The airflow cylinder sieve directly affects the harvesting effect as one of the main components of the rice combine harvester. The process of grain separated from threshed rice mixture is a multi-physical random pattern. This paper constructed accurately the components particle models, and reproduced the screening process of mixture via CFD-DEM (Computational Fluid Dynamics and Discrete Element Method). Objectives of this work are to better understand the impact of airflow velocity, aperture and deflectors of cylinder sieve on separation effect of the mixture in an airflow cylinder sieve device. The optimal working parameters of sieve were developed by the OED (Orthogonal Experiment Design) and the weight of the index method. The simulations result show that airflow velocity and aperture have an impact on the loss ratio and efficiency; deflectors have implications on efficiency. It is beneficial for separation of grain from the mixture with the airflow velocity, the aperture and deflectors are of 11m/s, 11mm, and two turns, correspondingly. The experiments result carried out on the test bench with real threshed rice mixture and agree with simulations, which proved the feasibility of the results. This paper provided basic data for the design of screening unite of rice harvester’s equipment.

作为大米联合收割机的主要组成部分之一，气流圆筒筛直接影响收割效果。从脱粒的大米混合物中分离出谷物的过程是多物理随机模式。本文准确地建立了组分颗粒模型，并通过CFD-DEM（计算流体动力学和离散元方法）再现了混合物的筛选过程。这项工作的目的是更好地了解气流速度，孔径和圆筒筛的偏转器对气流圆筒筛设备中混合物分离效果的影响。通过OED（正交实验设计）确定了筛子的最佳工作参数。）和权重指数法。仿真结果表明，气流速度和孔径对损耗比和效率有影响。导流板会影响效率。以气流速度从混合物中分离出谷物是有利的，孔径和偏转器分别为11m / s，11mm和两圈。实验结果是在实际的脱粒大米混合物的试验台上进行的，与模拟结果吻合，证明了该结果的可行性。本文为水稻收割机设备筛选装置的设计提供了基础数据。