... system head characteristics 系统阻力特性 system-head curve 管网特性，系统压力特性曲线 systemic contamination 系统污染 ...
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Factors affecting constant pressure difference control method and advantages and disadvantages of the control plan are analyzed theoretically through pipe system head curve and pump performance curve.
根据管道水力特性曲线与水泵的性能曲线，运用理论分析的方法，对影响末端定压差控制方式的因素和该控制方案的利弊进行了分析。
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。
The continuum functional relationships among system efficiency, blade Angle, static head and flow rate of pumps are established based on the performance curve surface fitting method.
本文基于曲面拟合构造了装置效率、叶片角度与装置扬程和流量的连续函数关系，可以迅速准确地确定某一装置扬程和流量所对应的装置效率等参数。
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