Prediction Of Pressure Coefficients For Flat Lip Vertical Gates

M. Ahmed, Thamir (2016) Prediction Of Pressure Coefficients For Flat Lip Vertical Gates. Second International Engineering Conference On Developments in Civil & Computer Engineering Applications 2016.

Text (Research Article) IEC2016.pdf - Published Version Download (21MB)

Abstract

The main function of dam structures is to regulate the discharges and heads of water required to satisfy the demand of power generation and water quantity supplied to river or stream behind the structure, hence the sluice gate will play the big role to achieve this process and then its design needs much more attention. The sluice gate within the tunnel of the dam is exposed to many types of static and hydrodynamic forces .Among these forces is the hydraulic downpull force which created from difference between downward force produced by flow passing over the top surface of gate and uplift force exerted by the jet flow on bottom gate surface . The evaluation of positive and / or negative downpull force values is important due to its effects on closure of the gate. The estimation of such force needs determination of many related parameters such as pressure distribution along and cross the bottom gate surface, top pressure ,jet velocity issuing below the gate ,operation head and the head downstream the gate shaft. In present research, the hydraulic model is used to carry out the required measurements and different types of gate lip shapes have been examined with various flow conditions and gate openings to evaluate the downpull force coefficient. The analysis of results assured that the geometry of the lip gate has significant effects on the hydrodynamics forces and consequently on its operation which in the case of its negative value will prevent the gate to close and make some failures and damages.

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