新型贯流式谷物清选装置中气固两相流数值模拟

cross-flow air separation unit for grain was designed by employing the cross flow blower. Based on the standard k-ε turbulent model and particle dispersed phase model, the characteristics of gas-solid two-phase flow in the developed cleaning chamber were numerically simulated. The distribution of airflow velocity and particle trajectory was obtained by setting the boundary to the developed airflow model and utilizing the bidirectional coupling Lagrangian scheme to trace the particle movement. The results indicate that the airflow in the cleaning chamber presents a certain delamination where the airflow near the top and bottom walls has lower velocity than that passing through the mid-chamber and the airflow distribution in each layer is stable without obvious vortex. Each grain component has respective particle trajectory which is significantly different. This indicates that effective separation on each grain component could be achieved in the developed cross-flow air separation unit.