两种不同入口形式的旋风分离器分离性能的对比研究

Contrast Studies on Cyclone Performances With Two Different Inlet Types

采用数值模拟和实验研究的方法比较了不同进气量下,相同入口面积的Stairmand型和轴流导叶式旋风分离器的压降、分离效率和内部流场。结果表明,进气量648m^3/h时,轴流导叶式分离器内切向速度小于Stairmand分离器,进气量1080m^3/h时,轴流导叶式分离器切向速度较大;本实验条件下,轴流导叶式分离器可以明显增加内部流场的对称性和稳定性,削弱环形空间纵向环流和短路流现象;Stairmand型分离器分离效率随进气量先增大后减小,轴流导叶式分离器的效率则一直增加,且进气量小于1080 m^3/h时,Stairmand型分离器分离效率较高,进气量大于1080m^3/h时,轴流导叶式分离器分离效率较高;相同进气量下,轴流导叶式分离器压降基本小于Stairmand型分离器。

In this paper,pressure drop,collection efficiency and flow field of Stairmand type and axial guide vane cyclone separators with the same cross-area were studied numerically and experimentally.The results showed that with the flow rate of 648 m^3/h,the tangential velocity in the axial guide vane type cyclone was higher than that in the Stairmand type cyclone.While with the flow rate of 1080 m^3/h,the tangential velocity showed an opposite result. Under the experimental conditions,the symmetry and stability of the flow field were improved obviously in the axial guide vane cyclone separator,as well as the secondary flow and short circuit flow.The collection efficiency of the Stairmand type cyclone increased firstly and then decreased along with the flow rate. However,the collection efficiency of the guide vane type cyclone increased consistently with the flow rate.Furthermore,the collection efficiency of the Stairmand type cyclone was higher than that of the guide vane cyclone as the flow rate less than 900 m^3/h.With the flow rate higher than 900 m^3/h,the collection efficiency of the guide vane cyclone was higher than that of the Stairmand type cyclone.In addition,the pressure drop of the guide vane cyclone was generally smaller than that of the Stairmand type cyclone.