一、前言用传统方法进行离心式、混流式泵叶轮的设计,正确确定叶片厚度对液流的排挤影响至为重要。一台普通的中、小型水泵叶轮,由于叶片厚度的排挤影响,会造成液流角比不计厚度时增加2°～10°以上。液流角计算的偏差将直接影响到叶片安装角设计的偏差,从而不能达到设计所预期的流动状态。这是造成某些叶轮最佳试验工况点远离设计工况点的重要原因之 I. Preface The design of centrifugal and mixed-flow pump impellers by the traditional method is very important to correctly determine the influence of blade thickness on the squeezing of the liquid flow. An ordinary medium and small pump impeller, due to the impact of squeezing the thickness of the blade, will result in the flow angle than when the thickness increases by more than 2 ° ~ 10 °. The deviation of the flow angle calculation will directly affect the deviation of the blade installation angle design, so that the designed flow state can not be achieved. This is the main reason that some of the impeller test points away from the design conditions point