流量曲线特点，提出了旋喷泵叶轮的优化设计数学模型、叶轮优化设计方法及水力参数的设计原则。
The mathematical model, the method for optimizing design, and the design principle of hydraulic parameters are proposed to make head-flow curve flat.
给出了管输效率与流量、水力坡降与流量的关系曲线。
The relations of pipeline efficiency versus flowrate and that of hydraulic slope versus flowrate are drawn.
轴流泵叶片水力矩随流量变化的关系曲线存在一个马鞍区，并与流量-扬程曲线的马鞍区相对应。
There exists a saddle type zone in the hydraulic moment curve of axial-flow pump blades which corresponds to the saddle zone of discharge-head characteristic curve of the pump.
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