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空间导叶的进口冲角一般取3°～10°。但人们为了减小排挤、改善工艺性能,往往取较大的进口冲角,尤其是低比转速离心泵,空间导叶的进口液流角往往只有3°左右,而空间导叶的进口安放角仍取18°～20°左右,这就使得进口冲角大到15°～17°。过大的进口冲角使水泵效率大大降低。这个结论在水力学试验中早已有定论。但为什么在实际设计中还会错误地选择大冲角呢?究其原因主要是,设计者在设计时把减小叶片排挤和改善工艺性能放在了首位,同时把叶轮叶片进口冲角设计中的结论错误地用到了空间导叶的设计中来。在叶轮叶片进
Space guide vane angle of entry generally take 3 ° ~ 10 °. However, in order to reduce crowding and improve process performance, people often take a larger import angle of attack, especially at low specific speed centrifugal pumps. The inlet flow angle of the space guide vane is usually only about 3 °, while the inlet guide angle of the space guide vane Still taking 18 ° ~ 20 ° or so, which makes the import angle of attack to 15 ° ~ 17 °. Too large import angle of attack greatly reduced the efficiency of the pump. This conclusion has long been a conclusion in the hydraulics experiment. But why in the actual design will choose the wrong angle? The reason is mainly that designers in the design to reduce the vane extrusion and improve the performance of the process put the first place, while the import angle of the impeller blade design The conclusion mistakenly used in the design of the space guide vane. In the impeller blades into