The paper introduces the approximate formula for the head curve of pump, the pipe resistance curve of system and the efficiency of pump with relative value.

介绍了扬程特性、管阻特性和水泵效率的相对值近似表达式。

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From the performance perspective, the type of impeller and the general efficiency closed impeller or less the same, but the type of impeller pump head curve dropped more.

从性能上讲，该型式叶轮效率高和普通闭式叶轮相差不大，但用该型式叶轮泵扬程曲线较为陡降。

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From the performance perspective, the lower the efficiency of the impeller, the impeller is only equivalent to an ordinary closed around 70%, a relatively flat head curve.

从性能上讲，该叶轮效率较低，仅相当于普通闭式叶轮的70%左右，扬程曲线比较平坦。

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