关键词: 搅拌混合器 , 时均速度 ,  数值模拟 ,  湍动能

Abstract: The turbulent flow characteristic in a stirred mixer with propeller was predicted based on multi-reference frame by using CFD turbulent model. Some detailed information about the velocity and turbulence kinetic energy was obtained. The simulated results show that the mean velocities increase firstly then decrease as radial position increasing, while the values of mean velocities close to the impeller are larger which were found in good agreement with the experimental results reported in the literature. Though the velocity distributions at different axial position above the stirrer are also much smoother, the values of velocity increase firstly then decrease in the discharged zone. The turbulence in the discharged zone tends to be nonuniform and the magnitude of the turbulent kinetic may have 7~9 times difference at the same axial or radial position. It is priority to select propeller for the axial speed field as main field, long distance transmission compared with traditional typical three-blade impeller of 45°.

Key words: Mean velocity ,  Numerical simulation ,  Turbulence kinetic energy