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=5.4 m3/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=4.8 m3/s）下的效率最高，达到71.09%,对应的扬程为1. 345 m,泵 装置高效区运行的流量范围较大。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。

For a new type of bi-directional ultra-low lift pump device which can be used for two-way pumping, the CFX software was used to perform three-dimensional flow numerical simulation. The internal flow characteristics of the pump device were analyzed and the overall performance of the pump device was predicted. The calculation results showed that under the designed condition (flow Q=4. 8 m3/s) and the large flow condition (flow Q=5. 4 m3/s) , the flow velocity uniformity at the impeller inlet section reached about 90%. The flow pattern at the impeller inlet section was good enough to ensure the performance of the water pump. The flow line at the outlet section of the diffusion guide vane was smooth, and the recovery of the flow velocity circulation by the diffusion guide vane was good. The hydraulic loss of the inlet water of the pump device was small, while the hydraulic loss of the outlet water was large. The device had the highest efficiency (71. 09%) under the designed working condition (flow Q=4. 8 m3/s), while the corresponding lift was 1. 345 m. The flow range in the high-efficiency zone of the pump device was relatively large,and the highest efficiency exceeded 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 was a desirable scheme in the riverside and lakeside areas along the river where gravity drainage and the actual lift was very low.

国家自然科学基金(51279173)；调水工程建设运行管理关键技术研究(SDSLKY201705)；江苏省水利科技项目(2017031)；江苏 高校优势学科建设工程资助项目(PAPD)