Optimal Design Of Centrifugal Pump Impeller Anti-cavitation Based On CFD

Centrifugal pump is widely used in modern ships, it accounts for a large prop-ortion of the ship’s manufacturing and energy consumption.The centrifugal pump im-peller cavitation has been one of the important reasons that affect the performanc-e of the centrifugal pump. In this paper, the CFD method is used to analysis and c-alcula the internal flow field of the centrifugal pump, an optimized design to impr-ove the cavitation resistance of the centrifugal pump impeller is proposed, which is of great significance in the study of the centrifugal pump.In this paper, three parameters are selected for our analyzation and calculatio-n:the number of blades of the centrifugal pump impeller, width of imports and the s-hape of import, the main work is as follows:1. Studying the structural characteristics of the centrifugal pump, analyzing the causes and hazards of the centrifugal pump cavitation, know about the present statu-s of research on the cavitation resistance of the centrifugal pump both home and a-broad;2. To master the three-dimensional mechanical design software Solid Works and related modeling methods, modeling the impeller and volute flow using SolidWorks;3. Gridding the impeller and volute flow model with using preprocessor for CF D software GAMBIT, including import and export settings and interface settings;4. Import gridding flow model entities into the fluent software for internal flo-w field analysis, including setting the phy-sicalproperties of the medium, the bound-ary conditions and calculation methods;5. By analyzing the pressure and velocity maps of the impeller and volute flo-w by numerical simulation, combined with the analysis of the centrifugal pump hea-d and efficiency, an optimal design of the centrifugal pump impeller is proposed.The main conclusions drawn in this paper are as follows:the CFD analysis sho-ws that, increase the number of impeller blades appropriately; increase the width o-f imports properly in centrifugal pump; suitable impeller imported shape can improv-e the cavitation resistance of the centrifugal pump impeller, while keep other perfor-mance unaffected, even improved. When we design the mechanical structure of t-he centrifugal pump, using the CFD method to calculate the flow field performa -nce could compensate the defects of traditiona-1 design methods, shorten the resear-ch and design cycle effectively and reduce the design costs.