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

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.