Effect of different screen widths on the submerged hydraulic jump characteristics

Abstract

Hydraulic jump is used to dissipate excessive kinetic energy in natural water ways. Screens fixed in the stilling basin to control the hydraulic jump location, depth and length four decades ago. In this study, screens with a constant height and different widths with the same screen relative area (Ar=0.285) were located behind the gate at a distance of 10 cm and tested under wide variance conditions of submerged hydraulic jump. Screens with different relative widths are tested to select the best screen relative widths. The screen relative width of 1.00 had a maximum energy loss and shortest length with a minimum tail water depth of the submerged hydraulic jump. The theoretical deduced equation of the relative depth of the submerged hydraulic jump had a higher asymmetric scatter with the experimental results around the line of equality, however a good agreement was present when a correction factor was used.

Effect of Perforated Sills on Maximum Scour Depth Downstream From a Sluice Gate

“…The material used for the perforated sills is clear Perspex, which is chosen for its easy handling properties, then placed at a distance of 10 cm from the gate in a sudden expanding stilling basin with a constant expansion ratio (e=1.35) downstream the vertical gate [28]. The perforated sill with a width of 22 cm and a height of 3 cm, varying porosity (10.3%, 18.3%, 28.5%, and 41.1%), and an inclination angle of 90°w ere used to investigate the impact of perforated sill porosity on the maximum scour depth, which is achieved by three types of holes: circular (0.60, 0.80, 1.0, and 1.2 cm) diameter holes; rectangular and square holes are equal areas of the 1.2 cm diameter circular holes arranged by a uniform mesh as shown in Fig.…”

The Effect of Screen Wall on Flow Energy Dissipation: A Review​

“…The effect of varying screen widths on the properties of submerged hydraulic jumps was studied in research [28] in a 0.30-meter-wide, 0.468-meter-deep, and 15.6-meter-long channel. The effect of passing flow over changing screen area on the hydraulic jump performance was investigated using screens with a 22 cm width and a 3 cm depth.…”

Effect of Vertical Screen on Energy Dissipation and Water Surface Profile Using Flow 3D

“…This can be attained by expansions as by France (1981) [6], steps and roughened bed as by Bejestan and Neisi (2009) [7], pendulum sills as by Aya O. K [8]. (2018), Samah et al, (2019) [9] or using screen as by Suzan et al, (2021) [5].…”

“…Flow 3D software results is very close to the experimental results with maximum deviation of 13%. After verification of the software, the location, height and width of screen is fixed as recommended by Suzan et al (2021) [5]. Series of tests are carried out with different Froude Number and gate opening in order to study the effect of screen on energy dissipation and on the water surface profile.…”