CFD simulation and performance study of a three-separation combined air classifier

This paper mainly uses ANSYS-Fluent 19.2 software to simulate the movement of the airflow in a three-separation combined classifier. The simulation results indicate that the airflow is uniformly distributed in the V-classifier under the action of dispersion plates and baffles. As the airflow enters the rotor channel, the tangential velocity of the airflow increases uniformly and remains stable in the axial direction, providing a stable centrifugal force field for particle classification. From the analysis of the flow field and particle trajectories, the separation interface between the upward path for particles and the downward path for coarse particles is relatively clear. The experimental results with sodium bicarbonate show that the V-classifier has a good pre-classification effect. The rotor cage speeds of 300 rpm and 500 rpm are the best working conditions for the coarse powder and fine powder collection, respectively. This study not only provides a new strategy for the design and development of air classifier, but also provides theoretical guidance for its application in industrial production.