长短叶片对液力透平性能的影响

为了研究长短叶片对液力透平性能的影响,制作了液力透平样机,搭建了开式液力透平实验台,对有、无长短叶片的叶轮分别进行了数值和实验研究。研究结果表明,长短叶片的增加可以提高液力透平的效率,增加最高效率点的流量,降低液力透平的扬程。内部流场分析表明,长短叶片的增加,可以改善叶轮内部流场分布,减小叶轮内部漩涡的区域和强度,改善液力透平内部流动规律。对液力透平内部功率损失分布分析表明,液力透平内部的功率损失主要集中在叶轮内部,长短叶片的增加,改善了叶轮内部流动,减小了叶轮内部的功率损失。叶片数的增加加剧了叶轮和蜗壳之间的相互作用,因此蜗壳内部的功率损失有所增加。

Effect of Splitter Blade on the Performance of Pump as Turbine

In order to find out the effects of splitter blades on the performance of pump as turbine, a pump as turbine and an open pump as turbine test rig were built. Research results showed that the addition of splitter blades could improve its efficiency, increase its flow rate at the best efficiency point and decrease its required pressure head. Internal flow field analysis showed that the flow field was improved and the area and intensity of vortex region was decreased with the increase of splitter blades. Power loss distribution analysis within pump as turbine showed that power loss within impeller took up the majority of the total power loss. The power loss within impeller was decreased when splitter blades were added to the impeller. With the increase of blade number, the interaction of impeller and volute was enhanced, so the power loss within volute was increased.