中文摘要：

应用Fluent软件建立传统涡流空气分级机三维模型并对其内部流场进行数值模拟，同时采用激光多普勒测速仪对分级机内流场进行测量。研究表明：当进口风速一定时，存在一个临界转笼转速使得环形区及转笼叶片间流场分布最均匀，分级性能好。改进转笼结构并进行模拟分析，新结构转笼的叶片设计成流线型，减少了气流与叶片的碰撞。模拟结果表明：与传统涡流空气分级机相比．环形区内速度分布得到了改善，新结构转笼叶片间旋涡趋势减弱，分级机内分级力场优于传统转笼。特别是转笼高速旋转时，结构改进效果更加屈著。

英文摘要：

A three-dimensional model of turbo air classifier was established and its interior flow field was simulated by the software of Fluent. The flow field in between the blades of rotor cage was measured by laser Doppler velocimeter （LDV）. The result indicates that when the inlet velocity settles, there must be a critical rotary speed to make the flow field in the annular region and in between the blades be symmetrical, resulting in an excellent classification performance. On the basis of improvement on the structure of rotor cage and the simulation analyses, the blades of new-structure rotor cage are in streamline design and this design is able to avoid the collision of blades and air flow. The simulation results indicate that comparing with a conventional classifier, air flow in the annular region is optimized and the vortex intensity in between blades classification force field in classifier is excelled especially when of new-structure rotor cage is decreased, and the the rotary speed is high.