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.
[1]
R. M. Khatsuria.
Discussion of ¿Ski Jump Hydraulics¿ by Valentin Heller, Willi H. Hager, and Hans-Erwin Minor
,
2006
.
[2]
T. C. Paul,et al.
Measures to Contain Throw of Flip Bucket Jet in Installed Structures
,
1981
.
[3]
B. H. Rajan,et al.
Design of Trajectory Buckets
,
1980
.
[4]
Willi H. Hager,et al.
Flip Bucket without and with Deflectors
,
2000
.
[5]
R. M. Khatsuria.
Hydraulics of Spillways and Energy Dissipators
,
2004
.
[6]
W. Hager,et al.
Ski Jump Hydraulics
,
2005
.
[7]
Valentin Heller,et al.
Closure to "Ski Jump Hydraulics"
,
2006
.