复合激励下有限边界域内散状物料高效定向流动机理研究

颗粒运动机制研究是近20年科学前沿之一。大型平底筒仓构成的有限边界域内，可升降自公转开式螺旋通过复合运动激励散料颗粒形成稳定、可控、高效的定向流场，属于目前急需解决的科学与应用问题。针对复合激励作用下受有限约束散料的高效定向流场形成机理、条件及其稳定性，提出“力链网络动态重构+极限平衡动态重建+能量有限耗散”的研究路径，建立由代表性体积单元RVE本构模型、基于连接尺度方法BSM的Cosserat+DEM多尺度耦合模型构成的复合模型，从细观和宏观层面分析定向流场中力链网络和极限平衡状态的破坏与重构，得到定向流场的动态稳定条件；采用EB-GAN生成式对抗网络模型分析散料能量有限耗散区域特性、稀疏响应分析研究定向流场简化数值模型、特征数据靶向生成方法获取宏观层面颗粒流动规律、EDEM+FLUENT进行仿真实验，研究得到散料高效定向流动机理，并由此提出开式螺旋输送系统高效定向输送理论。

The study of particle motion mechanism is one of the scientific frontiers in the past 20 years. In the limited boundary region composed of large-scale flat bottom silos, stable, controllable and efficient directional flow field is formed by the lifting rotation and revolution open-ended screw through the compound movement of the bulk materials, which is an urgent scientific and application problem. In view of the formation mechanism, condition and stability of the highly efficient directional flow field of the limited restricted bulk materials under the action of composite excitation, the research path of "dynamic reconstruction of force chain network + dynamic reconstruction of limit equilibrium + finite dissipation of energy" is proposed, and the composite model composed of the representative volume element RVE constitutive model and the Cosserat + DEM multi-scale coupling model based on BSM is established, the damage and reconstruction of the force chain network and the limit equilibrium state in the directional flow field are analyzed in the micro and macro level, and the dynamic stability conditions of the directional flow field are obtained. The EB-GAN generated countermeasure network model is used to analyze the regional characteristics of the limited dissipation of bulk energy, the sparse response analysis is used to study the simplified numerical model of the directional flow field, and the target generation method of the characteristic data is used to obtain the particle flow law in the macro level and EDEM + Fluent carried out simulation experiments to study the mechanism of efficient directional flow of bulk material, and put forward the theory of efficient directional transportation of open-ended screw conveying system.