Document Type : Article
Authors
1
Department of Civil Engineering, Isfahan University of Technology
2
Professor, Department of Civil Engineering, Isfahan University of Technology
3
Civil Engineering - Water and Hydraulic Structures Engineering, Faculty of Civil & Environmental Engineering, Tarbiat Modares University, Tehran, Iran
10.24200/j30.2024.64524.3330
Abstract
One of the most common hydraulic structures to dissipate the excess destructive flow energy is stilling basin of the hydraulic jump type. Compared to the other types of stilling basins, due to the reduction of flow per unit arc length, in circular stilling basins the hydraulic performance is improved, that can be more efficient if comprised a number of baffle blocks on the bottom of the basin. Most of the former researches on circular hydraulic jump stilling basins have focused on categorizing their types and hydraulic characteristics and recommended some limited design guidelines, overlooking effectiveness of the baffle blocks inside a circular hydraulic jump. Considering positive effect of the baffle blocks on improving the hydraulic characteristics of the classical and radial hydraulic jumps, it is expected that compared to the typical circular basins, a circular stilling basin with baffle blocks would be more efficient. Therefore, identification of the hydraulic characteristics of the circular stilling basins with baffle blocks still needs further investigation. The present experimental study subjects to investigate hydraulic characteristics of the circular hydraulic jump-type stilling basins with the angled baffle blocks. Examining the hydraulic characteristics of the circular stilling basins with baffle blocks, empirical relationships are derived for the sequent depth ratio and the relative energy loss in the circular stilling basins with baffle blocks. The extracted empirical equations are evaluated, applying sensitivity and error analyses. The physics of the phenomenon, effects of the prevailing dimensionless parameters, and the profile of the jump surface are also discussed. Furthermore, the present results are compared with those of the other types of stilling basins. The characteristics of the circular stilling basins with the baffle blocks, such as the sequent depth ratio and relative energy loss increase and the relative jump length decreases compared to the classical hydraulic jump type stilling basins. The present study is a starting point for investigation of the circular hydraulic jumps in a plunge pool. More experimental/theoretical studies are obligatory to analyze the hydraulic characteristics of the circular hydraulic jumps, changing the bottom slope, the flow discharge, and the water free-surface profile
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