叶片数及分流叶片位置对离心泵性能的影响

应用CFD流场数值计算程序对两类不同长叶片、两类不同长短叶片和一类超短叶片配置的离心泵进行数值模拟,讨论叶片数、分流叶片不同径向位置及周向位置对离心泵内流场及整机性能的影响.结果表明,选择合理的叶片数和分流叶片的径向及周向位置,可以有效降低长叶片的负荷,有效提高泵的扬程和效率,避免叶片数过多引起的叶轮进口堵塞和叶轮流道内发生回流和漩涡.当离心泵分流叶片进口直径为叶轮直径的0.68,分流叶片向长叶片背面偏置5°,叶片数为4个长叶片和4个超短叶片时,离心泵的整体性能最佳.

Influence of blade number and splitter-blade position on performance of centrifugal pumps

Centrifugal pumps disposed with two kinds of long blades,two kinds of long and short mixed blades,and one kind of ultra-short blades were numerically simulated by using a CFD program of flow field numerical computation.The influence of blade numbers and radial/circumferential position of splitter-blades on pump's internal flow field and overall performance was discussed.The result showed that,when the numbers of blade and radial/circumferential position of the splitter-blades were reasonably selected,the load on the long blades could effectively be reduced,the pump lift and efficiency improved,and the blocking due to excessive numbers of blades at the pump intake as well as the backflow and vortices in impeller's flow passage avoided.The overall performance of centrifugal pumps would be optimal if the intake disposition diameter of splitter-blades to impeller diameter was 0.68,the splitter-blades were offset 5.0 the ratio of deg to the long blades,and the numbers of long and ultra-short blades were taken as four,respectively.