输送水时，叶轮切割后，泵的扬程、轴功率、效率都下降。
When pumping water, the head, shaft power and efficiency of the pump decrease with the reducing in impeller diameter.
指出切线泵的扬程系数与叶片数、喉部面积、集液器断面积的关系。
At the same times, the relationships of the head coefficient with the number of the blade, the throat area and the sectional area of the collector were analyzed.
随轴向间隙扩大，超小型泵的扬程系数、功率系数和效率都逐渐降低。
The head coefficient, power coefficient, and efficiency decreased with increasing axial clearance.
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