Abstract: Computational fluid dynamics (CFD) method is applied to the study of flow field in stirred tank with double layer straight impeller, double layer inclined impeller and double layer straight and inclined impeller combined alternately. The laminar model is employed to simulate the flow field of the stirred tank with the fluid of glycerin mixed with water, and the flow structure in stirred tank with three different double layer impeller rotating at constant speed of 200 r/min is obtained. Comparison analysis is carried out to the axial, radial and tangent velocity vector plots, velocity contours and velocity distribution curves. The research provides the basis for the design and practical application of the stirred tank.

Key words: Double layer impeller, Inclined turbo-impeller, Laminar model, Numerical simulation, Stirred tank