玉米颗粒堆积特性的离散元法模拟研究

Discrete Element Method Simulation of Corn Grain Stacking Characteristics

为探究玉米颗粒形状与颗粒湿度(颗粒中水的质量分数为14.23%)对颗粒堆积形态的影响,课题组利用离散元法(discrete element method,DEM)对玉米颗粒进行了颗粒堆积模拟。采用3种不同的颗粒模型(球形、楔形和3D扫描),设置2种不同干燥度的颗粒物料群来模拟颗粒堆积。结果表明:在颗粒干燥的情况下,球形颗粒的堆积角最小,楔形颗粒与3D扫描颗粒的堆积角差别较小;颗粒在一定湿度情况下,楔形颗粒的堆积角最大,其次是球形颗粒和3D扫描颗粒。颗粒形状对颗粒堆积形态的影响要小于颗粒湿度对颗粒堆积形态的影响。

To explore the influence of corn grain shape and particle humidity(with the moisture content of 14.23%)on particle packing morphology,the DEM-Discrete Element Method was used to simulate the corn grain stacking.Three different particle models(spherical,wedge and 3D scanning)were used to simulate particle packing by setting two kinds of granular material groups with different dryness.The results show that when the particles are dry,the pile angle of the spherical particles is the smallest,and the difference between the wedge-shaped particles and the 3D scanning particles is small;under certain humidity,the pile angle of the wedge-shaped particles is the largest,followed by the spherical particles and the 3D scanning particles;The effect of particle shape on particle packing morphology is less than that of particle humidity on particle packing morphology.