Feng Yong, Wang Chao, Wang Peryan, Qin Dajing, Li Yuan
College of Civil Engineering, Henan University of Technology, Zhengzhou, 450000, Henan, China.
Eur Phys J E Soft Matter. 2022 Sep 28;45(9):80. doi: 10.1140/epje/s10189-022-00234-x.
The arch stress of grain particles during the discharge of the silo is very important to the safety of the silo. At present, most silos adopt the standard discharge port size. To improve the discharge efficiency, it is generally achieved by changing the angle of the discharge port. In this article, an improved silo model is used to study the discharge experiments in the silo with five inclination angles of the discharge port, and analyze the normal force distribution of the wheat grains at the arch, comparing the normal force distribution under five different discharge rates. From the results given, when the angle of the discharge port is 45°, the area where the normal force among particles is larger is wider. At other flow rates, increasing the flow rate can shorten the arching period. During the arching cycle, the normal force among particles in the center area of the silo at the same height is smaller than at the silo wall and is negatively correlated with the discharge rate. In addition, the normal force on the silo wall gradually decreases with the increase in the discharge rate.
筒仓卸料过程中颗粒的拱应力对筒仓安全非常重要。目前，大多数筒仓采用标准卸料口尺寸。为提高卸料效率，通常通过改变卸料口角度来实现。本文采用改进的筒仓模型，对卸料口有五个倾斜角度的筒仓进行卸料实验研究，分析小麦颗粒在拱处的法向力分布，比较五种不同卸料速率下的法向力分布。从给出的结果来看，当卸料口角度为45°时，颗粒间法向力较大的区域更宽。在其他流速下，增加流速可缩短起拱周期。在起拱周期内，筒仓同一高度中心区域颗粒间的法向力小于筒仓壁处的法向力，且与卸料速率呈负相关。此外，筒仓壁上的法向力随卸料速率的增加而逐渐减小。
