文献类型：期刊文献

中文题名：径向入口结构的旋风分离器内三维流场的数值研究

英文题名：Numerical Simulation of Three-Dimension Flow Field in a New-Type Cyclone Separator with a Radial Inlet Structure

作者：崔洁[1];陈雪莉[1];龚欣[1];王辅臣[1]

机构：[1]华东理工大学煤气化教育部重点实验室,上海200237

年份：2010

卷号：24

期号：3

起止页码：388

中文期刊名：高校化学工程学报

外文期刊名：Journal of Chemical Engineering of Chinese Universities

收录：CSTPCD;;EI(收录号：20102713051807);Scopus;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：国家高新技术研究发展计划项目(863计划)(2006AA05A101);(2007AA050301)

语种：中文

中文关键词：旋风分离器;数值模拟;RSM;涡核

外文关键词：cyclone separator; numerical simulation; RSM; vortex core

摘要：采用雷诺应力模型(RSM)对径向入口结构的旋风分离器内气相流场进行了数值模拟。不同于传统的切向入口结构,径向入口设计使得新型旋风分离器在保证较高分离效率的同时更能适应高压下的作业,且降低了工程焊接难度。通过模拟结果与实验值的对比发现,RSM模型能很好地预测新型旋风分离器内部气相流场,且模拟结果表明:旋风分离器内部流场呈现非轴对称性,主要表现为沿轴向气流的旋转中心与旋风分离器的几何中心不重合,且在分离空间内各轴截面出现具有周期性的摆动涡核。分离空间内切向速度场以0.8倍升气管直径为边界,呈现自由涡与强制涡结合的兰金涡形式,随着入口角度和升气管直径比(dr=dr/D)的减小,切向速度增大,内外旋流区也随之变化。此外,升气管内切向速度呈"U"形分布,由于速度分布中心不断发生变化,亦存在摆动涡核且摆动频率较分离空间的大。
Different from the traditional cyclones with tangential inlet pipe, the prepared new-type cyclone with radial inlet structure has the advantages of reducing the difficulty of welding work during preparation, being suitable for high pressure operation, and having higher separation efficiency. Based on the Reynolds stress model （RSM）, the gas-phase flow field in the new-type cyclone separator with radial inlet was numerically simulated, and the simulation results are in good agreement with the measured results, which shows that the RSM model can be used to well predict the gas flow in the new type cyclone separator. The results also indicate that the periodic oscillation of the vortex core exists in all axial sections of the separation space, and the inner gas flow field in the cyclone shows asymmetry which behaves that the spinning center of the gas flow deviates from the geometrical center of the cyclone. The tangential velocity profile can be described as a Rankine vortex, a combined free and forced vortex located at the position with the diameter of 0.8 dr （vortex finder diameter）. The tangential velocity increases with decreasing the inlet angle and the diameter ratio between the vortex finder and the cyclone （ dr = dr/D）, and the swirling flow regions also change. In addition, the tangential velocity profile in the vortex finder can be described as ＂U＂ type, and the swing frequency of the vortex core in the vortex finder is higher than that in the separation space.