PREDICTION OF SAND MOTION AND EROSION IN CENTRIFUGAL PUMPS

摘要

To investigate the particle motion in the impeller and particle erosion on the walls in a centrifugal pump, a Eulerian-Lagrangian hybrid model has been developed and applied in the present study. the complex three-dimensional flow field is investigated by employing the Eulerian incompressible version of the Dawes' 3D Navier-Stokes code. The dispersed particles are traced using the Lagrangian method based on the equations of translational and rotational motions which are exact within certain formal limits containing the Coriolis and centrifugal forces. Inter-particle collisions (including particle-wall collisions) are modeled via a hard-sphere model. Based on above assumptions, distributions of collision frequency, velocity and angle between particles and the walls in the impeller can be obtained through the present simulations. The predictions of erosion are in good agreement With the experimental results. The present algorithm can be extended to predict particle motion and erosion in other turbomachines.