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一、引言泵的性能相似定律确认,同一台泵在转速改变后的两个相似工况点运行,其扬程与转速有如下关系: 泵的性能相似定律最初只是实验结果的总结形式,后来则从相似理论中获得了可靠的理论基础。从形式上看,定律的基本理论依据有两条:1.流道内的水流是运动相似的;2.相似工况点间的水力效率相等。但是,由于叶轮内的流动一般均在自模区,运
I. INTRODUCTION The similar law of pump performance confirms that the same pump runs at two similar operating conditions after the speed is changed. The lift and speed of the pump are related as follows: The law of similarity of pump performance is only the summary of experimental results, and then from Similar theory has been a reliable theoretical basis. From a formal point of view, the law has two basic theoretical basis: 1. Flow within the flow path is similar to the movement; 2. Similar conditions hydraulic efficiency is equal. However, since the flow in the impeller is generally in the mold area, it is transported