两段变曲率叶型离心泵设计研究

基于Fluent泵内部全流场数值模拟及性能预测，对IS65—40—200型泵进行了两段变曲率叶型改型尝试．分析了加短叶片前后两段变曲率叶型离心泵性能的变化规律，发现加短叶片后泵的扬程明显提高且效率基本相同．对比了具有不同改型比例的两段变曲率叶型离心泵的性能，分析改型比例对泵性能的影响，确定了改型比例范围．分析了改型前后泵性能的变化规律，总结了两段变曲率叶型离心泵改型方法．提出了两段变曲率叶型离心泵的设计方法：先设计一台基础离心泵，且基础泵最高效率点的流量在小流量区域，再在此基础上改型设计．通过样机试验，验证了此设计方法的可行性．研究表明：两段变曲率叶型离心泵比同设计参数的普通离心泵尺寸小，轴向力低

Research on centrifugal pump with double curvature blade

The full flow numerical simulation was carried out with Fluent software to predict the pump per- formance. The modification efforts on IS65-40-200 centrifugal pump were proposed to analyze the method of the modification and change law of centrifugal pumps with double curvature blades. The short blade＇s effect on centrifugal pump with double curvature blade was analyzed. Head is much higher as short blade added, and efficiency is almost the same. By contrasting different models＇ performance with different changing proportion, the best proportion was founded. The method used to design centrifugal pumps with double curvature blades is proposed： A centrifugal pump is designed firstly with the best efficiency point at lower flow rate point and then is modified. A double curvature centrifugal pump is designed and tested, and the results validate the method. It is proved that the radial size of centrifugal pump with double curva- ture blade is smaller than the normal one of common design as well as the axial force.