Experimental Analysis on the Use of Counterflow Jets as a System for the Stabilization of the Spatial Hydraulic Jump
Shokoofeh Sharoonizadeh,
Javad Ahadiyan,
Anna Rita Scorzini,
Mario Di Bacco,
Mohsen Sajjadi,
Manoochehr Fathi Moghadam
Affiliations
Shokoofeh Sharoonizadeh
Department of Hydraulic Structures, College of Water Science Engineering, Shahid Chamran University of Ahvaz, Golestan Boulevard, Ahvaz 61357-43311, Iran
Javad Ahadiyan
Department of Hydraulic Structures, College of Water Science Engineering, Shahid Chamran University of Ahvaz, Golestan Boulevard, Ahvaz 61357-43311, Iran
Anna Rita Scorzini
Department of Civil, Environmental and Architectural Engineering, University of L’Aquila, via G. Gronchi, 18-67100 L’Aquila, Italy
Mario Di Bacco
Department of Civil, Environmental and Architectural Engineering, University of L’Aquila, via G. Gronchi, 18-67100 L’Aquila, Italy
Mohsen Sajjadi
Department of Hydraulic Structures, College of Water Science Engineering, Shahid Chamran University of Ahvaz, Golestan Boulevard, Ahvaz 61357-43311, Iran
Manoochehr Fathi Moghadam
Department of Hydraulic Structures, College of Water Science Engineering, Shahid Chamran University of Ahvaz, Golestan Boulevard, Ahvaz 61357-43311, Iran
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.
