筒仓装卸料时力场及流场的离散单元法模拟

利用离散单元法研究了筒仓装卸料过程中的力场和速度场,以期揭示宏观力学行为的内在机理。首先介绍了离散单元法的基本原理,然后用物理模型实验测试和模拟了筒仓壁法向压力及物料流动过程,最后用离散单元法研究了筒仓内部压力和物料颗粒速度场,并探讨了颗粒密度和物料密实度的影响。与物理实验结果对比表明,离散单元法用于模拟和分析筒仓壁压力及物料流动规律等是完全可行的

Discrete Element Method Simulation of Forces and Flow Fields During Filling and Discharging Materials in Silos

In order to reveal the inherent mechanism of macromechanical behaviour in silos, the discrete element method was used to study the internal contact forces and flow fields during filling and discharging materials. First, the fundamentals of discrete element method were introduced in this paper. Second, a series of physical experirnents were conducted to test the normal forces acting on silo walls and visualize the whole flow patterns during discharge. Finally, with the particle density and bulk packing density considered, the internal forces and velocity fields of particles in silos were simulated using the discrete element method. It was shown that the wall normal forces as well as the flow patterns simulated with the numerical model are in good agreement with the experimental results. So the discrete element method can be used as an auxiliary tool in the analysis of silo flow and design.