Physical Modeling of Ski-Jump Spillway to Evaluate Dynamic Pressure

The effects of changes in the angle of pool impact plate, plunging depth, and discharge upon the dynamic pressure caused by ski-jump buckets were investigated in the laboratory. Four impact plate angles and four plunging depths were used. Discharges of 67, 86, 161, and 184 L/s were chosen. For any d...

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Bibliographic Details
Published inWater (Basel) Vol. 11; no. 8; p. 1687
Main Authors Karami Moghadam, Mehdi, Amini, Ata, Malek, Marlinda Abdul, Mohammad, Thamer, Hoseini, Hasan
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.08.2019
Subjects
Buckets
Computational fluid dynamics
Dams
Dimensional analysis
Dynamic pressure
Energy dissipation
Experiments
Inspection
jet falling
Laboratories
physical modeling
Pressure
Pressure distribution
Pressure effects
pressure fluctuations
Spillways
surface disturbances
Vortices
water jet
Iran
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Summary:The effects of changes in the angle of pool impact plate, plunging depth, and discharge upon the dynamic pressure caused by ski-jump buckets were investigated in the laboratory. Four impact plate angles and four plunging depths were used. Discharges of 67, 86, 161, and 184 L/s were chosen. For any discharge, plunging depth and impact plate angle were regulated, and dynamic pressures were measured by a transducer. The results showed that with the increase in the ratio of drop length of the jet to its break-up length (H/Lb), and with an increase in the impact plate angle, the mean dynamic pressure coefficient decreased. An inspection of the plunging depth (Y) ratio to the initial thickness of the jet (Bj) revealed that when Y/Bj > 3, the plunging depth of the downstream pool reduced dynamic pressure. At the angle of 60°, the dynamic pressure coefficient due to increasing in plunging depth varied from 34% to 95%.
ISSN:2073-4441
2073-4441
DOI:10.3390/w11081687