粉尘粒子运动扩散特性的大涡模拟研究  

Large eddy simulation of the dispersion of dust particles in air

作　　者：于明州[1] 金晗辉[1] 陈丽华[1] 樊建人[2] 岑可法[2] 

机构地区：[1]浙江大学机械与能源工程学院,杭州310027 [2]浙江大学洁净能源利用国家重点实验室,杭州310027

出　　处：《环境科学学报》2005年第7期891-895,共5页Acta Scientiae Circumstantiae

基　　金：浙江省自然科学基金项目(No.J20040028)~~

摘　　要：采用大涡模拟的方法(LES)模拟了气体运动,采用Lagrangian方法模拟了粉尘颗粒运动,针对平面尾迹流和湍流射流这2种基本流场类型对不同stokes(St)数粉尘颗粒随流场的空间分布特性进行了数值模拟.2种不同工况下的数值模拟结果均显示,小Stokes数颗粒在流场中受流体涡团的影响较大,一般分布于涡团核心区,并且小Stokes数颗粒可以和流场近似无滑移的同步发展;中等Stokes数颗粒由于受来流涡结构离心力与颗粒自身惯性力的影响大致相同,一般分布于涡核的边沿;而Stokes数远大于1的大颗粒,由于其在流场中跟随性减弱,更多的颗粒按其原有的方向运动,表现的是自身运动惯性的影响.Large eddy simulation (LES) was adopted to simulate gas phase flow, and Lagrangian approach was utilized to simulate the motion of the dust particle to find out the real characters of the dispersion of dust particles in air. The flow fields simulated here were two-dimensional gas-particle two phases wake flow and two-dimensional gas-particle two phases jet. After a thorough analysis of the properties of flow fields, a series of significant and interesting results were obtained. Dust particles of mediate Stokes number mainly concentrated in the outer boundary region of large scale eddy, and they had the highest dispersion rate; dust particles of little Stokes number mainly lay in the core region of the eddy; though dust particles of large Stokes number distributed throughout the eddy structures.

关 键 词：大涡模拟 大气尘 扩散 

分 类 号：X513[环境科学与工程—环境工程]