加料速度对分级机内部流场的影响.pdfVIP

第66 卷 第S1 期 化 工 学 报 Vol.66 No.S1 May 2015 2015 年5 月 CIESC Journal ·159 · 加料速度对分级机内部流场的影响 党栋，王克俭 （北京化工大学机电工程学院，北京 100029 ） 摘要：用Fluent 软件模拟仿真分析了FTW 型涡轮空气分级机内部流场的动态压力、湍动能、流动速度的分布， 对比分析不同加料速度对分级机内部流场的影响。结果表明：加料速度增加，动态压力降低，但分布曲线的对称 性更好；湍动能降低，但分布更为均匀；径向速度增加，切向速度和轴向速度都降低，且分布更为均匀，其中 轴向速度较大，对流场影响更大；有利于流场稳定，更有利于物料分级。实验测试了分级粒径分布部分支持这 些效果。 关键词：涡轮空气分级机；加料速度；流场分析；优化；数值模拟 DOI ：10.11949/j.issn.0438-1157 中图分类号：TQ 174.6 文献标志码：A 文章编号：0438—1157 （2015 ）S1—0159—06 Effect of feeding rate on flow field inside classifier DANG Dong,WANG Kejian (School of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China) Abstract ：The flow field in FTW turbine classifier is studied by using simulation of the dynamic pressure, the turbulent kinetic energy, velocities using computational fluid dynamics software Fluent. Effects of feeding rate on the inner flow field were compared and analyzed. The results showed that when the feeding rate increases, the dynamic pressure is reduced while its distribution is symmetrical. The turbulent kinetic energy is reduced with more uniform distribution and increased radial velocity, decreased tangential velocity and decreased axial velocity. The greater impact on the flow field is the larger axial velocity favorable for stable classifying. Experimental measurement of particle size distribution verified some of the above results. Key words ：turbine classifier ；feeding rate ；flow field analysis；optimization ；numerical simulation 引 言