摘要：在分析传统下锥体和新型下锥体的结构与进风方式差别的基础上,采用Fluent软件进行流体动力学分析,考察2种结构出口环面的z向速度分布及内部气流运动规律。结果表明:新型下锥体采用环状全断面进风,使得出口环面上z向速度更加均匀;蜗壳及导风叶片的作用使新型下锥体内部气流形成涡旋,气流布满出口环面,克服了传统下锥体速度不均匀和分选盲区的弊端;新型下锥体具有较高的再次分选能力,验证了模拟结果的可靠性,为分级机进风结构的改进提供了优化方案。

关键词：分级机；新型下锥体；三次风；速度分布

Abstract: On the basis of analysis on difference of structures and inlet way of traditional and new cones， the velocity distribution in direction z of the export torus and the internal flow field motion rules of the 2 devices are investigated using Fluent software to carry on fluid dynamics analysis. The results show that the new cone uses circular full face ventilation， so the speed in direction z of the export torus is evener. The internal flow of new cone forms vortex and the air fills full of export torus， because of the effect of the spiral case and guide blades. The uneven export wind speed and the disadvantages of blind separation of the traditional cone are overcome. The new cone has a higher level of second classification. The reliability of simulation results is verified which provide a optimization scheme of the improvement of the classifier wind inlet structure. 

Keywords: classifier；new lower cone；the third wind；velocity distribution.