Reprojeto da tomada de sucção de uma bomba centrífuga com pré-filtro autoescorvante

Abstract

The present work refers to the redesign of the suction set of a centrifugal pump with self-priming pre-filter applied in swimming pool water filtration systems. The study was carried out in a pump manufactured by Eberle Equipamentos e Processos. In order to increase the efficiency of the set, the front cover profile was studied by applying the Computational Fluid Dynamics (CFD) through ANSYS Fluent software and using the k-ɛ turbulence and Shear Stress Transport (SST) models. In parallel, a self-priming pre-filter was developed using Boyle's Law for sizing priming tanks using a spreadsheet in Excel software. A prototype was fabricated and tests were carried out to define the flow curves x manometric height, the yields and the operation of the self-priming pre-filter. Analyzing the results obtained, it was observed that both models of turbulence used behaved very similar in the numerical simulation in relation to the real models, obtaining maximum differences in the SST of -4.7% and 7.0% in the current and prototyped models, being these values considered satisfactory for this study. The increase in yield reached 12% without the pre-filter and 9.5% with the pre-filter, being the target value of 10%. The set priming performed as expected, priming at 1 m above the water level. The methodologies used in this work were confirmed in the course of this work and can be applied in others centrifugal pumps (sic).