摘要
采用RNGκ-ε模型、随机颗粒轨道模型对扩散式气固分离器内的两相流动情况进行了数值模拟研究,讨论了流速对分离效率的影响,颗粒分级分离效率,颗粒轨迹,以及多个几何结构尺寸对分离效率和阻力系数的作用情况。数值模拟结果表明该类分离器流场总体成双层流动结构,分离器对4μm以下的小颗粒分离效率较低,流速对分离效率的作用比较明显,各结构尺寸对阻力系数和分离效率的影响比较复杂,结构尺寸的取值有一定比例范围。
RNG κ-ε model and DPM model are used to simulate the two-please now in a diffusible gas-solid separator. The trajectories of different diameter particles under the same inlet-velocity, the relationship of separate efficiency with various gas inlet-velocity are obtained. At last we discussed the effect geometric sizes acting on the separate efficiency and pressure loss. The results show that the flow field structure is two-layer; radial velocity is smaller than axial and tangential velocity especially in the reflecting cone; and the efficiency is low when particle diameter is less than 4 μm; Inlet-velocity has strong action on the separate efficiency. The effect geometric sizes acting on the separate efficiency and pressure loss is very complex, and the value of geometric sizes has a reasonable scope.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2007年第1期74-76,共3页
Journal of Engineering Thermophysics
基金
浙江省教育厅基金重点项目资助(No.G20050670)
关键词
扩散式气固分离器
两相流动
数值模拟
阻力
分离效率
diffusible gas-solid separator
two-phase flow
numerical simulation
loss
separate efficiency
