叶片型线对离心黏油泵性能的影响

Influence of blade profile on performance of centrifugal oil pump

针对目前离心油泵的叶片绘型未考虑黏度因素影响的情况,采用FLUENT6.1软件通过数值计算方法研究泵送温度下运动黏度为1、24、60mm2/s 3种黏度的介质在包角分别为90°、110°、130°3种叶片型线对离心泵性能的影响.结果表明:随着叶片包角增大,扬程-流量曲线变得陡峭,相同流量下,泵扬程降低,且此特性与介质黏度无关;设计工况下,130°包角泵输水时的效率最高,而110°包角泵在最优工况下输黏油时效率最高;采用不同黏度的介质时,离心泵内部压力和速度分布与采用清水介质得到的规律基本一致.

Aimed at present situation of blade profile plotting of centrifugal oil pump that effect of liquid viscosity is not taken into consideration, the influence of blade profiles with three nose angle of 90°, 110°, and 130° respectively and medium viscosity of 1 mm2/s, 24 mm2/s, and 60 mm2/s, on the performance of centrifugal pump was investigated at pumping temperature. The result showed that with the increase of wrapping angle, H-Q curve became steep and the pump head decreases at the same flow rate in spite of the viscosity of the medium. With 130° wrapping angle, the water pump efficiency was the highest in design condition. With 110° wrapping angle, however, the oil pump efficiency is the highest. The pattern of internal pressure and velocity distribution was almost identical for water pump and pumping medium with different viscosity.