Experimental Investigation on a System of Crossbeams As Energy Dissipator in Abruptly Expanding Channels
Publication: Journal of Hydraulic Engineering
Volume 142, Issue 2
Abstract
Several studies have demonstrated that in abruptly expanding channels phenomena of flow asymmetry can arise under certain tailwater conditions. These undesired situations are characterized by high-velocity concentrations and backward flows in the tailwater channel. This paper presents some preliminary results of an experimental investigation carried out to study the effects of a system of crossbeams for improving the flow patterns in the tailwater channel. Four different beam spacings, two system orientations and slopes, two locations, and two beam heights were tested in order to define the most adequate geometry of the dissipator. It was found that, for almost all tested configurations, the presence of the crossbeams produced a significant improvement in the flow field in the channel, in terms of velocity distribution and stability under variable downstream conditions.
Get full access to this article
View all available purchase options and get full access to this article.
References
Alhamid, A. A. (2004). “S-jump characteristics on sloping basins.” J. Hydraul. Res., 42(6), 657–662.
Bremen, R., and Hager, W. H. (1993). “T-jump in abruptly expanding channel.” J. Hydraul. Res., 31(1), 61–78.
Bremen, R., and Hager, W. H. (1994). “Expanding stilling basin.” Proc. ICE Water Mar. Energy, 106(3), 215–228.
Ferreri, G. B., and Nasello, C. (2002). “Hydraulic jumps at drop and abrupt enlargement in rectangular channel.” J. Hydraul. Res., 40(4), 491–505.
Graber, S. (2006). “Asymmetric flow in symmetric supercritical expansions.” J. Hydraul. Eng., 207–213.
Hager, W. H. (1992). Energy dissipators and hydraulic jump, Kluwer Academic, Dordrecht, Netherlands.
Herbrand, K. (1973). “The spatial hydraulic jump.” J. Hydraul. Res., 11(3), 205–218.
Kordi, E., and Abustan, I. (2012). “Transitional expanding hydraulic jump.” J. Hydraul. Eng., 105–110.
Noseda, G. (1964). “An instability phenomenon of hydraulic jump in enlarging supercritical flow.” L’Energia Elettrica, 41(4), 249–254 (in Italian).
Ohtsu, I., Yasuda, Y., and Ishikawa, M. (1999). “Submerged hydraulic jumps below abrupt expansions.” J. Hydraul. Div., 492–499.
Rajaratnam, N., and Subramanya, K. (1968). “Hydraulic jumps below abrupt symmetrical expansions.” J. Hydraul. Div., 94(2), 481–503.
Unny, T. E. (1963). “The spatial hydraulic jump.” Proc., IX IAHR Congress, International Association for Hydro-Environment Engineering and Research (IAHR), 32–42.
Zare, H. K., and Baddour, R. E. (2007). “Three dimensional study of spatial submerged hydraulic jump.” Can. J. Civ. Eng., 34(9), 1140–1148.
Zare, H. K., and Doering, J. C. (2011). “Forced hydraulic jump below abrupt expansions.” J. Hydraul. Eng., 825–835.
Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 142 • Issue 2 • February 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jan 16, 2015
Accepted: Jul 26, 2015
Published online: Sep 14, 2015
Published in print: Feb 1, 2016
Discussion open until: Feb 14, 2016
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.