输送粘油时叶轮几何参数对离心泵性能的影响

试验研究了以叶片数及叶片出口角为代表的叶轮几何参数对离心泵输送粘性油性能的影响。在离心泵试验台架上，测量了输送不同粘度油品时不同叶片数及叶片出口角叶轮的外特性；对比了在泵送不同粘度介质时叶片数及叶片出口角对离心泵性能的影响程度。试验表明，叶片数与叶片出口角对离心泵性能的影响程度随输送油品粘度范围的不同而改变。分析可知，输送油品运动粘度低于１００×１０－６ｍ２／ｓ时，增大叶片出口角，能有效提高泵的输送能力；输送高粘油时，宜采用少叶片数叶轮。三叶片叶轮能在较大范围内延缓粘性对离心泵性能的影响。

Influence of geometric parameters of impeller on centrifugal pump performance in transferring viscous oil

The influence of such geometric parameters of the impeller as blade number and outlet blade angle on the performance of a centrifugal pump is investigated by test. The external characteristics of the impeller with different blade numbers and outlet blade angles in transferring oil of different viscosities are determined on the test stand, and the degrees of influence of blade number and outlet blade angle on pump performance in transferring media with different viscosities are compared. Test shows that the degree of influence of blade number and outlet blade angle on pump performance changes with the variation of the ranges of viscosities of the oil pumped. When the viscosity is less than 10010-6m2/s, the delivery capacity of the pump can be effectively improved by increasing the outlet blade angle; when high viscosity oil is transferred, impeller with less blades should be adopted. The influence of oil viscosity on the performance of centrifugal pump can be reduced to a large extent by using imp