Numerical simulation and experiment of air distribution seed-metering device based on coupled EDEM-Fluent

ZOU Yi; HAO Xiangze; HE Ruiyin

doi:10.7671/j.issn.1001-411X.2017.04.018

Journal of South China Agricultural University > 2017 > 38(4): 110-116. > DOI: 10.7671/j.issn.1001-411X.2017.04.018

ZOU Yi, HAO Xiangze, HE Ruiyin. Numerical simulation and experiment of air distribution seed-metering device based on coupled EDEM-Fluent[J]. Journal of South China Agricultural University, 2017, 38(4): 110-116. DOI: 10.7671/j.issn.1001-411X.2017.04.018

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Numerical simulation and experiment of air distribution seed-metering device based on coupled EDEM-Fluent

College of Engineering, Nanjing Agricultural University, Nanjing 210031, China

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Received Date: September 19, 2016
Available Online: May 17, 2023

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Abstract

Abstract

Objective
To solve the problems of slow speed and inefficiency in mechanical seeding of rice.
Method
Rice was directly seeded using the air distribution seed-metering device. An α-R air distribution seed-metering device was designed and optimized. It consisted a bell type lumen with adjustable R and a shunt seal cap with adjustable α. Numerical simulations of air distribution and metering process were performed by using EDEM-Fluent coupling module, and the bench test on seeding performance was carried out.
Result
The simulation results showed that the highest velocity of rice particles in the combined α-R distributor was 5.416 m·s^-1. The area of vortex stagnation was smaller than that of the traditional structure. Rice particles were discharged smoothly from the dispenser. When R=180 mm and α=20°, the variation coefficient of uniformity was 24.56%, the variation coefficient of consistency among rows was 3.79%, the variation coefficient of total displacement stability was 1.23%, and the three indicators were all the optimum values. Bench test was carried out using distributors printed by 3D printer and the results showed that the variation coefficient of uniformity for the seed-metering device was 29.17%-30.86%, the variation coefficient of consistency among rows was 4.13%-4.33% and the variation coefficient of total displacement stability was 1.4%-1.7%, which met the requirements of mechanical seeding of rice.
Conclusion
The results from multiple tests are stable and close to the simulation results. The designed air distribution seed-metering device can meet practical requirements, suggesting that using the EDEM-Fluent coupling simulation is correct and feasible.
- air distribution,
- seed-metering device,
- rice,
- EDEM-Fluent,
- simulation

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References

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