Influences of component structures of axial flow pump on its performance

The impacts of component structures of axial flow pump on its performance were investigated based on the k-s epsilon turbulent flow model and the Reynolds averaged N-S equation with CFX software to numerically simulate threedimensional flow.It can help us to find key components in the pump design.The results showed that an elbow shape flow inlet can ensure continuously water movement,makes the flow uniformity of impeller reach 90 or more and the efficiency of the impeller about 92%.The hydraulic loss of the entire inlet passage depends on the hydraulic loss of the elbow and accordingly the hydraulic loss generated by the outlet passage is the largest among the entire pump.The main hydraulic losses mainly come from the bend and the outlet.Therefore,inflow bend section and the outlet are the key components of the pump design.In the outlet channel,the vorticity decreases along the path,and reached its maximum magnitude in the curved section where the flow rate also reached its smallest.

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