基于离散元法的煤散料堆积角试验研究
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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。
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.
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.
引文
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[16] EDEM. EDEM user guide[M]. Edinburgh:DEM Solutions,2014.
[2]何芳,白焰,张然.球磨机运动动能与存煤量的DEM试验研究[J].动力工程学报,2014,34(8):639-645.
[3]李博,王学文,陈祖向,等.煤散料输运状态模拟研究[J].煤炭技术,2018,37(2):251-253.
[4] MAK J,CHEN Y,SADEK M A. Determining parameters of a discrete element model for soiltool interaction[J]. Soil&Tillage Research,2012,118(5):117-122.
[5] UCGUL M,FIELKE J M,SAUNDERS C. Three-dimensional discrete element modelling of tillage:determination of a suitable contact model and parameters for a cohesionless soil[J]. Biosystems Engineering,2014,121(2):105-117.
[6] COETZEE C J,ELS D N J. Calibration of discrete element parameters and the modelling of silo discharge and bucket filling[J]. Computers&Electronics in Agriculture,2009,65(2):198-212.
[7] GONZ LEZ-MONTELLANO C,FUENTES J M,AYUGA-T LLEZ E,et al. Determination of the mechanical properties of maize grains and olives required for use in DEM simulations[J]. Journal of Food Engineering,2012,111(4):553-562.
[8]国家机械工业局.连续输送设备散粒物料堆积角的测定:JB/T9014.7-1999[S].北京:机械科学研究院出版社,1999.
[9] SANTOS K G,CAMPOS A V P,OLIVEIRA O S,et al. DEM simulations of dynamic angle of repose of acerola residue:a parametric study using a response surface technique[J]. Blucher Chemical Engineering Proceedings,2015,1(2):11326-11333.
[10]王云霞,梁志杰,张东兴,等.基于离散元的玉米种子颗粒模型种间接触参数标定[J].农业工程学报,2016,32(22):36-42.
[11]韩燕龙,贾富国,唐玉荣,等.颗粒滚动摩擦系数对堆积特性的影响[J].物理学报,2014,63(17):165-171.
[12] ILELEJI K E,ZHOU B. The angle of repose of bulk corn stover particles[J]. Powder Technology,2008,187(2):110-118.
[13] HERTZ B H. On the contact of elastic solids[J]. J Reine und Angewandte Mathematik,1882,92:156-171.
[14] MINDLIN R D. Compliance of elastic bodies in contact[J]. J Appl Mech,1949,16(3):259-268.
[15]蔡柳,王学文,王淑平,等.煤散料在刮板输送机中部槽中的运动分布特征与作用力特性[J].煤炭学报,2016,41(增刊1):247-252.
[16] EDEM. EDEM user guide[M]. Edinburgh:DEM Solutions,2014.