Numerical Simulation of Seed-Movement Characteristics in New Maize Delivery Device

Rui Liu, Lijing Liu (), Yanjun Li, Zhongjun Liu, Jinhui Zhao, Yunqiang Liu and Xuedong Zhang
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Rui Liu: College of Engineering, China Agricultural University, Beijing 100083, China
Lijing Liu: College of Engineering, China Agricultural University, Beijing 100083, China
Yanjun Li: School of Machinery and Automation, Weifang University, Weifang 261000, China
Zhongjun Liu: The State Key Laboratory of Soil, Plant and Machine System Technology, Beijing 100083, China
Jinhui Zhao: The State Key Laboratory of Soil, Plant and Machine System Technology, Beijing 100083, China
Yunqiang Liu: The State Key Laboratory of Soil, Plant and Machine System Technology, Beijing 100083, China
Xuedong Zhang: The State Key Laboratory of Soil, Plant and Machine System Technology, Beijing 100083, China

Agriculture, 2022, vol. 12, issue 11, 1-19

Abstract: The delivery device is one of the key components in ensuring uniform grain spacing and achieving high-speed precision seeding. In this paper, a new type of high-speed airflow-assisted delivery device for maize is presented. The gas–solid flow in the delivery device was numerically studied by the coupling method of CFD and DEM. The influence of the structural parameters of the delivery device on the movement of the seeds and the airflow field was analyzed in detail. The matching relationship between the inlet-airflow velocity and the operating speed of the seeder was explored. The results show that the position of the intake seed chamber mainly affects the negative pressure in the distribution area of the mixing chamber. The increase in the shrinkage angle results in the decrease in pressure loss and the decrease in airflow velocity in the delivery chamber. As the diffusion angle increases, the airflow forms a stable straight jet flow and the airflow velocity in the delivery chamber increases. As the ejection angle increases, the bouncing degree of the seed decreases, thereby ensuring the consistency of the seed-ejection direction. The research results show that, when the intake seed chamber is located in the middle, the shrinkage angle is 70°, the diffusion angle is 30°, and the exit angle is 60°, the air-assisted delivery device has better performance. With the increase in inlet wind speed, the seed-ejection speed can also be increased according to a certain proportion, which can meet the requirements of zero-speed seeding and ensure the uniformity of seed spacing, providing a new seed delivery scheme. In the future, if invasive damage to the seed shell is guaranteed to be minimized in high-speed airflow, the new delivery device can meet the requirements of precision seeding under high-speed conditions.

Keywords: delivery device; simulation analysis; high speed; airflow field; Zhengdan 958 (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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