Numerical Analysis of Dispersed Bubbly Flows in the Blade Passages of a Centrifugal Pump

摘要

A numerical analysis, comprising momentum and continuity equations for gas-liquid two-phase flow with a standard k-ε turbulence model to account for the presence of the dispersed phase, is performed to the prediction of bubbly flow in a centrifugal pump impeller. The governing equations are discretized by the control volume approach which insures the conservative characteristics to be satisfied in the calculation domain, and solved by a modified SIMPLE algorithm. The distributions of the void fraction obtained are considerably higher and uneven in the space just after the suction-surface region of the impeller inlet. Three-dimensional calculations in the pump impeller are performed for the void fraction profiles across the blade passages for various inlet gas loading conditions ranging from 3% to 7%. Results of three-dimensional analyses for the case of pressure distribution and two-phase bubbly flowfields in the blade passage of a centrifugal pump are compared with the existing experimental data and reasonable agreement is obtained.