流槽对筒仓双侧壁卸料动态压力分布影响研究  

Study on Effects of Flow Groove on Dynamic Pressure Distribution of Double-Wall Unloading of Silo

作　　者：徐志军[1] 程远浩 原方[1] 张冉冉 Xu Zhijun;Cheng Yuanhao;Yuan Fang;Zhang Ranran(College of Civil Engineering,Henan University of Technology,Zhengzhou 450052)

机构地区：[1]河南工业大学土木工程学院,郑州450001

出　　处：《中国粮油学报》2021年第5期135-141,共7页Journal of the Chinese Cereals and Oils Association

基　　金：国家自然科学基金面上项目(51578216)。

摘　　要：通过模型实验和离散元模拟,研究安装流槽对筒仓动态侧压力环向分布规律的影响,分析颗粒在普通筒仓双侧壁卸料和带流槽双侧壁卸料过程中的力学行为。研究表明:(1)在筒仓0.6~1.1 m深度范围内带流槽筒仓双侧壁卸料工况下侧压力均要小于普通筒仓双侧壁卸料;(2)与大偏心单侧壁卸料模式一样,双侧壁对称卸料模式下同一水平面环向侧压力分布并不均匀,依然存在压力耳朵区域、静止区域和流动通道区域,3个区域中流槽对压力耳朵区域影响最大;(3)通过观察流态和速度场,结合试验数据阐述了流槽降低动态侧压力的工作机理:流槽的流动形式为混合流动,这种流动形式能直接破掉拱角,使瞬时拱无法形成,从而有效降低动态侧压力。通过对2种工况动态侧压力及流态的分析,验证流槽的减压机理,为之后筒仓的设计提供参考。By using model test method and discrete element simulation method,the effect of the installation of flow groove on the annular distribution law of dynamic side pressure in silo was studied,and the mechanical behavior of particles in the process of common silo double-wall unloading and double-wall unloading with flow groove was analyzed.The results indicated that:(1)In the range of 0.6~1.1 m depth of the silo,the side pressure of double-wall discharging of the silo with flow groove was lower than that of ordinary double-wall discharging;(2)Similar to the single side wall discharging mode with large eccentricity,the annular lateral pressure distribution on the same horizontal plane was not uniform under the two-side wall symmetrical discharging mode,and there were still pressure ear regions,stationary regions and flow channel regions.In the three regions,the flow groove had the greatest influence on the pressure ear regions;(3)By observing the flow pattern and velocity field and combining with the experimental data,the working mechanism of flow groove to reduce dynamic side pressure was described:the flow form of the flow groove was mixed flow,which could directly break the arch angle and make the instantaneous arch unable to form,thus,effectively reducing the dynamic lateral pressure.Through the analysis of the dynamic side pressure and flow pattern of the two working conditions,the decompression mechanism of the flow groove was verified,which provided a reference for the later design of the silo.

关 键 词：筒仓 动态压力 流槽 双侧壁卸料 流态 

分 类 号：S263[农业科学—农业水土工程]