离心式流体机械内,特别是离心叶轮内部的流动相当复杂,单靠理论计算来正确预测叶轮内部流态和设计高效率的叶轮是有困难的。七十年代以来,运用三元流动理论和流动分析法求解叶轮内流场分布获得很大进展,但由于粘性对叶轮壁面的影响和叶轮出、入口的边界条件不易确定,计算结果与真实流动模型尚有一定差距。因此用实验方法 Centrifugal fluid machinery, especially the centrifugal impeller flow inside the complex, relying on theoretical calculations to correctly predict the flow pattern within the impeller and the design of high efficiency impeller is difficult. Since the 1970s, great progress has been made in solving the flow field distribution in the impeller using the three-dimensional flow theory and the flow analysis method. However, due to the influence of viscosity on the impeller wall surface and the boundary conditions of the impeller exit and entrance, the calculation results are not consistent with the real flow model There is still a certain gap. So using experimental methods