In order to analyze the influence of outlet blade angles on the performances of a 25-150/2-30/N two-stage mining centrifugal pump, the steady turbulent flow fields in the pump with four groups of different outlet blade angles were simulated numerically based on the N-S equations and SIMPLE algorithm as well as the standard <i>k-ε</i> turbulence model. The pump performance curves were obtained, and the velocity and pressure distributions in these pumps were analyzed. The results show that outlet blade angle has a significant effect on the pump performance, specially, as the outlet blade angle increases, the head rises gradually, and however, the shaft power tends to be saturated. Although the low pressure area located at the impeller inlet expands, the high pressure area at the impeller outlet shrinks. Meanwhile, the low velocity area on the blade pressure side increases, and even vortexes appear there. Moreover, the Stodola slip factor is correlated to outlet blade angle for the first and second stage impellers, respectively by means of regression method.
CAO Wei-Dong,ZHANG Yi-Ning,YAO Ling-Jun. Influence of outlet blade angel on performance of centrifugal pump and correction of slip factor[J]. Journal of Drainage and Irrigation Machinery Engin, 2017, 35(9): 755-.