干旱地区农业研究2016，Vol.34Issue(6)：285-291,7.DOI:10.7606/j.issn.1000-7601.2016.06.43
基于离散单元法的螺旋输送装置工作过程数值模拟
Numerical simulation of working process of screw conveyer based on discrete element method
摘要
Abstract
In order to verify the feasibility of applying combined conveyor device into small harvester and research the flow rule of grain,this paper based on the granular mechanics,according to the discrete element method (DEM) analyzed the conveying mechanism of screw conveyor.Through established the three-dimensional model of conveyor,analyzed its movement in conveyor taken pea as an example.applying the visual discrete element simulated software EDEM analyzed the change situation of pea grain contact numbers,pea velocity,pea pressure and total energy consumption during conveying process by equal and variable pitch of screw,preliminarily discussed the cause of grain broken,and experimental verification has been conducted for the convey speed and broken rate.The results showed that:Relative to the equal pitch transportation,by variable pitch transportation the conveying velocity can be increased,while the energy consumption can be reduced,also the grain pressure and large contact numbers were mainly concentrated in the early conveying period.So the variable pitch transportation was not only increased the conveying efficiency by raising the conveying grain speed,but also reduced the squeeze and friction between particles and grain with blades,and then improved the grains broken phenomenon in conveying process.The maximal grain pressure force position was mainly concentrated between the external diameter of screw blade and case inner wall and the junction of two conveyers.关键词
收获机/螺旋输送器/离散元法/EDEM/破碎率Key words
harvester/screw conveyor/discrete element method/EDEM/broken rate分类
农业科技引用本文复制引用
张克平,王国华,柴强..基于离散单元法的螺旋输送装置工作过程数值模拟[J].干旱地区农业研究,2016,34(6):285-291,7.基金项目
国家科技支撑计划(2012BAD14B10) （2012BAD14B10）
国家公益性行业计划课题(20110301) （20110301）
国家自然科学基金项目(51265001) （51265001）
甘肃省自然科学基金(1506RJZA021) （1506RJZA021）
甘肃农业大学伏羲青年英才培养计划项目(FXYC20130103) （FXYC20130103）
甘肃农业大学青年导师基金(GAU-QNDS-201405) （GAU-QNDS-201405）
