摘要：利用计算流体动力学软件,分别采用k-ε模型、大涡模拟模型、离散相模型模拟凝聚器扰流区流场时均参数、流场瞬时参数与颗粒运动轨迹。结果表明,扰流柱具有很好的扰流效果,可以使不同粒径颗粒的运动轨迹发生明显的交叉现象,增大颗粒碰撞概率;流速越大,扰流区阻力越大;流场中存在明显的涡街脱落现象,各扰流柱主要能量涡街的脱落频率相同,Strouhal数约为0.22。

关键词：凝聚器；细颗粒物(PM_2.5)；计算流体动力学；Strouhal数

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