Abstract

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.

Graphical abstract

中文翻译：

---

排粒率对拱法向力的影响

摘要

筒仓卸料过程中粮粒的拱形应力对筒仓的安全至关重要。目前大部分筒仓采用标准卸料口尺寸。为了提高出料效率，一般是通过改变出料口的角度来实现的。本文采用改进的筒仓模型，研究了仓内五种倾角卸料口的卸料试验，分析了拱部麦粒的法向力分布，比较了五种不同卸料下的法向力分布情况。率。由给出的结果可知，当出料口角度为45°时，颗粒间法向力较大的区域较宽。在其他流速下，增加流速可以缩短起拱期。在拱形循环中，筒仓中心区同高处颗粒间法向力小于筒仓壁处，与出料率呈负相关。此外，筒仓壁上的法向力随着卸料率的增加而逐渐减小。

图形概要