Abstract：A three-dimensional fluid domain computational model of the intake in a large-scale pump station was established based on volume of fluid(VOF)model in computational fluid dynamics method to analyze the flow pattern in the intake. The grid size independence was checked, then the flow pattern in the intake was simulated under design condition, and reverse flows were found in both sides of the intake. The reason for the reverse flows was analyzed. Based on this, flow patterns were calculated in the intakes with single vertical column, single bottom sill and both of them, and the advantages and disadvantages of these schemes were compared, eventually, the flow pattern variation characteristics were identified after these rectification measures were implemented. It was found that the rectification effect of the combined rectification scheme of vertical column and sill was more effective than that of the rest measures, and the water velocity distribution in the intake is more uniform in the former. Additionally, the combined rectification schemes with variable spacing between vertical column and sill were simulated, and the flow pattern and velocity distribution uniformity were analyzed and compared among different schemes. The results showed that when the bottom sill was placed in the position with 80% of the distance from the vertical column to the pump discharge pipe, the flow in the intake was more uniform under design condition. This result can provide a reference for hydraulic optimization measures of similar pump intakes.
