Numerical Simulation Of The Pump Sump And Inlet Conduit

The pump sump and inlet conduit is one of the important parts of pumping system. It is the transit section between the front pool and pump blades, the function of which is to adjust the water flow and make it change direction and accelerate as smoothly as possible, and to satisfy the designing requirements. The bad flow situation in the pump sump and inlet conduit will lead to the phenomena of dropping flow and swirling inside the pump with the results of uneven pressure distribution in the blades, and the increase of energy loss inner the pump and the deterioration of the cavitations. In order to predict the pump operating character, it is necessary to know how the pump sump and inlet conduit affects the pump's inner flow.This paper systemically study on the hydraulic characteristic of the pump sump and inlet conduit.The standardκ-εturbulent model is applied to simulate the turbulent flow of typical opening pump sump. An optimizing function is put forward, and the basal flow conditions are obtained. The design parameters of pump sump are analyzed to how to influent the hydraulic performance and flow pattern. The recommended measurements of the pump sump are presented. The RNGκ-εturbulent model is applied to simulate the turbulent flow of elbow conduit and campaniform conduit. The basal conditions of flow and pressure are obtained. Through computing inlet conduit by conditions, internal three-dimensional flow characteristics are achieved and hydraulic performances are predicated. The link of features condition and internal flow are analyzed, and the named height of elbow conduit and campaniform conduifor are presented. The results of simulation are in food agreement with the experimental data.