关键词: 卧螺离心机, Euler模型, 速度场, 数值模拟

Abstract: Based on the Euler model for multiphase flow，the flow field in a decanter centrifuge was simulated and analyzed with a computational fluid dynamics software，Fluent，using RNG k-ε turbulence model in a multiple coordinate reference system. Results showed that the tangential velocity increased quickly after the liquid flowed into the drum and reached a stable flow state along a relatively short distance，and the tangential velocity varied slightly along the drum axis. In addition，the axial velocity gradient along the radial was small in the cylindrical section of the drum，and large in the conical section. In the area near the drum，the axial velocity in the conical section of the drum was higher than that in the cylindrical section. The radial velocity was found to be complicated with no obvious regularity，and it was greatly affected by geometric structure.

Key words: decanter centrifuge, Euler model, velocity field, numerical simulation