Abstract
The pressure in the hydraulic ram pump increases due to a sudden cessation of flow out through the waste valve when the waste valve is closing. The increasing of water hammer pressure is strongly influenced by velocity of the water flow in the drive pipe. Therefore, the waste valve has an important role in mechanism of the occurrence of water hammer pressure, performance, and flow patterns in the hydraulic ram pump. This study investigated the water hammer pressure and the flow patterns in the hydraulic ram pump that has been installed at Bon sub-village, as well as its performance at various strokes of the waste valve. In addition, CFD simulation using Ansys Fluent was conducted. The result show that increasing stroke of the waste valve increase the water velocity in the drive pipe and the water hammer pressure, and the optimum of the waste valve stroke has been predicted subject to volumetric and total efficiency using the equation of their trendlines. Furthermore, the flow patterns such as vortex, split flow, and blockage mass in the hydraulic ram pump have been identified.
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