Validación del diseño de bombas centrífugas mediante métodos numéricos (Original)

The use of numerical simulations has developed the methods for the evaluation of turbomachinary performance, that's has been possible from the phase of design. The study case analyzed corresponds to a radial centrifugal pump of simple suction of one stage. On the simulation are analyzed the impeller and volute fluid domain, for this are established as contour condition: the inlet pressure, the caudal and the impeller rotation frequency. Results shows the pressure and velocity fluctuation values in the carcass due to the fluid impact with the cut water.  The difference between analytics and simulation result is 4.6 m.c.a.El empleo de simulaciones numéricas ha desarrollado los métodos para la evaluación del funcionamiento de turbomáquinas, siendo esto posible desde la etapa de diseño. El caso de estudio analizado corresponde a una bomba centrífuga radial de simple succión de una etapa. En la simulación se analizan los campos de flujo correspondientes al rodete y la voluta, para los que se establecen como condiciones de contorno: la presión de entrada, el caudal trasegado y la frecuencia de rotación del impelente. Los resultados muestran la fluctuación de los valores de las presiones y las velocidades del fluido de salida de la carcasa producto al impacto del fluido con la lengüeta.  La diferencia entre los resultados analíticos y las simulaciones es de 4,6 m.c.a

Investigation of Parameters Affecting Axial Load in an End Suction Centrifugal Pump by Numerical Analysis

The total force produced in the axial direction on a pump is called axial load and is caused by the pressure difference between the front and rear of the impeller and the hydrostatic force in the suction direction. In a centrifugal pump, 3D computer-aided analysis programs are used to design and reduce R&D and manufacturing costs. In this study, parameters affecting axial load of the centrifugal pump with a single suction and closed impeller were investigated by using the Computational Fluid Dynamics (CFD) method. In this context, the flow rate and the some physical properties such as the back gap of the impeller, wear ring and balancing holes, of the centrifugal pump were investigated to determine how much affected the axial load. The results showed that the wear ring and the balancing holes give rise to effective results on the axial load, while the back gap of the impeller does not affect the large extent. With the design changes made with these parameterizations, the axial force was reduced by up to 60%, whereas the efficiency was decreased by 5%. The loss of efficiency due to this decrease in axial force is negligible. However, higher efficiency values were also found at a different point from the working point where the axial load is lowest

Investigation of Parameters Affecting Axial Load in an End Suction Centrifugal Pump by Numerical Analysis

The total force produced in the axial direction on a pump is called axial load and is caused by the pressure difference between the front and rear of the impeller and the hydrostatic force in the suction direction. In a centrifugal pump, 3D computer-aided analysis programs are used to design and reduce R&D and manufacturing costs. In this study, parameters affecting axial load of the centrifugal pump with a single suction and closed impeller were investigated by using the Computational Fluid Dynamics (CFD) method. In this context, the flow rate and the some physical properties such as the back gap of the impeller, wear ring and balancing holes, of the centrifugal pump were investigated to determine how much affected the axial load. The results showed that the wear ring and the balancing holes give rise to effective results on the axial load, while the back gap of the impeller does not affect the large extent. With the design changes made with these parameterizations, the axial force was reduced by up to 60%, whereas the efficiency was decreased by 5%. The loss of efficiency due to this decrease in axial force is negligible. However, higher efficiency values were also found at a different point from the working point where the axial load is lowest