【摘要】 为探究颗粒模型缩放及输送机结构尺寸缩放对仿真结果的影响,应用相似理论和量纲分析法针对水平螺旋输送机的输送过程离散元仿真进行分析。通过维持充填系数不变来确保不同比例的仿真系统具有相同的输送特性,并从缩放前后系统重力系数不变的条件出发,研究各参数的缩放比例关系。在此基础上按照量纲分析结果进行参数设置,完成多组不同系统缩放比例的EDEM仿真。仿真结果分析发现:各组缩放比例下的水平螺旋输送系统的输送特性均能保持一致;各组仿真的轴向输送速度、流量缩放比例与量纲分析结果一致,误差较小;仿真的时间尺度只受设备模型的缩放比例影响,不受颗粒模型缩放比例影响,在缩放后的系统中测量反映原系统某时刻具体参数的数值,需要考虑时间尺度对缩放的影响。更多还原

【Abstract】 In order to study the influence of particle model scaling and conveyor structure scaling on the simulation results, the discrete element simulation analysis of the conveying process of horizontal screw conveyor was carried out by using similarity theory and dimensional analysis method. Keep the filling coefficient constant, so as to ensure that the simulation systems with different scales have the same transportation characteristics. According to the assumption that the gravity coefficient of the system is unchanged before and after scaling, the scaling relationship of each parameter was studied. On this basis, the parameters are set according to the dimensional analysis results, and the EDEM simulation with multiple groups of different system scales was completed. The simulation results showed that the conveying characteristics of the horizontal spiral conveying system can keep the same under each group of scaling ratios; The simulated axial conveying speed and flow scaling ratio of each group were consistent with the dimensional analysis results, and the error was small The time scale of simulation was only affected by the scaling of equipment model, not by the scaling of particle model. The measurement results in the scaled system showed that the specific parameters of the original system at a certain time are affected by the scaling of time scale.更多还原