Flow and Bed-Shear Magnification Downstream of a Barrage with Swirl Generated in Ducts by Stators and Rotors
Publication: Journal of Hydraulic Engineering
Volume 143, Issue 2
Abstract
In this paper, the flow and bed shear stresses downstream of a tidal barrage, with open ducts and with swirl created by stators and rotors, are investigated experimentally. The wake created by open ducts is significantly three-dimensional within 20-duct diameters () from the barrage. Within of the barrage, the duct blockage and swirl also affect flow patterns and bed shear stress. Swirl affects jet mixing and local downstream circulation within 5-duct diameters (), resulting in large-scale cross-stream circulation further downstream. After , the flow becomes predominantly parallel and depth averaging would be appropriate. Bed shear stress just downstream of the barrage is magnified by up to 3, 7, and 12 times, respectively, for open ducts, stators alone, and rotors plus stators. This has major implications for sediment motion and scour.
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Acknowledgments
Support from the Doctoral Training Account of School of Mechanical, Aerospace, and Civil Engineering at the University of Manchester provided by the EPSRC is gratefully acknowledged.
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Published In
Journal of Hydraulic Engineering
Volume 143 • Issue 2 • February 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jul 22, 2015
Accepted: Jun 20, 2016
Published online: Sep 13, 2016
Published in print: Feb 1, 2017
Discussion open until: Feb 13, 2017
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