关键词: 分级机, 进风口, 数值模拟

Abstract: Standard k-ε model in Fluent software was selected to simulate feeding tube inside airflow distribution in classifier，gas distribution at two different air inlets was obtained. Under the condition of contralateral air inlet，the airflow tended to hedge，extrude，flatten and steer process in the feeding tube of classifier，resulting in uneven distribution. Under the condition of ring surface air inlet，the airflow tended to the collect，disperse，and steer in feeding tube of classifier，resulting in a relatively uniform distribution，and the air flow classification can be improved Feeding speed，the system volume and classifier speed were fixed in this study. With the changing of inlets area and inlets wind speed，the influence of cutting grain size and the classification accuracy were obtained. The experimental results showed that with the area of inlets declining，grading size was basically unchanged，classification accuracy first increased，then decreased. Compare with the classification accuracy in classifier，the dispersion performance with ring surface air inlet was better than that with contralateral air inlet.

Key words: classifier, air inlet, numerical simulation