摘要
将直接模拟Monte Carlo(DSMC)方法应用于颗粒数目庞大的大规模气固两相撞击流的数值模拟研究,旨在解决基于拉格朗日法模型难以模拟含大量颗粒碰撞的多相流问题,建立了气固两相撞击流的数理模型。应用所建立模型计算分析了撞击流中的气相流动、颗粒运动、颗粒及颗粒碰撞位置分布;并对模型中考虑颗粒碰撞和不考虑颗粒碰撞时,计算获得的颗粒运动行为、停留时间以及对气相的影响等结果进行了对比分析。结果表明:经发展,DSMC方法能够有效地应用于大规模气固两相撞击流的数值研究;颗粒运动区域可分为颗粒碰撞区、颗粒射流区和颗粒发散区;颗粒碰撞主要发生在颗粒碰撞区内,使得颗粒在该区域富集,且明显缩短颗粒在撞击区的停留时间;在所研究的较小固气比条件下,颗粒的存在对气相流动的影响不显著。
The direct simulation Monte Carlo （DSMC） method based on Lagrangian approach was applied to large-scale gas-solid two-phase impinging streams with a large number of particles to solve the problem of calculating too many particle collisions with the particle trajectory model. A mathematical model for the gas-solid two-phase impinging streams was proposed. The gas flow field, particle distributions and collision positions were analyzed based on the calculation results. The particle motion behavior, particle residence time and the particle effect on gas flow by considering the particle collision were compared with those without considering the particle collision. The results indicated that the DSMC method can be effectively applied to the numerical study of large-scale gas-solid two-phase impinging streams. The particle distribution can be divided into three zones： particle-collision zone, particle-jetting zone and particlescattering zone. Particle collisions occurred mainly in the particle-collision zone causing enrichment of particles and decreased residence time of particles in the area. The particle effect on gas flow was not significant at a small particle to gas ratio of the present study.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2009年第8期1950-1958,共9页
CIESC Journal
基金
国家重点基础研究发展计划项目(2004CB217703)~~
关键词
DSMC方法
撞击流
气固两相流
颗粒碰撞
DSMC method
impinging streams
gas-solid two-phase flow
particle collision
