Deflector Ski Jump Hydraulics
Publication: Journal of Hydraulic Engineering
Volume 134, Issue 5
Abstract
Ski jumps are a standard element of dam spillways for an efficient energy dissipation if takeoff velocities are large, and stilling basins cannot be applied. This laboratory study investigates the hydraulic performance of a triangular-shaped, rather than the conventional circular-shaped, bucket placed at the takeoff of ski jumps. The following items were addressed: (1) pressure head maximum and pressure distribution along the triangular-shaped bucket; (2) takeoff characteristics as a function of the bucket deflector angle and the relative bucket height including the lower and the upper jet trajectories; (3) jet impact characteristics in a prismatic tailwater channel including the shock wave formation and the height of recirculation depth below the jet cavity; (4) energy dissipation across the ski jump, from the approach flow channel to downstream of jet impact; and (5) choking flow conditions of the flip bucket. A significant effect of the approach flow Froude number, the relative bucket height, and the deflector angle is found. A comparison with previous results for the circular-shaped bucket geometry indicates a favorable behavior of the novel bucket design.
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References
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 134 • Issue 5 • May 2008
Pages: 562 - 571
Copyright
© 2008 ASCE.
History
Received: Mar 9, 2007
Accepted: Aug 28, 2007
Published online: May 1, 2008
Published in print: May 2008
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