الفهرس 
Hydraulic Jump
CONCLUSIONS AND RECOMMENDATIONSOnly 14 pages are availabe for public view
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Abstract
Hydraulic jumps (HYDRAULIC JUMP) occur in most hydraulic structures. They are considered an effective tool for energy dissipation downstream (D.S) hydraulic structures such as weirs, spillways and sluice gates of regulators. This study introduces a new technique to increase the energy dissipation and reduce the floor length of the stilling basin of the hydraulic structure. This technique is done by placing a pendulum sill downstream of the sluice gate of the hydraulic structure at different longitudinal locations from the gate. The experimental work of this study was carried out in the irrigation and Hydraulics Engineering Laboratory, Faculty of Engineering, Ain Shams University, Cairo, Egypt. A re-circulating flume system allows changing the pendulum sill location with respect to the vertical gate, the gate opening and the passing discharge. A cylindrical steel sill with a constant diameter of 3 cm and fixed weight was used. The location of the pendulum sill, the flow discharge, and the gate opening were changed during the experimental work. The discharge was measured by using a rectangular sharp crested weir, the discharge capacity ranged between 2 and 4 L/sec as this is the maximum discharge can be obtained from the used pump. The experimental results showed that using the pendulum sill increases the energy losses of the jump by a range from 6% up to 40% depending on initial Froude number and reduces the jump length by about 15 %. It was also found that the best location of the pendulum sill is in the second half of the hydraulic jump length depending on the initial Froude number. Finally, an equation to predict the relationship between the two conjugate depths and initial Froude number was driven and verified with the results of the experimental work.