针对可用于双向抽水的一种新型双向超低扬程泵装置，基于CFX软件对泵装置进行三维流动数值模拟,分析了泵装置的内部流动特性，并对泵装置的整体性能作出了预测。计算结果表明:在设计工况（流量Q=4.8m3/s）与大流量工况(流量Q=5.4m3/s)下，叶轮进口断面流速均匀度达到90%左右，叶轮进口断面流态良好，足以保证水泵的性能，扩散导叶出口断面流线较为平顺，扩散导叶对水流速度环量的回收较好。泵装置进水水力损失较小，出水水力损失较大。该装置在设计工况(流量Q=4.8m3/s)下的效率最高，达到71.09%，对应的扬程为1.345m，泵装置高效区运行的流量范围较大，最高效率超过现有同类型低微扬程泵装置5%以上。新型双向超低扬程泵装置在自流引排水且实际扬程很低的沿江滨湖地区,是一种可取的方案。

Aiming at a new type of bi-directional ultra-low lift pump device which can be used for bi-directional pumping, the three-dimensional flow numerical simulation of the pump device is carried out based on CFX software, the internal flow characteristics of the pump device are analyzed, and the overall performance of the pump device is predicted. The calculation results show that under the design condition (flow Q=4.8m3/s) and the large flow condition (flow Q=5.4m3/s), the flow velocity uniformity at the impeller inlet section reaches about 90%, the flow pattern at the impeller inlet section is good enough to ensure the performance of the water pump, the flow line at the outlet section of the diffusion guide vane is smooth, and the recovery of the flow velocity circulation by the diffusion guide vane is good. The hydraulic loss of the inlet water of the pump device is small, while the hydraulic loss of the outlet water is large. The device has the highest efficiency of 71.09% under the design working condition (flow Q=4.8m3/s) and the corresponding lift is 1.345m. The flow range in the high-efficiency zone of the pump device is relatively large, and the highest efficiency exceeds the existing low-lift pump device of the same type by more than 5%. The new type of bi-directional ultra-low lift pump device is a desirable scheme in the riverside and lakeside areas along the river where gravity drainage and actual lift are very low.

国家自然科学基金项目（面上项目，重点项目，重大项目）