摘要：堆积角实验可用于煤散料的离散元微观参数优化, 为煤散料的准确仿真分析奠定基础。对3种不同粒径的煤散料进行堆积角实验, 采用图像处理技术获取煤散料堆积角, 研究颗粒尺寸对堆积角的影响;采用离散元法建立不同的煤散料模型, 通过堆积过程的仿真分析, 研究煤散料模型的复杂程度对仿真准确性的影响;在此基础上研究落料高度对堆积角的影响。结果表明:随着颗粒尺寸变大, 堆积角也相应增加;接近真实颗粒形状建立的离散元模型能得到更好的仿真效果;随着落料高度的增加, 堆积角呈线性减小的趋势。

关键词：离散元法；堆积角；煤散料；落料高度；图像处理

Abstract：The repose angle test of coal bulk could be used for optimization of the discrete element method (DEM) parameters, laying the foundation for accurate simulation analysis. Three coal particle sizes were chosen to study the influence by particle size on the repose angle using the repose angle test and image processing technology. The research established different models of bulk coal to analyze the influence of the DEM model accuracy on simulation results. Based on this, the effect of falling height on the repose angle was studied. Results show that the repose angle increases as the particle size increases. And better simulation results can be achieved by using the particle model similar to the real bulk coal.Besides, the repose angle decreases linearly as the falling height increases.

Keywords：discrete element method；repose angle；bulk coal；falling height；image processing