Flow Downstream Sluice Gate with Orifice
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-0441-3
Hydraulic Engineering
Flow Downstream Sluice Gate with Orifice Ibrahim M. Mohamed
a
and Fahmy S. Abdelhaleem
b
Shoubra Faculty of Engineering, Benha University, Shoubra 11626, Egypt Benha Faculty of Engineering, Benha University, Benha 13512, Egypt
a
b
ARTICLE HISTORY
ABSTRACT
Received 11 March 2020 Revised 8 June 2020 Accepted 14 July 2020 Published Online 24 September 2020
Gates and orifices were significant common structures used in controlling and adjusting the flow in water system channels. Installing of an orifice with sluice gates, increase the flow discharge with minimizing the horizontal jets under gate that was attributed with higher bed flow velocity and larger scour geometry downstream these gates. An experimental study was conducted to examine the flow pattern and the bed configurations downstream sluice gates with an orifice. In this research, a circular orifice employed with sluice gates as a means of energy dissipation downstream the gates, was explored. Forty-five runs were completed under 3 discharges, 3 upstream water heads, and 7 tail gate water depths. Five models for sluice gate with orifice were utilized. A series of regime plots were created to help designing the sluice gate with orifice as heading up and flow distributions structures. The outcomes illustrated that combining of an orifice with sluice gates productively scattered the jump energy and diminished the downstream local scour compared to the conventional sluice gate. Additionally, existed equations used to predict the jump length downstream sluice gate were applicable in case of sluice gate with orifice provided similar flow conditions were achieved. The optimum ratio of orifice and under gate areas was also introduced.
KEYWORDS Sluice gate Gate opening Orifice Discharge coefficient Scour depth Hydraulic jump Energy dissipation
1. Introduction Discharge can advantageously be estimated by hydraulic structures for controlling discharge and water depth, as they made a coordinated connection between depth and discharge. Orifices and sluice gate were normally utilized flow control and metering devices. The sluice gate was a hydraulic structure utilized for this reason which enabled the flow to go underneath. Downstream free flow happened at a (moderately) huge proportion of upstream depth to the gate opening height. However, submerged flow at the downstream would happen for low estimations of this proportion. For an openly giving flow underneath a sluice gate, the water surface was very smooth while for a submerged flow, the comparing flow profile was amazingly harsh. With respect to flow under a sluice gate and the flow pattern at downstream including the discharge coefficient and the water jump as a hydraulic phenomenon, numerous works have been reported, for example, by Rajaratnam and Subramanya (1967) carried out experimental model to develop a general equation for prediction flow downstream sluice gate. Rajaratnam (1977) concluded t
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