The influence of blade outlet angle on the performance of centrifugal pump with high specific speed

The blade outlet angle beta(2) is one of the key design parameters of the centrifugal pump, which has an important influence on the internal flow field and performance of centrifugal pump. In this paper, five impeller models with different blade outlet angles (23 degrees, 25 degrees, 27 degrees, 29 degrees and 31 degrees) were built by Solidworks and CFturbo under the premise of other impeller parameters unchanged, and numerical simulation of high specific speed (n(s) = 192) pump was carried out in the commercial code ANSYS-CFX. Then the experiment was performed to test the hydraulic performance of centrifugal pump. The results show that the change trend of numerical simulation and experiment is similar, and when the flow rate increases gradually, the hydraulic loss of impeller becomes larger with the increase of blade outlet angle, and the blade outlet angle has obvious influence on the efficiency of centrifugal pump at high flow rate. Besides that, it has small influence on the head, which changes relatively larger at low flow rate than that at high flow rate. And all the research results could provide appropriate reference for designers to select reasonable outlet angle.