轴流泵装置分部结构对装置性能的影响分析

Influences of component structures of axial flow pump on its performance

基于k-ε紊流模型和雷诺时均N-S方程,运用CFX软件对轴流泵装置进行三维流动数值仿真计算,分析各分部结构对水泵性能及泵装置性能的影响,以找寻泵装置优化设计中的关键部件。计算结果表明,肘形进水流道能保证良好的进水条件,使叶轮进口流速均匀度达到90%以上,叶轮效率达到92%左右的较高数值。肘形进水流道的水力损失取决于弯肘段的水力损失;出水流道产生的水力损失在整个泵装置中占比最大,出水流道弯段和出口的水力损失为主要部分;因此进水流道弯段和出水流道是泵装置优化设计的关键部件。出水流道中涡量沿程减小,在流道弯段涡量下降最大,且流量越小下降的越大。

The impacts of component structures of axial flow pump on its performance were investigated based on the k-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 about92%.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.