基于CFD的轴流泵后置导叶水力性能分析

为了解轴流泵后置导叶的水力性能,基于RNG湍流模型,采用计算流体动力学CFD软件Fluent,应用SIMPLIEC算法对轴流泵模型装置全流道进行了数值模拟,分析了四种不同流量下导叶体的内部流动特性,研究了导叶的水力性能。结果表明,导叶的水力损失随流量的增加先减小后增大;在设计流量处导叶水力损失最小,导叶压力转换能力最好;小流量下叶轮进出口处水流流态紊乱,导叶流道内出现漩涡回流,是导致导叶水力损失较大的主要原因;大流量下叶轮出口水流轴向速度较大,水流导叶进口边撞击将导致导叶体水力损失增加,水力性能下降。

Hydraulic Performance Analysis of Axial Pump Outlet Guide Vanes

For further study the hydraulic performance of guide vanes of axial pump, the RNG turbulence model and SIMPLEC algorithm were chosen in computation fluid dynamics software Fluent, three-dimensional numerical simulation was applied to investigate the axial pump flow characteristics. The flow characteristics of guide vanes were comparative analyzed under four different flow conditions. The results show that the hydraulic loss of guide vanes was first decrease then increase with the augmentation of flow rate; the guide vanes had a smaller hydraulic loss and higher pressure conversion capacity at the design point; the disorderly water flow of inlet and outlet of impeller and the reflux flow along the guide vanes were the main reason for the increase of hydraulic loss in low flow rate. In large flow rate, the water flow split at the inlet edge of guide vanes caused the hydraulic loss increase and low performance of guide vanes.