Performance Evaluation of Large-Scale Double-Suction Centrifugal Pump Based on CFD

This paper studies the declining efficiency of the large-scale double-suction centrifugal pump, which is caused by cavitation erosion and other reasons. The research took 1200s-56 double-suction centrifugal pump as an example, used Pro/Engineer to construct the three dimensional model of its passage flow line, then deployed ANSYS ICEM CFD to divide the mesh, and finally adopted FLUENT for simulation. In using CFD, Reynolds Time-averaged Navier-Stokes formula was used to describe the flow in the water pump, k-ε turbulence model and wall function were used to analyze the three dimensional turbulence, and segregated implicit of pressure coupling equations was used for calculation. The research shows the distribution of flow velocity in the blade, the pressure distribution and the distribution of the full passage flow line. The law of the flow in the large-scale double-suction centrifugal pump is analyzed. By comparing CFD simulation results and test results, it can be perceived that when the design traffic performance is 1.0Q, the error of delivery head and efficiency is the smallest, which is 1.75% and 2.27% respectively. In addition, the efficiency change also tallies with the general working principle of the pump, which suggests that CFD numerical simulation can reflect the internal flow status in the large-scale double-suction centrifugal pump. Therefore, simulation results can be used to modify the pump.