Numerical simulation and experiment of grain motion in the conveying system of ratooning rice harvesting machine

The mixtures, grains, and residues in the ratooning rice harvesting machine need to be conveyed forward, backward, upward, downward. Due such operations, often accumulation blockage take place at intersection of a horizontal-vertical screw conveyor, resulting low efficiency, high power consumption, even grain damage. In this study, CFD-DEM approach was applied address above problems. Firstly, pneumatic conveying device designed for rice, then motion grains airflow field analyzed detail. effects different cross-sectional heights lengths contraction section related mixing cavity were examined. Finally, three-factor quadratic regression orthogonal rotational combination method adopted experiment, fan velocity, filling coefficient, speed horizontal conveyor taken as test factors. results showed that with increasing height cavity, velocity decreased dispersity increased. With length area high-speed zone increased diffusion effect enhanced. At 2700 r/min, coefficient 0.41, 1173 outlet flow optimization index highest, which 45.9% higher than obtained without airflow. Keywords: motion, machine, DOI: 10.25165/j.ijabe.20221503.6681 Citation: Liu W J, Luo X W, Zeng S, Zang Y, Wen Z Q, L, et al. Numerical simulation experiment system machine. Int J Agric & Biol Eng, 2022; 15(3): 103–115.