Abstract: Guide vane is the important part in the classification zone of classifier，a L-shape guide vane with groove facing the rotor is designed，and the classification zone composed of guide vanes and rotor is taken as the air-solid two-phase turbulent theoretical model. Reynolds Stress Model (RSM) and Eulerian- Lagrangian Particle Trace Model are used to do numerical simulation. The results show that the L-shape guide vane can achieve rapid classification，and reduce particle agglomeration. Influenced by greater centrifugal force，coarse particles are thrown to the lee side of the guide vane and lose their momentum，then drop to the grit funnel rapidly by gravity force，greatly avoiding particle back mixing generally observed in traditional flat guide vane，and reducing the interference of the following particles by coarse particles already classified，thus assuring the stabilization of classification process. According to numerical simulation and experience，the installing radial obliquity of L-shape guide vane of 55º is appropriate. The experiment results indicate that L-shape guide vane is helpful to improving classification precision and efficiency.

摘要： 导流叶片是涡流分级机分级区的重要部件，本文设计了一种其凹槽面向转子的“L”形导流叶片，并以该叶片与转子组成的分级区域为气-固两相湍流理论模型，采用RSM应力方程模型和随机颗粒轨道模型进行了数值模拟。结果表明：“L”形导流叶片能实现迅速分级，减少颗粒在分级区的团聚；粗颗粒受到较大的离心力被抛向导流叶片凹槽内碰到导流叶片背风面失去动量后由于受到气流干扰很小，在自身重力作用下迅速下掉入粗粉斗，很大程度上避免了传统平板导流叶片易产生的颗粒返混现象，减少了已分级的粗颗粒对后续待分级颗粒的干扰，使分级过程更加稳定。根据数值模拟结果结合经验，“L”形导流叶片安装时的径向倾角取55°为宜。试验结果表明，使用该“L”形导流叶片有利于提高分级效率和分级精度。