Abstract
To study the influence of blade profiles of the plastic centrifugal pump on pump performance, the impeller blade profiles were designed and drawn by the single arc method, double arc method, logarithmic spiral method, and B‐spline curve method, respectively, with the known structural parameters.The shape and size of four profiles were drawn, and two‐dimensional models and three‐dimensional models of four impellers and volute were completed, respectively. The impeller models were printed by 3D printing technology, and the performance experiments of the plastic centrifugal pump were carried out. The numerical simulation of the internal flow field was performed. From the contours of the velocity and pressure, the vapor volume fraction distribution, and fluid‐structure interaction analysis of impellers, the impeller drawn by the logarithmic spiral method was better than others. The optimization of the logarithmic spiral method was completed. The impeller inlet and outlet diameters (D1 and D2) and impeller inlet and outlet installation angles (β1 and β2) were taken as control variables, and the total power loss and the minimum NPSHr of the pump were taken as the objective functions. The optimization results were that D1 = 58 mm and D2 = 162 mm and β1 = 17° and β2 = 31°. The hydraulic efficiency was increased by 1.68%.
Highlights
As a type of general machinery, centrifugal pumps are widely used such as in mechanical engineering, aerospace, and petrochemical industries [1,2,3]. e flow components of plastic centrifugal pumps are made of engineering plastic, with less manufacturing costs and better corrosion resistance
E impeller is the core part of the centrifugal pump, and the impeller blade profile plays a vital role in the fluid flow which will directly impact the performance of centrifugal pumps
Tao et al [21] used the numerical method to study how the blade thickness influenced the flow characteristics in the impeller passages and volute casing. ey concluded that the pressure pulsations increased at the leading edges but decreased at the trailing edges according to the increase in the blade thickness
Summary
As a type of general machinery, centrifugal pumps are widely used such as in mechanical engineering, aerospace, and petrochemical industries [1,2,3]. e flow components of plastic centrifugal pumps are made of engineering plastic, with less manufacturing costs and better corrosion resistance. There have been many studies on the influence of the impeller parameters on the flow characteristics of centrifugal pumps [11,12,13,14,15,16,17,18,19,20]. Li et al [28] studied the influence of the blade angle of a low specific speed plastic centrifugal pump on the pump performance. Four design methods of blade profiles, which are the single arc method, double arc method, logarithmic spiral method, and B-spline curve method, are proposed and the influence of four kinds of blade profile on plastic centrifugal pump performance is studied. Four design methods of blade profiles, which are the single arc method, double arc method, logarithmic spiral method, and B-spline curve method, are proposed and the influence of four kinds of blade profile on plastic centrifugal pump performance is studied. e flow field simulation of pumps with various impellers is analyzed in detail
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