数字农科院2.0

Computational fluid dynamics analysis of the airflow field inside a cyclone of a combine harvester with adjustable blocks

文献类型： 外文期刊

作者： Wan Xingyu;Yuan Jiacheng;Liao Qingxi;Wu Chongyou;Zhang Min;Guan Zhuohuai;Li Haitong

作者机构：

关键词： Agricultural mechanization;CFD;Combine harvester;Cyclone;Magnetic block;Rapeseed

期刊名称： Biosystems Engineering

ISSN： 1537-5110

年卷期： 2023 年 230 卷

页码：

收录情况： SCIE（2023版） ; ; EI（2023版）

摘要： Existing combine harvesters used for rapeseed still have challenges. To simplify the structure of the harvester and reduce losses a new type of cyclone is proposed as a cleaning device. It has several spiral arranged adjustable magnetic blocks fitted at the bottom of the cyclone to disrupt and reduce any dead zone in the airflow field. To establish the effect of altering the dead zone of the airflow field, the motion of a single rapeseed in the cyclone was analysed based on the kinematics and dynamics. A simulation model of the cyclone, based on computational fluid dynamics, was established to optimise the arrangement of the magnetic blocks within the cyclone. The influences of helix angle, distance and spiral number of the magnetics blocks on the airflow were explored through a single-factor simulation experiment, which determined the optimal number of spirals as 4. Subsequently, the air velocity of the inlet and materials other than grain (MOG) at the outlet were added as factors to carry out the Box-Behnken designed experiment. Results showed the optimal combination of parameters were an inlet air velocity 4.2 m s−1, a MOG outlet air velocity 27.4 m s−1, a helix angle 64.2° and distance between magnetics blocks 52.4 mm. Bench tests and field experiment were conducted to validate the performance of the cleaning device under the optimum conditions. The results showed that the average cleaning ratio and loss ratio of the rapeseed were 88.96% and 4.12%, respectively.

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