the impact region are reviewed. A re-analysis of air concentration data obtained on models provides information on the flow characteristics at the end of the impact region. These results enable an accurate initialisation of the downstream flow calculations using the method developed by CHANSON (1989b).
Keyword bottom aeration devices
aerators
spillways
air entrainment
detrainment
References CHANSON, H. (1988). "A Study of Air Entrainment and Aeration Devices on a Spillway Model." Ph.D. thesis, Ref. No. 88-8, Dept. of Civlil Eng., University of Canterbury, New Zealand, Oct., 239 pages. CHANSON, H. (1989a). "Study of Air Entrainment and Aeration Devices." Jl of Hyd. Research, IAHR, Vol. 27, No. 3, pp. 301-319. CHANSON, H. (1989b). "Flow downstream of an Aerator. Aerator Spacing." Jl of Hyd. Research, IAHR, Vol. 27, No. 4, pp. 519-536. CHANSON, H. (1990). "Study of Air Demand on Spillway Aerator." Jl of Fluids Eng., Trans. ASME, Vol. 112, Sept., pp. 343-350. CHANSON, H. (1991). "Aeration of a Free Jet above a Spillway." Jl of Hyd. Research, IAHR, Vol. 29, No. 5, pp. 655-667 & Vol. 29, No. 6, p. 864. CHANSON, H. (1993). "Self-Aerated Flows on Chutes and Spillways." Jl of Hyd. Engrg., ASCE, Vol. 119, No. 2, pp. 220-243. CUI, L. (1985). "Air Concentration Distribution downstream of Aeration Ramp." Shuili Xuebao (Jl of Hydraulic Engrg.), Beijing, China, Vol. 1, pp. 45-50 (in Chinese). DENG, Zhenghu (1988). "Problems of Flood Relief/Energy Dissipation and High-Velocity Flow at Wujiangdu Hydropower Station." Intl Symp. on Hydraulics for High Dams, IAHR, Beijing, China, pp. 230-238. FALVEY, H.T. (1990). "Cavitation in Chutes and Spillways.." USBR Engrg. Monograph, No. 42, Denver, Colorado,USA, 160 pages. HAGER, W.H. (1992). "Spillways, Shockwaves and Air Entrainment - Review and Recommendations." ICOLD Bulletin, No. 81, Jan., 117 pages. KELLS, J.A., and SMITH, C.D. (1991). "Reduction of Cavitation on Spillways by induced Air Entrainment." Can. Jl of Civ. Engrg., Vol. 18, pp. 358-377. Discussion : Vol. 19, pp. 924-929. LOW, H.S. (1986). "Model Studies of Clyde Dam Spillway aerators." Research Report No. 86-6, Dept. of Civil Eng., Univ. of Canterbury, Christchurch, New Zealand. PAN, S.B., SHAO, Y.Y., SHI, Q.S. and DONG, X.L. (1980). "Self-Aeration Capacity of a Water Jet over an Aeration Ramp." Shuili Xuebao (Jl of Hyd. Engrg.), Beijing, China, No. 5, pp.13-22 (in Chinese). (USBR translation No. 1868, book No. 12,455, paper No. 2). PETERKA, A.J. (1953). "The Effect of Entrained Air on Cavitation Pitting." Joint Meeting Paper, IAHR/ASCE, Minneapolis, Minnesota, Aug. 1953, pp. 507-518. RUSSELL, S.O., and SHEEHAN, G.J. (1974). "Effect of Entrained Air on Cavitation Damaged." Can. Jl of Civil Engrg., Vol. 1, pp. 97-107. RUTSCHMANN, P., VOLKART, P., and WOOD, I.R. (1986). "Air Entrainment at Spillway Aerators." Proc. of the 9th Australasian Fluid Mech. Conf., Auckland, New Zealand, Dec. 1986, pp. 350-353. SHI, Q., PAN, S., SHAO, Y., and YUAN, X. (1983). "Experimental Investigation of Flow Aeration to prevent Cavitation Erosion by a Deflector." Shuili Xuebao (Jl of Hydraulic Engrg.), Beijing, China, Vol. 3, pp. 1-13 (in Chinese). TAN, T.P. (1984). "Model Studies of Aerators on Spillways." Research Report No. 84-6, Univ. of Canterbury, Christchurch, New Zealand. WOOD, I.R. (1985). "Air Water Flows." Proc. of the 21st IAHR Congress, Melbourne, Australia, Keynote address, pp. 18-29. ZHANG, Shoutian (1991). "Latest Developments in Hydraulic Design of Outlet Works in China." Bulletin Institutionen for Vattenbyggnad, Kungl Tekniska Hogskolan (Hyd. Engrg. Royal Inst. of Technol.), Stockholm, Sweden, No. TRITA-VBI-154. ZHOU, Lintai, and WANG, Junjie (1988). "Erosion Damage at Fengman Spillway Dam and Investigation on Measures of preventing Cavitation." Intl Symp. on Hydraulics for High Dams, IAHR, Beijing, China, pp. 703-709.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown
Additional Notes Originally published as CHANSON, H. (1994). "Aeration and De-aeration at Bottom Aeration Devices on Spillways." Can. Jl of Civil. Eng., Vol. 21, No. 3, June, pp. 404-409 (ISSN 0315-1468). Copyright 1994 NRC Research Press. All rights reserved. No part of this publication may be reproduced, stored, or transmitted in any form or by any means, without the written permission of the publisher, except as stated below. The National Research Council of Canada grants permission to individuals to download or print single copies of articles for personal use. Any person may reproduce short excerpts from articles in the journals for any purpose that respects the moral rights of authors, provided that the source is fully acknowledged. As a courtesy, the consent of authors of such material should be obtained directly from the author. Authorization to reproduce items for other than personal use, as stated above, is granted by the National Research Council of Canada provided that the copyright fee of $7.00 per copy is paid directly to CANCOPY, One Yonge Street, Suite 1900, Toronto, ON, Canada M5E 1E5. The above permission does not extend to other kinds of copying, such as copying for general distribution, for advertising, or promotional purposes, for creating new collective works, or for resale. For such copying, arrangements must be made with the publisher, National Research Council of Canada, Ottawa, ON K1A 0R6, Canada. For British Crown copyright articles, permission for other than private research, study or in-house use must be obtained from The Copyright Unit, St. Clemens House, 2-16 Colegate, Norwich, England NR3 1BQ.

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Civil Engineering Publications
 
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Created: Wed, 19 Oct 2005, 10:00:00 EST by Hubert Chanson