摘要
运用CFD数值计算方法,在不同入口高宽比下,通过雷诺应力模型对分离器速度场进行研究,在拉格朗日坐标系下对粒子轨迹进行追踪,并对壁面磨损进行了对比分析。结果表明:分离空间切向速度峰值和中心区域的速度波动都与高宽比成正比,过大的高宽比也会加剧涡核摆动强度,加剧锥体底部的冲蚀磨损。中间粒径颗粒的入射位置对顶灰环的形成有一定影响,靠近入口下方入射时,颗粒更容易进入灰斗,而在入口上部入射时,容易在分离空间顶端聚集,加重顶部区域的磨损。在磨损方面,筒体部分的冲蚀速率都是从分离空间顶端向下渐渐变小,且随着高宽比的增大最大冲蚀速率逐渐变大。锥体壁面的冲蚀磨损速率沿着轴向向下都出现逐渐增大的趋势。因此,为了兼顾较小的壁面磨损和更好的工艺性能,因选择合适的高宽比。
Under different inlet aspect ratio,the velocity field of separator had been researched,particle＇s trajectory had been tracked in Lagrangian coordinates,and the wall erosion rate was analyzed in comparison,using the CFD numerical simulation method.It was found that the separation of the central region of space and tangential velocity peak velocity fluctuation were proportional to the ratio,and large aspect ratio will exacerbate the intensity of vortex core oscillation,which will increase the erosion wear at the bottom of the cone.The middle size particles in the incident location had a certain influence on the formation of a grey ring,the one which was near the entrance to the below incident will been tracked easily by the hopper,the one which was in the entrance to the upper of the incident will form a grey ring gathered at the top,adding the erosion rate of the top area.In terms of wear and tear,the erosion rate of cylinder parts became smaller from top to down gradually,and the maximum erosion rate increased along with the aspect ratio.Cone wall erosion wear rate increased from the top to down along the axial.Therefore,in order to keep the balance between smaller wall wear and the better process performance,the appropriate ratio should been taken into consideration.
出处
《流体机械》
CSCD
北大核心
2017年第7期52-57,11,共7页
Fluid Machinery
关键词
旋风分离器
气-固两相流
冲蚀磨损
高宽比
颗粒运动
cyclone separator
gas and solid two-phase flow
erosion wear
aspect ratio
motion of particles
