Numerical Study of the Axial and Radial Forces, the Stresses and the Strains in a High Pressure Multistage Centrifugal Pump

Mohand-Amokrane Abdelouahab, Guyh Ngoma, Fouad Erchiqui, Python Kabeya

Abstract

This paper deals with the numerical study of the axial and radial forces, the stresses and the strains induced by a liquid flow in a high pressure multistage centrifugal pump to improve their performances account for the material of the shaft and the impellers. Indeed, a model of a 4-stage centrifugal pump is developed considering a design point. The continuity and the Navier-Stokes equations are used for the liquid flow through the pump. Additionally, the equations of the stresses and the strains are applied for the shaft and the impellers. The obtained system of equations is solved by means of the CFX-code and the static structural analysis to determinate the fields of velocity and pressure, the axial and radial forces, the stress and the strain on the pump shaft. Moreover, numerical simulations are carried out to analyze the shaft behavior in terms of the induced axial and radial forces, the stresses and the strains. The diffuser in the last pump stage is used as parameter. Good trends are achieved comparing the obtained results with these found in the literature and these calculated using the classical equations of the stresses and the strains.

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