Research on the operating characteristics of multistage series-parallel centrifugal pumps
In order to study the working characteristics of pump systems in series and parallel connection,a series-parallel combination consisting of three pumps with dual inlet and dual outlet was designed.The energy characteristics of each pump were analyzed through experiments and numerical simulation.The research results indicate that by monitoring the flow rate of each pump under different flow rates in Mode 3,it is found that the flow distribution pattern between the two first-stage pumps in parallel connection is not the same,and the difference between the flow rates of the two pumps shows a pattern of first increasing and then decreasing with the increase of flow rate.Meanwhile,the head of outlet 1 is close to that of M2,the max.difference is 0.188 Hd,the head difference from M1 is relatively big,and the max.difference is 1.139 Hd.Through the analysis,it is found that the head of outlet 2 basically does not change with the working conditions,but its head fluctuates due to the influence of the mixed flow regime of the two first-stage pumps in parallel connection in the upstream.The research results can provide reference for the design and improvement of complex series-parallel centrifugal pump systems.
centrifugal pumpseries-parallelenergy characteristicsflow rate distributionbest efficiency point
万方数据
维普
