摘要
筒仓储料的特征高度是Janssen公式中影响筒仓储料压力计算准确性的重要参数,为了进一步缩小筒仓储料压力的理论值与真实值之间的偏差,该研究对筒仓储料的特征高度进行试验研究。该研究利用筒仓储料压力综合试验装置,对小麦储料堆的底部竖向压力和仓壁总摩擦力进行测量,并根据储料堆的底部竖向压力和仓壁总摩擦力与特征高度之间的关系计算得到特征高度的值。研究了整个储料堆的特征高度与储料填充高度的关系,探讨了储料堆内部的特征高度与填充高度的关系以及储料堆内部的特征高度的分布规律。得到如下结论:1)筒仓储料堆的特征高度的试验值大于Janssen理论值。2)储料堆的底部竖向压力的测试值大于Janssen理论值,筒仓仓壁总摩擦力的测试值小于Janssen理论值。3)对于筒仓整个储料堆的特征高度λ,当高径比H/D<0.9时,随着储料填充高度的增加而逐渐减小;当高径比H/D≥0.9时,特征高度λ值几乎保持不变。4)对于储料堆中不同半径实心圆柱的特征高度,当高径比H/D<0.9时,均随着储料填充高度的增加而逐渐减小;当高径比H/D≥0.9时,随着储料填充高度的增加,半径最大的圆柱(即整个储料堆)的特征高度几乎保持不变,其余圆柱的特征高度以不同速率呈非线性逐渐减小并趋于相等。5)储料堆中不同半径实心圆柱的特征高度基本随着圆柱半径的增大而减小。该研究为Janssen公式中储料特征高度的确定提供一种试验方法,使Janssen公式能够用于筒仓储料压力的精确计算。
Because Janssen formula is derived under certain assumptions,there is a certain deviation between the theoretical value and the real value of the storage material pressure in silo.The characteristic height of storage material in silo is an important parameter in Janssen formula,which affects the accuracy of calculation.Therefore,the experimental study on the characteristic height of storage material in silo was carried out in this study.The vertical pressure at the bottom of the storage material pile and the total friction force on the silo wall were measured by using the comprehensive test device for measuring the storage material pressure in silo,when wheat was used as storage material.And the value of the characteristic height was calculated according to the relationship between the vertical pressure at the bottom of the storage material pile and the characteristic height and the relationship between the total friction force on the wall and the characteristic height.The relationship between the characteristic height of the whole storage material pile and the filling height was studied.The relationship between the characteristic height in the storage material pile and the filling height,and the distribution law of the characteristic height in the storage material pile were discussed.The conclusions are as follows:1)The test value of characteristic height of storage material pile in silo is greater than theoretical value of Janssen formula.2)The measured value of vertical pressure at the bottom of the storage pile is greater than theoretical value of Janssen formula,and the measured value of total friction force on the silo wall is less than theoretical value of Janssen formula.When the ratio of height to diameter H/D less than 1.5,the measured value of vertical pressure at the bottom of the storage pile and the total friction force on the silo wall are close to theoretical value of Janssen formula,and the relative difference(the absolute difference between the measured value and the theoretical value divided by
作者
陈家豪
陈桂香
刘文磊
葛蒙蒙
谭晗洋
Chen Jiahao;Chen Guixiang;Liu Wenlei;Ge Mengmeng;Tan Hanyang(School of Engineering and Architecture,Henan University of Techonology,Zhengzhou 450001,China;Henan Key Labratory of Gain Storage Facility and Safety,Zhengzhou 450001,China)
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2020年第15期307-316,共10页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家粮食公益性行业科研专项(201513001)
国家自然科学基金项目(51608176)
河南省科技厅科技攻关(202102110118)
河南省教育厅重点科研项目基础研究计划(20A560010)
河南工业大学高层次人才科研启动基金(31401176)
河南省粮油仓储建筑与安全重点实验室开放课题(2020KF-B01)。
关键词
筒仓
压力
特征高度
储料
摩擦系数
侧压力系数
silo
pressure
characteristic height
storage material
coefficient of friction
lateral pressure coefficient
