关键词: 碟片式离心机, 离心分离, 流场, 数值模拟

Abstract: Flow field in the disc centrifuge is difficult to measure directly. Computational fluid dynamics（CFD）technology can be used to show the internal flow field characteristics of a disc centrifuge more intuitively. Based on the N-S equation and the standard two equation k-ε turbulent model，Fluent was used to simulate the flow in a DRS 230\4-00-99 disc centrifuge，including three-dimensional velocity and pressure. Results showed that the simulation of velocity distribution and pressure distribution agreed with the theory of internal basic law of disc centrifuge，rotation of liquid between the discs existed hysteresis，which was small because of small gap in disc. The disc centrifuge not only reduced the sedimentation distance of particles，but also improved the separation，and reduced rotation of liquid hysteresis. At the same time，the liquid flow rate and pressure drop were not evenly distributed in equidistance disc gap. Near the entrance position，the flow rate and pressure drop were greater，particularly in the first three layers. These findings could provide the reference for two-phase flow simulation of the disc centrifuge and have an important guidance for the centrifuge structure optimization design.

Key words: disc centrifuge, centrifugation, flow, numerical simulation