中文摘要：

为了清楚地认识涡流空气分级机内部流场分布，文中利用Fluent软件建立分级机的三维模型，对其内部三维旋转流场进行了数值模拟计算，得出不同工况下分级机内部流场分布。采用激光多普勒测速仪（LDV）对转笼叶片间流场进行测量，应用测量结果来验证模拟计算结果，模拟结果与测量结果吻合。研究表明，在一定的进口风速下，当环形区靠近叶片处气流切向速度与转笼外缘切向速度相近时，存在一个临界转速使得叶片间流场最稳定，分级机分级效果最好。这为改进涡流空气分级机操作提供了理论指导。

英文摘要：

For clear cognition of the flow field distribution in a turbo air classifier , a 3-D model of the classifier was established by Fluent, the numerical simulation of the 3-D rotational flow field in the classifier was carried out, and the flow field distribution in classifier under different work conditions were gained. The measurements of the flow field between blades of the rotor cage were performed by laser Doppler velocimeter （LDV）. The results of measurement were used to validate the results of simulation and they are consistent. The study shows that under stated inlet velocity, when tangential velocity of the airflow in annular region nearing the blades is approximate to the tangential velocity of rotor cage extension, there is a critical rotor cage rotate speed which causes the flow field between blades of the rotor cage to be the most stable and the effect of classification to be the best. It provides theoretic reference to improve the manipulation of turbo air classifier.