Abstract
This study presents an investigation on the use of submerged counterflow jets as a means for stabilizing the spatial hydraulic jump occurring in abruptly expanding channels. The characteristics of the flow downstream from the stilling basin and the main parameters influencing the effectiveness of the device in improving flow uniformity and reducing scouring potential are examined in laboratory tests, under several geometric configurations and hydraulic boundary conditions. The position within the stilling basin and the jet density (i.e., the number of orifices issuing the counterflow jets) were found to be important parameters influencing the performance of the device. Overall, the results indicate that this dissipation system has promising capabilities in forcing the transition from supercritical to subcritical flow, by significantly shortening the protection length needed to limit the phenomena of instability associated with spatial hydraulic jumps.
Highlights
The formation of a hydraulic jump in stilling basins is frequently used as an energy dissipation system to reduce the scour downstream of hydraulic structures [1]
The comparison of βb and βb ·vmb 2 obtained with the installed device to the ones shown in Figure 3 provides direct information on the effectiveness of the counterflow jets in stabilizing the hydraulic jump occurring in the expanding channel
The present study has introduced a novel dissipator, based on the use of counterflow jets, able to significantly reduce the risk of flow asymmetry and instability phenomena jets, able to significantly reduce the risk of flow asymmetry and instability phenomena associated with the occurrence of spatial hydraulic jumps in abruptly expanding channels
Summary
The formation of a hydraulic jump in stilling basins is frequently used as an energy dissipation system to reduce the scour downstream of hydraulic structures [1]. Methods for enhancing the energy dissipation, and shortening the length of the basin, have been proposed in many studies These methods typically include the use of appurtenances, such as baffle piers, end sills, blocks, or roughness elements [2,3,4,5,6,7,8,9,10], while few studies examined the possibility of using bed water jets as a means of dissipation.
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