摘要
利用FLUENT中的RSM模型和DPM模型对不同排气管底口半径r的缩口式旋风分离器进行了内部流场的数值模拟。对结果的时均图进行分析,得到随着收缩半径r的减小,排气管入口面积在减小,轴向速度及切向速度均增加,速度的增加可使靠近中心的颗粒获得更大的离心力,因此被捕集的颗粒数增多。当半径r与排气管半径R比值为1~0.9时,分离效率提高不大,压降变化也较小,比值为0.8~0.5时,分离效率提高很多,同时能量损失也较大,在半径r逐渐减小的过程中,旋风分离器分离效率增加,压降增加。综合考虑,当r/R为0.6~0.5左右时,分离效率约为97%~98%,此时压降也较合理。
The RSM model and DPM model are used to the numerical simulation of different exhaust pipe bottom opening radius reducing type cyclone separator for the internal flow field. The average of all results show that： As the radius decreases, the ex- haust pipe at the entrance area decreases, it makes axial velocity and tangential velocity increased. The increasing speed can make the center of the particles get larger centrifugal force, therefore the number of particles trapped increase. When the radius and the exhaust pipe radius ratio is 1 ~ 0.9, the separation efficiency and the pressure drop are improved a little. When the ratio is 0.8 - 0.5, the separation efficiency is improved a lot, and energy loss is larger. In the process of gradually decreasing radius, the separation efficiency and pressure drop increase. Comprehensive consideration, when r/R is about 0.6 - 0.5, the separation efficiency is about 97% -98% and the pressure drop is also reasonable.
出处
《流体机械》
CSCD
北大核心
2015年第12期28-32,共5页
Fluid Machinery
关键词
旋风分离器
数值模拟
排气管
缩口
分离效率
cyclone separator
numerical simulation
exhaust pipe
reducing radius
separation efficiency
