Influence of Modified Blade Outlet Shape on the Performance of Solid-Liquid Two-Phase Flow Centrifugal Pump
To investigate the impact of modified blade exits on the performance of solid-liquid two-phase flow pumps,a comparison was made with four different modification forms at a pump speed of 180 RPM using a centrifugal pump.Unsteady numerical simulations were conducted in ANSYS-CFX with the standard k-ε turbulence model.The analysis compared the external characteristics of the pump under different modification schemes and examined the effects of varying particle concentrations and diameters on the internal flow field,turbulent kinetic energy,and solid particle distribution.The study results indicate that the external characteristics under solid-liquid two-phase conditions are similar to those under clear water conditions,with a maximum efficiency difference of only 0.59％at the design operating point.However,the modified blade exit surface(YL2)improves the pump's hydraulic efficiency,while the modified blade exit back surface(YL3)increases the pump's head.Under solid-liquid two-phase conditions,the intensity of turbulent kinetic energy increases with higher particle concentrations,while at the same concentration,it decreases with larger particle diameters.Modification schemes YL3 and YL4 enhance the solid particle distribution between the front cover and the blade back,resulting in reduced wear.The YL3 scheme can be employed to design a solid-liquid two-phase flow centrifugal pump with optimal performance.
centrifugal pumpmodified blade outletturbulent kinetic energy distributionsolid-phase particle distribution
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