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前言轴流泵的比转速n_s为500～2000,国内外产品通常用n_s=500～1000,n_s>1000的泵为数很少。高比转速轴流泵可以增大流量和扬程,缩小泵的体积,从而减少金属材料消耗和制造工作量,节省土建投资,显著地提高综合技术经济效益。其发展缓慢的主要障碍是汽蚀破坏严重,可靠性差,使用寿命短。为此,国内外在改善轴流泵汽蚀性能方面,作了大量试验研究工作。我省在1969年建设的南京市武定门抽水站,采用了高比转速轴流泵,共安装46WZL——60泵10台,双向进出水流道,灌溉排涝两用。以后,相继建成的红山窑、马甸等三座抽水站,安装了同类型泵33台。经过长期运行,表明该泵机组效率低,汽蚀侵蚀严重,致使叶片与泵壳破损,检修工作量大,
Preface Axial pump speed n_s 500 ~ 2000, domestic and foreign products are usually used n_s = 500 ~ 1000, n_s> 1000 pump a small number. High specific speed axial flow pump can increase flow and lift, reduce the size of the pump, thereby reducing the consumption of metal materials and manufacturing workload, saving construction investment, significantly improve the overall technical and economic benefits. The main obstacle to its slow development is severe cavitation damage, poor reliability and short service life. To this end, at home and abroad to improve axial flow pump cavitation performance, made a lot of experimental research. Nanjing Wudingmen Pumping Station built in 1969, using a high specific speed axial flow pump, installed a total of 46WZL - 60 pumps 10, two-way access to water runoff, irrigation and drainage. Later, Hongdam kiln, Madian and other three pumping stations built in succession have installed 33 sets of pumps of the same type. After long-term operation, indicating that the pump unit is inefficient, cavitation erosion serious, resulting in damage to the blade and the pump casing, maintenance workload,