Abstract
Mechanization of field experiments is the only way to improve crop breeding and seed propagation effects. In order to further clarify and improve the working performance of tapered threshing device for plot breeding, and reduce the remaining seeds in the device, the numerical simulation was carried out on the motion process of materials in the longitudinal-axial tapered cylinder threshing and transmission device of the plot wheat breeding combine harvester based on CFD-DEM method. Simulation results showed that, threshing and transmission of particles and short stalks at axial direction could be realized under the influence of air flow. Meanwhile, the material transference and distribution rule and stream field distribution rule of air flow in the threshing and transmission device were obtained, the variations of velocity and displacement of particles and short stalks with time were obtained; the motion trajectories and forms of particles in different types of retention were also studied. At rotating speed of 1300-1600 r/min for the tapered threshing cylinder in the verification test, the particle retention rate in the enclosure was 0-0.13%, while in the simulation the particle retention rate in the enclosure was 0-0.11%, only a 0.02% difference between them. The results proved a favorable feasibility to simulate the working performance of the tapered threshing and transmission device for plot breeding through gas-solid coupling method. Keywords: particle threshing and transmission, tapered threshing and transmission device, hydromechanics calculation, discrete element, numerical simulation, test DOI: 10.25165/j.ijabe.20191201.4458 Citation: Dai F, Song X F, Zhao W Y, Han Z S, Zhang F W, Zhang S L. Motion simulation and test on threshed grains in tapered threshing and transmission device for plot wheat breeding based on CFD-DEM. Int J Agric & Biol Eng, 2019; 12(1): 66–73.
Highlights
Breeding industry is a chief means to increase grain production and safeguard national food security
The area of foreign pilot plots is large with a wide separate zone, their harvesting machineries are generally large in size, complicated in structure, expensive and difficult to adapt to the real practice in China, whose pilot plots are small with narrow isolation zone[4]
3.1 Gas governing equation Computational fluid dynamics (CFD) is a kind of numerical simulation on fluid controlled by mass conservation equation, momentum conservation equation and energy conservation equation
Summary
Breeding industry is a chief means to increase grain production and safeguard national food security. Seed retention within the threshing and transmission device has been the focus and difficulty that has not been completely solved in the research field. The complicated structure of seed breeding and threshing machines resulted in the problems of seed retention, difficulty in cleaning, seed mixing and low efficiency[8]. To address this problem, the numerical simulation of the motion process of particles in the tapered threshing and transmission device of the plot wheat breeding combine harvester was carried out through the CFD-DEM method, aiming to further improve the working performance of the tapered threshing and transmission device and reduce grain retention within the enclosure of the device. 2019 Dai F, et al Motion simulation and test on threshed grains in tapered threshing and transmission device for plot wheat breeding Vol 12 No.
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