关键词: 被动供油, 多孔介质, 冷压, 数值模拟, 渗透率

Abstract: The main goal of the bearing lubrication replenishment system is to achieve longterm, stable, and minimal lubricant supply to the flywheel bearing. The complex structure of the microporous medium may be effective to achieve this goal, but the current seepage mechanism and law are not yet clear. The main problems are that the porous media structure is difficult to control, the relationship between the porous structure and permeability is complex, and the permeability is affected by assembly pressure. The valve is generally made in two steps: first cold pressing the particulate matter, and then sintering the structure obtained by cold pressing to obtain the finished product. The current production process is mainly based on experience. The mechanism is unclear, and it is difficult to accurately control. In this paper, the Discrete Element Method and Lattice Boltzmann Method are combined numerically to study the permeability change of the particle packing structure during the cold pressing process. The Discrete Element Method is used to simulate the cold pressing process of the particle accumulation structure, and then the Lattice Boltzmann Method is used to simulate the seepage flow. The permeability change of the cold pressed structure under different friction angles is obtained. This study lays the foundation for a comprehensive disclosure of the relationship between the cold pressed structure of porous media and permeability and its microscopic mechanism.