输送黏性介质时叶轮出口角对泵性能的影响

为了研究离心泵在输送黏性介质时，叶轮出口角对泵性能的影响，采用FLUENT软件，对2种不同叶轮出口角的 离心泵，分别在清水和5种不同黏性的油性介质下，进行数值模拟分析，预测离心泵在各工况下的水力性能。结果表明： 输送介质为清水时，增大出口角能提高扬程但会降低水力效率；介质运动黏度介于10. 80~ 65. 00 mm2／s时，增加叶轮出 口角能同时提高扬程和效率；介质运动黏度≥65. 00 1111112/S时，增加出口角不能改善其水力性能。文章研究结果能改善 离心泵的水力设计方法，确保泵的高效运行。

Influence of Impeller Outlet Angles on Pump Performance When Pumping Viscous Medium

In order to study the influence of impeller outlet angles on pump performance when conveying viscous medium, numerical simulation was carried out for two centrifugal pumps with different outlet angles when pumping water and five kinds of oil with different viscosity by using Fluent. The performance of the pumps was predicted. It was found that increasing the outlet angles could improve the head but reduce the efficiency when pumping water. When the kinematic viscosity was between 10. 80 mm2/s and 65. 00 mm2/s, increasing the outlet angle could not only improve the head but also improve the efficiency. However, when the kinematic viscosity was over 65.00 mm2/S, increasing the outlet angles could not improve the hydraulic performance. The research can help improve the hydraulic design method of centrifugal pumps and ensure the efficient operation of the pumps.