中文摘要：

为比较竖井与轴伸贯流泵装置的水力特性,借助大型商用CFD软件在水泵水力模型、导叶以及流道总长度保持不变的情况下,对竖井和轴伸贯流泵装置进行了数值仿真模拟计算,并对竖井式贯流泵装置外特性进行了试验验证,试验结果表明设计工况点扬程和效率的模拟结果和试验误差在1%以内,非设计工况误差偏大。计算结果表明：进水流道水力损失较小但是能够影响着水泵性能的发挥,竖井与轴伸进水流道出口的面积加权均匀度分别为92.8%、95.2%,1.25倍设计流量工况下,叶轮的效率在竖井内比在轴伸贯流泵装置内效率最多低1.3%。出水流道的水力损失较大并影响着泵装置的性能曲线,轴伸与竖井出水流道水力损失最大值出现在0.59倍设计流量工况点,此时轴伸出水流道内水力损失值为0.459 m,竖井直管出水流道内水力损失值为0.741 m,轴伸贯流泵装置效率比竖井高了3.5%。算例中扬程以1.27 m为分界线,扬程低时竖井贯流泵装置整体性能较好,扬程高时轴伸贯流泵装置性能较好。该研究可为低扬程泵站的选型提供参考。

英文摘要：

By keeping the blade and guide vane model unchanged, and the same length of the whole pumping system, in this paper, we simulated the hydraulic performance of the vertical shaft and shaft extension tubular pumping system with the commercial CFD software, and the experiment of vertical shaft tubular pumping system was done to verify the numerical calculation, the head and efficiency difference between model test and CFD was less than 1% under design flow condition, but large under undersign flow condition. By comparing the performance of independent impeller and pumping system of the vertical shaft, we found that the efficiency of independent impeller was high and the highest value was 92.09% at the design point, and the efficiency of pumping system was easily effected by hydraulic loss in the passage inlet, passage outlet and guide vane. The highest efficiency happened when the head was 2.69 m and reduced to 76.2% when the hydraulic loss in the passage inlet, passage outlet and guide vane was 0.46 m. The result showed that the hydraulic characteristic was different with the influence of different inlet and outlet conduit. The hydraulic loss of inlet conduit was less, but the victory distribution in the outlet section of the inlet conduit had a relationship with the characteristic of blade. The hydraulic loss of outlet conduit was large, and it affected the hydraulic performance of pumping system. The result of the performance indicated that the efficiency of the shaft extension pumping system was 5.3% lower than vertical shaft under 1.25 design flow condition, but was 4.5%, 3.5% higher under 1.0, 0.59 design flow condition. When only considering the hydraulic performance of the blade, the hydraulic performance of shaft extension tubular pump was slightly higher just under large flow condition. By analyzing the inlet velocity distributions, we found that when the motor position was in back, the water flow on the inlet of the impeller was near to the hub due to the water guide cone. When the motor position was in f