Hydraulic Investigation of Converged Ski-Jump Bucket in Presence of Dividing Wall

The ski-jump bucket is used as the energy dissipating structure at the end of the spillway or bottom outlet. In this study, both simultaneously and separately, the effect of the separator wall (as a whole (FSW) and the bucket splitter (BSW)) and the angle of the bucket convergence on the energy dissipation of the flow were investigated and their results were compared with conventional bucket model. For this purpose, four deflectors with a convergence angle of 10, 20, 30, and 40 degrees were made and embedded in the bucket, separately. The results showed that the ski-Jump bucket can dissipate the energy of flow between 65 and 60%. At the 20-degree convergence angle, the performance of the converged bucket increases by about 5 percent, whereas at the 30-degree, its performance decreases by about 15 percent. In general, as the discharge of flow increases, the energy dissipation decreases. Adding the BSW to the conventional and convergent buckets does not have a significant effect on flow energy dissipation, but adding the FSW to the convergent bucket eliminates the effect of reducing its performance due to convergence of the bucket.