Abstract： Using the computational fluid dynamics software, the timeaverage flow field parameters, instantaneous parameters and particle trajectories were simulated by k-ε model, large-eddy simulation model and discrete phase model. The results indicate that the turbulence cylinder has remarkable turbulent effects, which can make the trajectories of particles with different sizes cross obviously and increase the collision probability between particles. The faster the velocity is, the greater the resistance of disturbed flow area is. There is obvious vortex shedding phenomenon in the flow field. The shedding frequency of main energy vortex for each turbulence cylinder is the same. The Strouhal number is approximately 0.22.

Keywords: coalescer； fine particulate matter(PM2.5); computational fluid dynamics; Strouhal number

中图分类号：X513         文献标志码：A

文章编号：1008-5548（2014）02-0051-05

DOI:10.13732/j.issn.1008-5548.2014.02.012

收稿日期：2013-09-05， 修回日期：2013-10-31，在线出版时间：2014-05-04。

基金项目：国家高技术研究发展计划（863 计划）项目，编号 2013AA065002。

第一作者简介：郦建国（1963—），男，高级工程师，研究方向为电除尘技术及电除尘设计。 E-mail: lijg1963@163.com。

通信作者简介：刘含笑（1987—），男，硕士，工程师，研究方向为电除尘新技术研发。 电话：18248606725， E-mail:gutounan@163.com。