依据轴流式旋风分离器的基本结构建立分析模型，通过CFD-DEM耦合计算获得运行时内部流场主要参数以及颗粒分布，提取了影响分离性能的主要结构参数，研究其在不同粒径、不同进口速度下与分离效率和压降的关系，并给出了分离效率与各参数的拟合关系式。结果表明：叶片出口角和排气管直径对轴流式旋风分离器的分离效率有显著影响，随着叶片出口角减小，静压逐渐增大，切向速度增大，同时分离效率提高；排气管直径增大，静压减小，当其为分离器筒体直径的0.6~0.7倍时分离效果最好；流速为20 m/s时，对4 μm的颗粒分离效率可达到92.3%，10 μm及以上颗粒可实现100%分离；并使用加权方法给出了在粒径dp≥4 μm，进口风速为4~20 m/s的工况下适用的分离效率计算模型。

The analysis model was established according to the basic structure of the axial flow cyclone separator,the main parameters and particle distribution of the internal flow field during operation were obtained through the CFD-DEM coupling calculation,the main structural parameters affecting the separation performance were extracted,the relationships among them with the separation efficiency and pressure drop under different particle sizes and inlet velocities were studied,and the fitting equations of separation efficiency and various parameters were given.The results show that the blade outlet angle and exhaust pipe diameter have significant influence on the separation efficiency of the axial cyclone separator.With the decrease of blade outlet angle,the static pressure gradually increases,the tangential velocity increases,and the separation efficiency increases.With the increase of the diameter of the exhaust pipe,the static pressure decreases,so the separation effect is the best when it is 0.6 to 0.7 times of the diameter of the separator cylinder.When the flow rate is 20 m/s,the particle separation efficiency of 4 μm can reach 92.3%,and the particle separation efficiency of 10 μm and above can reach 100%.The calculation model of separation efficiency under the conditions of particle size dp of no less than 4 μm and inlet wind speed of 4 to 20 m/s is given by the weighting method.

TQ051.8

国家自然科学基金（2014MS107）；江西省自然科学基金重点项目(20171ACB21008)；江西省自然科学基金青年项目(20161BAB216112)