Abstract
In order to further clarify and improve the working performance of separating cleaner for flax threshing materials, and study the migration law and characteristics of components of flax threshing materials during separating and cleaning, in this paper, a gas-solid coupling simulation model was established on the separation cleaner for flax threshing materials and a numerical simulation was carried out on the separating and cleaning process. Simulation results showed that, the separating and cleaning effect of the components of flax threshing materials was good under the air-and-screen gas-solid coupling flow field. Meanwhile, the form distribution and the vector distribution of air volume and velocity of flax threshing materials in the air-and-screen devices were obtained. By referring to the migration trajectories of the flax threshing materials in the vibration sieve device, double channel residue collection device and dust absorber, the volume variation, motion trajectories and variation of migration velocity of the components of flax threshing materials over time in different regions were explored. Verification test results showed that, the content impurity rate of the separation cleaner for flax threshing materials was 2.06%, and loss rate in cleaning was 3.08%. Compared with simulation results, the verification test results were 1.23% and 0.42% higher, showing that the established discrete element model on the flax threshing materials and parameter setting were basically feasible. The verification test also verified the correctness of the simulation results of the separating and cleaning process of the flax threshing materials based on gas-solid coupling theory and the feasibility of the research method. Keywords: flax threshing materials, separation cleaner, air-and-screen, gas-solid coupling, discrete element model, numerical simulation DOI: 10.25165/j.ijabe.20211403.6058 Citation: Dai F, Song X F, Shi R J, Zhao W Y, Guo W J, Zhang Y. Migration law of flax threshing materials in double channel air-and-screen separating cleaner. Int J Agric & Biol Eng, 2021; 14(3): 92–102.
Highlights
The migration of agricultural material flow in separating cleaner is a complicated process of two-phase flow, where there are both effect of solid phase on solid phase and gas phase to solid phase[1,2]
Mekonnen et al.[7] applied the method of computational fluid mechanics to study the effect of different positions of vortex wall on the horizontal axial flow distribution of grain combine harvester; Jiang et al.[8] simulated the motion law of grains in the separation chamber of the combine harvester and carried out tests based on Computational Fluid DynamicsDiscrete Element Method (CFD-DEM) coupling, and explored the effective method of improving the preliminary grain cleaning performance of the separating chamber
In view of the little difference of components of flax threshing material, which have high impurity rate and cause serious loss in separation and cleaning[4], the double channel air-and-screen separating cleaner for flax threshing material based on two-stage harvesting need to be further studied[9]
Summary
The migration of agricultural material flow in separating cleaner is a complicated process of two-phase flow, where there are both effect of solid phase on solid phase and gas phase to solid phase[1,2]. Li et al utilized the Computational Fluid DynamicsDiscrete Element Method (CFD-DEM) to study motion law and velocity of rice grains and stalks on single-layer vibration sieve, and proved the feasibility of this research method[2]; Cleary et al simulated the screening process of 8000 particles with particle size of 10-80 mm[5]; Wang et al applied gas-solid coupling theory to reveal the motion law of threshed material of corn in the double-layer cross air-and-screen cleaner and acquired the method of adjusting the working parameters to improve the grain cleaning rate[1,6]. Vol 14 No 3 93 and cleaning of flax threshing materials based on “air flow cleaning and air-and-screen separation”, and will improve the working performance of the double channel air-and-screen separation cleaner for flax threshing materials
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