筒仓中稻谷的空隙率分布研究  

Research on Porosity Distribution of Paddy in Silos

作　　者：唐福元[1,2] 许倩 程绪铎[1,2] 

机构地区：[1]南京财经大学食品科学与工程学院 [2]江苏省现代粮食流通与安全协同创新中心,南京210046

出　　处：《中国粮油学报》2017年第12期110-116,共7页Journal of the Chinese Cereals and Oils Association

基　　金：国家自然科学基金(31371856);江苏高校优势学科建设工程(PAPD)

摘　　要：采用LHT-1粮食回弹模量仪测定稻谷(南粳5055)堆的表层密度及压缩密度,建立筒仓中稻谷堆的密度、应力与粮层深度关系的微分方程组,用数值方法计算筒仓中稻谷密度与粮层深度关系。采用粮食孔隙率测量仪测定表层稻谷(无压缩)孔隙率,由表层孔隙率,表层密度及筒仓深处的密度计算出筒仓中稻谷孔隙率与粮层深度关系。计算结果表明:在直径20米的筒仓中,在30米的筒体部分,南粳5055空隙率变化范围为61.00%~56.32%,在10 m的锥斗中,空隙率变化范围为56.32%~59.77%;在带锥斗筒仓的筒体部分,稻谷堆孔隙率随着粮层深度的增加而减小;到锥斗部分,稻谷堆孔隙率随着粮层深度的增加而逐渐增大。在不同直径的筒仓的筒体部分,在同一深度,稻谷堆孔隙率随着筒仓直径的增大而减小。The LHT - 1 rebound modulus tester was used to determine the compression density of paddy（South japonica5055）. 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 paddy （ no compression） was measured by grain porosity meter. According to the porosity of surface layer, the density of surface layer and densities calculated in the silo, the relation between grain porosity and grain depth in silo was calculated. Calculation results show that in the 30 meter cylinder part of a silo with a diameter of 20 meters, the change range of the porosity of South japonica5055 paddy is 61.00% - 56.32%, and in the cone hopper of 10 meters of the silo, the change range of porosity is 56.32% -59.77% ; in a silo with a cone hopper, porosity of paddy in cylinder of silo decreased with the paddy depth, the porosity of paddy in cone hopper increased with the increase of depth. At the same depth, the porosity of paddy decreases with the increase of silo diameter.

关 键 词：筒仓 稻谷 孔隙率 密度 

分 类 号：TS210.4[轻工技术与工程—粮食、油脂及植物蛋白工程]