平面湍流射流细颗粒物团聚的PBM-LES耦合模拟  

PBM-LES Coupled Simulation of Fine Particle Aggregation in a Plane Turbulent Jet

作　　者：李佳[1] 陈占秀[1] 杨历[1] 李阳[1] 

机构地区：[1]河北工业大学能源与环境工程学院,天津300401

出　　处：《热能动力工程》2017年第7期64-72,共9页Journal of Engineering for Thermal Energy and Power

基　　金：中低温热能高效利用教育部重点实验室(天津大学)项目(201503-404);河北省高等学校科学技术研究项目(ZD2015128;ZD2016163)

摘　　要：本文选取平面湍流射流为研究对象,通过大涡模拟与颗粒群体平衡模型耦合模拟了亚微米级细颗粒物在平面湍流射流流场中的团聚情况,分析了细颗粒物在流场中的运动情况以及粒径的演变过程,研究了不同时间、不同入口体积分数以及不同St数对细颗粒物团聚的影响。结果表明,在射流发展过程中细颗粒物粒径经历了逐渐增大且数密度逐渐减小并趋于稳定的过程;入口体积分数增大加强了流体与颗粒相之间相互作用的程度,细颗粒物的团聚效果更加显著;St数增大影响了细颗粒物在流场中的运动情况,削弱了细颗粒物的团聚效果。The agglomeration of fine particles in a plane turbulent jet flow field was simulated by large eddy simulation and particle population balance model. The movement of fine particles in the flow field and the evolution of the particle size were analyzed,and the effects of different time,different volume fraction and different St numbers on the aggregation of fine particles were studied. Results showed that the fine particle in the plane turbulent flow field has experienced the process of gradual increase in diameter and decrease in number density. With the increase in inlet volume fraction,the degree of interaction between the fluid and the particle phase is enhanced,and the agglomeration of fine particles is more significant. The increase of St number affects the movement of fine particles in the flow field,and the aggregation of fine particles is weakened.

关 键 词：PM2.5 大涡模拟 颗粒群体平衡模型 自由分子凝并核 平面湍流射流 

分 类 号：V235.11[航空宇航科学与技术—航空宇航推进理论与工程]