中文摘要：

为了探讨在导叶出口剩余环量影响下轴伸式出水流道的水力性能,对不同水力模型及不同叶片安放角下的后置轴伸式泵装置采用全结构化网格进行了数值模拟计算,并与实验结果对比验证模拟结果的可信度。对轴伸式出水流道的水力性能进行了分析,发现轴伸出水流道内部流态受导叶出口剩余环量的影响较大,尤其是对小流量工况。水力损失系数不再是某一常数,而是受流态分布相关的一变量。通过对比不同叶片安放角及不同比转数叶轮的出水流道进口断面平均涡角与水力损失系数关系发现,轴伸式出水流道的水力损失系数与进口断面的平均涡角存在一最优值,本次模拟计算下2副叶轮的最优平均涡角4°~5.3°下的水力损失系数为1.62×10~（-4）m·s~2/L~2。通过分析静压与总压沿流线方向的变化趋势明确了小流量工况下环量是引起水力损失的原因,而在大流量工况下流量是引起水力损失的主要原因。

英文摘要：

In order to research the hydraulic performance of the post position S-shaped shaft outlet conduit under the influence of circulation,the hydraulic performance of the post position S-shaped shaft pumping station under different blade models and different blade angles was simulated with commercial CFD software,and the experiment results were compared with the CFD results. The analysis of hydraulic performance of S-shaped outlet conduct showed that the inner flow field was strongly affected by the residual circulation of guide vane,the coefficient of hydraulic loss was no longer a constant,but a variable which was related to flow field. By comparing the relationship of the average swirl angle in the inlet and the hydraulic loss coefficient of the outlet conduit,it was found that an optimal average swirl angle existed for hydraulic loss coefficient. And the optimal average swirl angle was about 4° ~ 5. 3° for two different blades models,and the hydraulic loss coefficient was 1. 62 × 10~（-4）m·s~2/ L~2. By analyzing the static pressure and total pressure distribution curve,the conclusion below can be drawn： the mainly reason for the hydraulic loss was average swirl angle value at the small discharge,on the contrary the reason for the large hydraulic loss was velocity at large discharge. After the water flowing through the second corner,most of the kinetic energy is recovered. The research result gave a good suggestion for the design and optimization of pump station.