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具有高抗汽蚀性能的轴流式叶轮或螺旋轮目前已经被广泛地用作高扬程离心泵的前置叶轮和低扬程增压泵(升压泵)的叶轮。但是值得注意的是,有关螺旋轮的理论并不十分完善,比如对于液体的粘度这样一个基本性能要素对叶片泵汽蚀性能的影响的问题研究就并非充分,而恰恰是这种因素能够改变液体的流场,因此能够改变泵的外特性。被抽送液体的粘度对叶片泵汽蚀性能的影响的试验研究结果具有自相矛盾的性质。比如按照文献[1,2]的结果得知,液体粘度的增大将会恶化泵的吸入性能,然而根据文献[3,4]的结果却会
Axial flow impellers or helical wheels with high cavitation resistance have been widely used as impellers for high-lift centrifugal pumps for front impellers and low-lift booster pumps (booster pumps). However, it is noteworthy that the theory about the helical wheel is not perfect. For example, the research on the influence of a basic performance factor such as liquid viscosity on the cavitation performance of the vane pump is not sufficient. It is precisely this kind of factor that can change the liquid Of the flow field, it is possible to change the pump’s external characteristics. The results of the experimental study on the effect of the viscosity of the liquid being pumped on the cavitation performance of the vane pump are self-contradictory. For example, according to the results of [1, 2], the increase of liquid viscosity will degrade the pump’s suction performance. However, according to the results in [3] and [4]