中文摘要：

为了研究水泵变速运行装置内部水力特性变化,采用CFX软件对平面S形轴伸泵装置进行全过流部件数值模拟计算,转速分别为1 050、1 250、1 450 r/min。结果表明,不同转速下装置叶轮进口流速均匀度变化很小,进水流道水力损失变化规律不变。3种转速下出水流道小流量工况水流旋转运动强烈,设计工况流线较平顺,大流量工况水流贴壁运动明显。水泵转速增加后,出水流道水力损失最小值增大,对应的流量也加大。3种转速下,出水流道水力损失与装置扬程之比δ均在泵装置最优工况最小,且均为0.055左右,相差不大。通过断面涡量云图比较,变转速对导叶出口断面涡量影响很大,对应该断面涡量某一数值时,水力损失有最小值。泵装置变转速等效率曲线近似为抛物线,装置外特性基本符合比例律的关系。

英文摘要：

In order to study the influence of rotational speed on inner hydraulic performance of S-shaped shaft ex- tension pumping system, the whole flow passage of pumping system were simulated based on CFX software. Ro- tational speeds were 1 050 r/min, 1 250 r/min and 1 450 r/min respectively. The results showed that at different speeds velocity distribution of impeller inlet had little change and the changing regularity of hydraulic loss of in- let passage kept unchanged. Flow rotated strongly at the small flow rate condition. Streamline was smooth at the efficiency condition and water moved tending to wall obviously at the large flow rate condition. After rotational speed increased, minimum value of hydraulic loss of outlet passage increased and the flow rate was also in- creased. Under the three kinds of rotational speeds, the ratio of hydraulic loss of outlet passage to pumping sys- tem head （~） was minimal at the efficiency condition and all was 0.055, which had little difference. According to the comparison of panel vorticity contour, rotational speed had a great influence on vorticity of guidevane outlet. When vorticity had a certain value, the hydraulic loss of the outlet passage was minimal. Equivalent efficiency curve with variable speeds of pumping system was like a parabola. External characteristics of pumping basically fit the system proportional law.