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Design and performance of a countersunk screen in a maize cleaning device
Biosystems Engineering ( IF 5.1 ) Pub Date : 2021-08-02 , DOI: 10.1016/j.biosystemseng.2021.07.008
Lijun Wang 1 , Jin Chai 1 , Housheng Wang 1 , Yingshuai Wang 1
Affiliation  

To increase the probability of particle penetration and decrease grain loss in maize cleaning devices, a countersunk screen was designed to enable particles move towards screen holes. The factors affecting the tendency of particles to penetrate screen holes and the various behaviours of particles penetrating screen holes were analysed by numerical simulation using couples computational fluid dynamics and the discrete element method (CFD-DEM). Simulations of a threshed maize mixture moving in a typical cleaning device were carried. An airflow of 12.8 m s−1 and the direction angle of 25° was utilised. Among the three kinds of arrangements of screen holes investigated, cleaning performance of a countersunk screen with H-type arrangement of screen holes was the best. The impact angle of particles on the screen was influenced by the airflow direction angle, and the speed of maize particles was the main factor influencing probability of penetration of particles. Screening efficiency was the best at an airflow velocity of 11.2 m s−1. As the angle of the sidewall around screen hole increased from 40° to 60°, the tendency of grains to penetrate the screen holes was enhanced. Grains slipping along the sidewall penetrated the countersunk screen hole with high efficiency, reducing inefficient impacts. The screening efficiency of cleaning device with countersunk screen was 35.20% greater than that with the similar standard round-hole screen.



中文翻译:

玉米清洗装置埋头筛的设计与性能

为了增加玉米清洁设备中颗粒渗透的可能性并减少谷物损失,设计了埋头筛以使颗粒移动到筛孔。采用计算流体动力学耦合法和离散元法(CFD-DEM)进行数值模拟,分析了影响颗粒穿透筛孔趋势的因素以及颗粒穿透筛孔的各种行为。对在典型清洁设备中移动的脱粒玉米混合物进行了模拟。12.8 m s -1的气流并且使用了25°的方向角。在所考察的三种筛孔排列方式中,以H型筛孔排列的沉头筛清洗效果最好。颗粒在筛网上的撞击角度受气流方向角的影响,玉米颗粒的速度是影响颗粒穿透概率的主要因素。气流速度为11.2 m s -1 时筛分效率最好. 随着筛孔周围侧壁的角度从40°增加到60°,晶粒穿透筛孔的趋势增强。沿侧壁滑动的谷物高效穿透沉头筛孔,减少低效冲击。沉头筛清扫装置筛分效率比同类标准圆孔筛高35.20%。

更新日期:2021-08-03
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