明确了这种影响主要体现在三个方面，即泵的水力效率及其动力性能和理论扬程。
It is clear that the influence has mainly three aspects, hydraulic efficiency, dynamic properties and theoretical delivery lift.
叶片型线的选择应满足边界层不分离条件及由欧拉方程——泵的基本方程所确定的理论扬程条件。
The choice of vane curve should satisfy the conditions of boundary layer non-separation and theoretical distance head by Eular equation-the basic equation of pumps.
本文从理论和实例出发，分析了在不降低效率的前提下，提高泵扬程系数的条件。
Based on the theory and the experience, the requirements for increasing the head coefficient under the condition of maintaining the efficiency were proposed in this paper.
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