带锥斗筒仓内小麦堆孔隙率分布研究

Research on Porosity Distribution of paddy in Silos

文章构建带锥斗筒仓中小麦堆的分层压缩微分方程组,使用回弹模量仪和粮食孔隙测量仪测量小麦堆的无压缩密度与孔隙率、压缩密度。数值求解微分方程得出筒仓中小麦堆密度的分布值,由无压缩密度(表层)、无压缩孔隙率(表层)及筒仓深处的密度计算出筒仓中小麦孔隙率的分布值。实验与计算结果表明:在带锥斗筒仓的筒体部分,小麦堆孔隙率随着粮层深度的增加而减小;到筒仓的锥斗处,小麦堆孔隙率转而随着粮层加深而增大;在筒仓筒体中相同深处,小麦堆孔隙率随筒体直径的增加而减小。

The LHT-2 rebound modulus tester was used to determine the compression density of wheat. The differential equations of density,pressure and depth in a silo was built. Numerical method was used to obtain the relationship of density and depth. The porosity of surface layer of wheat(no compression) was measured by grain porosity meter. According to the porosity of surface layer, the density of surface layer and densities in silo calculated, the relation between grain porosity and grain depth in silo was calculated. Calculation results show that in a silo with a cone hopper, porosity of paddy in cylinder of silo decreased with the wheat depth, the porosity of paddy in cone hopper increased with the increase of depth. At the same depth, the porosity of wheat decreases with the increase of silo diameter.