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(一)试验缘由建国以来,特别是七十年代以来,我市陆续兴建了大量的中、小型轴流泵站,其中仅20ZLB—70泵就有1916台。这些台站的建成,大大改善了农业生产条件,增强了抗灾能力。但是,这些泵站大多是按可能出现的最大扬程设计的,而在正常情况下,实际扬程远低于设计扬程,动力机往往负荷不足,水泵工作点偏离高效区,技术经济指标很低。而目前各水泵厂提供的小型轴流泵名曰半调节,实际上安装投入运行
(A) Tests Since the founding of the PRC, especially since the seventies, the city has gradually built a large number of medium and small axial-flow pump stations, of which only 20ZLB-70 pump has 1916 units. The completion of these stations has greatly improved agricultural production conditions and enhanced their resilience. However, most of these pumping stations are designed according to the maximum lift that may appear. Under normal circumstances, the actual lift is much lower than the design lift, and the power plant is often under-loaded. The pump operating point deviates from the high-efficiency area and the technical and economic indicators are very low. At present, the pump to provide small-scale axial flow pump name semi-regulation, in fact, put into operation