Research On Performance Prediction Of ZA80-50-160Centrifugal Pump And Its Optimization

As the fluid machinery, centrifugal pumps have been widely used in all aspects of the national economy. In recent years, with the rapid development of computer technology, CAD technology has been widely applied in the centrifugal pump design. CFD numerical simulation technology can be used to simulate the internal flow of the centrifugal pump and to predict its performance. In order to minimize the developmental costs and shorten the developmental period of products, combining CAD technology, CFD numerical simulation and optimization design methods is necessary. Then it is quick to get the three-dimensional model of centrifugal pumps quickly and to predict the performance of centrifugal pumps as well as optimizing its design.The main work and results are as follows:(1) The present situation of centrifugal pumps performance prediction method at home and abroad was summarized, as well as the developments of CFD numerical simulation and optimization design methods for pumps.(2) Pro/E was used to construct the models of centrifugal pumps accurately, Gambit was used to carry out the grids of the models, and Fluent was used to simulate.(3) Several centrifugal disk friction loss and volume loss calculation methods were compared, and one suitable method was chosen to process the numerical simulation results. Performance parameters in seven different conditions were obtained. In comparative analysis of the pump test data, the results showed that under the design conditions steady numerical simulation had higher prediction accuracy; the head error was only1.58%; the axis power error was3.17%; the efficiency error reached1.63%.(4) A depth analysis was made about the impeller and volute in static pressure, dynamic pressure, total pressure, turbulent kinetic energy and velocity vector contours.(5) On the basis of analyzing the pump performance, two optimization solutions were proposed to improve the efficiency of the pump. In the first optimization solution, an optimization function of impeller diameter D2, outlet blade placed corner β2, leaf number Z and the impeller outlet width b2was constructed. After optimization, the impeller size parameters were obtained. In the second optimization solution, the professional pump design software CFturbo was used to redesign the pump blades. After optimization, the impeller size parameters were obtained. According to the results of the two optimization solutions, the steady numerical simulation was made again. The result showed that:in the first solution, the optimized head downed0.59m and the shaft power downed0.15kW. The efficiency was improved by0.38%. In the second solution, the optimized head downed1.05m and the shaft power downed0.37kW. The efficiency was improved1.89%.