离散元（DEM）仿真技术在料仓散料流的研究进展

散料是介于流体与固体之间的介质，不同物料表现出的性质不同，其运动机理非常复杂。利用离散元仿真技术可以对散料流颗粒运动的微观机理进行分析和了解。文章就离散元技术的发展过程及原理进行阐述。仿真模拟的准确性其根本是在于力学模型建立的准确性，介绍目前离散元法常用的几种力学模型以及利用DEM仿真技术对料仓中散料流运动机理研究的进展，包括其流动形式，速度和接触力的分布，以及散料物性参数的影响。这些研究对实际工程，例如火电行业的煤仓、灰渣仓及石灰石仓等料仓的应用有着重要的指导意义。

Study on Granular Flow in Hoppers Using DEM Simulation

Granules are mediums between liquids and solids. Different granules exhibit different characteristics with complex kinetic mechanisms. Fortunately, the microscopic dynamics of granule flow can be simulated using discrete element method(DEM). In this paper, the theory and development of DEM technique are presented. Moreover, the accuracy of computer simulation depends on how accurate the mechanical model is established. The typical mechanics models used in DEM technique as well as the kinetic studies of granular flow in hopper using DEM technique are illustrated, including the flow behaviour, the distribution of velocities and contact forces and the influences of particle properties. The study results are of the great importance for the practical applications of hopper storing practices, such as coal bins, ash bins and limestone hoppers.