基于DEM模拟的筒仓卸料过程瞬时拱影响因素分析
Analysis of influence factors of instantaneous arch during silo discharging process based on DEM simulation
韦熙 1周甲伟 1徐耀杰1
作者信息
- 1. 华北水利水电大学机械学院,郑州 450045
- 折叠
摘要
为探究大豆在筒仓卸料过程的瞬时拱形成条件及各因素的影响规律,阐明大豆在筒仓内的流变特性,采用离散元方法(DEM),以大豆在筒仓内的卸料过程为对象,通过改变筒仓的半锥角、开口直径、颗粒间摩擦系数、物料密实度等参数,分别进行模拟仿真.结果表明,半锥角为30°,35°,45°时,最大压力值分别为2390.76,2289.53,2540.9 Pa;开口直径为50,60,70 mm时,卸料时间分别为103,62,40 s;摩擦系数设置为0.6,0.7,0.8时,卸料时间分别为61.9,64.9,67.2 s;密实度设置为500,750,1000 mm时,最大质量流量分别为0.44,0.50,0.67 kg/s.研究为更精确地寻求其他散料食品在筒仓卸料过程的流变特性提供参考.
Abstract
To explore the instantaneous arch formation condition of soybeans during the unloading process of silos and the influence rules of various factors on it,and to clarify the rheological characteristics of soybeans in silos,the discrete element method(DEM) was used,and the unloading process of soybeans in the silo was taken as the object to conduct simulations respectively by changing the semi cone angle,opening diameter,inter particle friction coefficient,material density and other parameters of the silo.The results show that when the half cone angles are 30°,35°,and 45°,the maximum pressure values are 2390.76,2289.53,2540.9 Pa,respectively;When the opening diameters are 50,60,70 mm,the unloading time are 103,62,40 s,respectively;When the friction coefficient is set to 0.6,0.7,0.8,the unloading time is 61.9,64.9,67.2s,respectively;When the density is set to 500,750,1000 mm,the maximum mass flow rates are 0.44,0.50,0.67 kg/s,respectively.The study provides a reference for seeking more accurate rheological properties of other bulk foods during the unloading process of silos.
关键词
离散元方法/筒仓/卸料/瞬时拱/影响因素Key words
discrete element method(DEM)/silo/unloading/instantaneous arch/influence factor引用本文复制引用
基金项目
国家自然科学基金项目(52275110)
河南省科技攻关项目(232102220086)
河南省高校科技创新人才计划项目(24HASTIT044)
出版年
2024
国家科技期刊平台
NSTL
万方数据