河南农业大学学报2017，Vol.51Issue(5)：687-692,6.
水平摆振下谷物偏析效果的离散元模拟研究
Discrete element simulation of grain segregation effect under horizontal pendulum oscillations
摘要
Abstract
For strengthening layering effect of thick-layer grain particles,a simulation study for segregation process of grains and short stalks when plain trough cylinder vibration body is under horizontal pendulum oscillations was carried out using the three-dimensional discrete element method.And the grain segregation mechanism was analyzed in detail based on the theory of gap filling,kinetic energy and momentum of the grain particles.By comparing different contacting times,kinetic energy and momentum of the particles in the segregation process of thin and thick material layer,we analyzed the reason of the poor layered effect of the thick material layer.The analysis results show that:under the action of periodic horizontal pendulum oscillations,the collision between particles change the gap of grain particles,which provides precondition for layering,and the collision and friction between particles and vibration body provide energy for layering.Because the energy and momentum of the short stalks is far less than the grains during the collision of the grains and short stalks,the short stalks are crowded to the upper space,and the grains are permeated to the gap of the lower part of the material layer,and then the layering is formed.Meanwhile,thick material layer is dense,and pressure and damping are bigger between bottom grains,which makes kinetic energy and momentum of vertical direction of the grains less than thin material layer,causing a poor layering effect.The particle volume fraction of the vibration body of adding cylindrical bump structurere is improved by 10％ compared to that of the light slot vibration body after improvement.关键词
水平摆振/谷物/偏析/离散元Key words
horizontal pendulum oscillations/grain/segregation/discrete element分类
矿业与冶金引用本文复制引用
马学东,李亚运,李玲玲,张艳兵,陈强..水平摆振下谷物偏析效果的离散元模拟研究[J].河南农业大学学报,2017,51(5):687-692,6.基金项目
辽宁省高校创新团队支持计划(TL2015014) （TL2015014）
