不同偏心距滚筒中大颗粒的平均速度脉动特性

Pulsation characteristics of larger particle average velocity in different eccentric rollers

采用离散元数值模拟法对多元颗粒在不同偏心距工况下进行数值模拟,研究偏心滚筒对全部大颗粒的运动初始阶段、稳定阶段的平均速度波动的影响。结果表明:在不同偏心距的偏心滚筒中,同粒径颗粒的平均速度波动不同;偏心滚筒中颗粒平均速度曲线在每个运动周期都会出现波峰和波谷现象,且偏心距越大,该现象越明显;在颗粒运动的初始阶段,大粒径颗粒平均速度波动范围大,偏心距为20 mm的滚筒中所有大颗粒平均速度波动范围最大;在颗粒运动的稳定阶段,随着时间的延长,粒径对于颗粒平均速度的影响不明显。

A numerical study on multiple particles under different eccentric conditions by DEM(Discrete element method)was presented.The aim is to research the influence of average speed fluctuation of larger particles by the eccentric rollers in initial and stable stages.The results show that the particles with the same size have different fluctuations of average velocity in different eccentric rollers;the average speed curves of particles in eccentric cylinder appear the peaks and troughs in a motion period,and greater eccentric rollers arise more obvious phenomenon.At the initial stage,bigger size particles have a wide range of average velocity fluctuation,the average speeds of all particles have the widest range in the 20 mm eccentricity drum.At the stable stage,the sizes of particles have no obvious impact on the average speed of particles when the particle movement gradually become stable.