Considering the complexity and variation of mixed system in many processes in industry

a novel large-double-blade impeller with wide adaptability was developed.A computational fluid dynamics model describing the flow and mixing process was built

and the power

flow field and mixing characteristics in a stirring tank equipped with the novel impeller were simulated and analyzed.The simulation results show that in the flow field produced by the novel impeller

there are local circulating flows in the upper and lower blade zone and overall circulating flow through the whole tank.As the viscosity of mixing system increases

the fluctuations of axial

radial and tangential velocities in the flow field decrease

and its power and mixing performance remain good

which indicate that the novel impeller has a wide adaptability to flow regimes and viscosities.For the novel large-double-blade impeller

it is not beneficial to the global mixing when the feeding point is located close to liquid surface

so the feeding between the upper and lower blades is recommended in order to shorten the mixing time.The novel impeller is more efficient than the FZ impeller with the same dimension under the same power consumption per unit volume

so it is more competitive in energy conservation.The simulation will contribute a lot to the improvement and optimization of the structure and operation of the novel large-double-blade impeller.