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中文摘要：
基于离散元法（DEM）研究了筛面与物料特性在筛分过程中的协同作用，模拟了不同筛面长度的圆孔筛、方孔筛的筛分效率和复杂粒形物料在圆孔筛、方孔筛上的筛分效率。结果表明：在相同开孔率的前提下，筛面越长，筛分过程达到稳定状态所需的时间越长；圆孔筛和方孔筛的筛分效率均随筛面长度的增大而提高，且筛分效率与筛面长度之间关系符合Boltzmann方程；不同形状的颗粒分别在圆孔筛和方孔筛上筛分时，球形颗粒筛分效率最大，片状颗粒的筛分效率次之，胶囊形颗粒筛分效率最小；3种形状的颗粒在方孔筛上的筛分效率均明显高于在圆孔筛上的筛分效率。
英文摘要：
The cooperative effects of the screening surface and the material characteristics during screening process were studied based on discrete element method （DEM）, and the screening efficiency of the round-aperture screen and the square-aperture screen with various length of the screening surface was simulated. In addition, the screening efficiency of materials with complex particle shape on the round-aperture screen and on the square-aperture screen was also simulated. The results showed： the screening duration for screening operation to reach steady state prolonged with increase in the screening surface length at the same aperture ratio; the screening efficiency of the round-aperture screen and the square-aperture screen enhanced with increase in the screening surface length, and the relationship between the screening efficiency and the screening surface length conformed to Boltzmann equation; among materials with various shape, the screening efficiency of the spherical material was the highest, that of the flaky material was the second, and that of the capsule-shaped material was the lowest; the screening efficiency of the above three shape of material on the square-aperture screen was higher than that on the rotmd-aperture screen.
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