宽筛分煤粉颗粒间相互作用的数值研究

NUMERICAL AIMULATION OF INTERACTIONS BETWEEN VARIOUS COAL PARTICLES

本文采用颗粒轨道模型，对不同直径的细小煤粉颗粒绕流单个球形大颗粒后的运动轨迹进行了数值模拟，研究了宽筛分条件下大颗粒的尾涡作用对小颗粒运动情况的影响．同时将计算结果同激光全息的实验结果进行了对照，二者符合得较好．结果表明，只有当煤粉颗粒的尺寸小到一定程度时，大颗粒的尾涡才对其运动轨迹产生显著影响．

For detailed study of particles' interaction in gas-solid two phase flow, a numericalsimulation work has been done by using PSIC (Particle Source in Cell) method to predictthe movement features of small coal particles with different diameters when they are passingthrough a large spherical particle. Also the influences of wakes behind the large particle onthe trajectories of small particles were studied. Meanwhile, the comparison with computationresults and laser holography experiment data shows good agreement. The result shows thatthe wake of the large sphere will influence the trajectories of little coal particles only if theyhave very small diameters.