摘要
在欧拉-拉格朗日坐标系中,采用混合网格,对入口下倾旋风分离器内的气固两相非稳态流动特性进行了数值模拟,其中,对气相部分采用了雷诺应力湍流模型,对颗粒使用离散相模型来模拟,颗粒分布采用Rosin-Rammler模型,并用随机轨道模型和涡生存时间模型来模拟颗粒的扩散效应,同时引入了Tabakoff壁面反弹恢复系数以获得更加精确的除尘效率.仿真结果表明,螺旋下倾入口结构能有效减轻旋流除尘器内气体自身的压缩现象,消除上灰环,起到良好的节能增效作用.
The unsteady characteristics of gas-solid flow in a ramped entrance cyclone separator was numerically studied by using hybrid grids methods in the Euler-Lagrange coordinate system.The Reynolds stress turbulence model（RSM）was used to calculate gas flow,the discrete phase model（DPM）was used to simulate particle flow,and the Rosin-Rammler model was used to calculate particle size distribution.During numerical simulation,the effect of particle diffusion was studied by using the stochastic trajectory model combined with the random eddy lifetime model,and the wall reflection coefficient which was defined by Tabakoff polynomial profile was also introduced to calculate collection efficiency.The results show that,compared with the traditional cyclone structure,the ramped entrance structure cyclone can reduce self-compression of gas flow and get rid of ring existing in the roof of cyclone,hence reducing inner wall abrasion,reducing pressure-drop in cyclone and then increasing separation efficiency.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2010年第6期531-536,共6页
Journal of Combustion Science and Technology
基金
福建省教育厅科技计划重点资助项目(JA08151)
厦门市科技计划重点资助项目(3502Z20080003)
福建省科技创新平台资助项目(2009H2006)
集美大学创新团队基金资助项目(2009A002)
关键词
入口下倾旋风分离器
数值模拟
雷诺应力模型
随机轨道模型
混合网格
ramped entrance cyclone separator
numerical simulation
Reynolds stress model
stochastic trajectory Keywords：model
hybrid grids
