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Simulation Analysis on Air Current Field of Positive-pressure for Metering Device of Maize Precision Planter

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  131589598,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: http://dx.doi.org/10.13031/aim.20131589598) @2013
Authors:   Song Shi, Dongxing Zhang, Tao Cui
Keywords:   Maize metering-device FLUENT Air current field Simulation Experiment

Abstract. Based on the principle of aerodynamic seed-filling and pressure differential seed-taking, the positive-pressure maize precision metering device was designed and tested. In order to optimize the mechanical structure parameters and the movement of air flow in the positive-pressure maize precision metering device, simulation research was carried out with orthogonal method and FLUENT tools. Three factors; the quantity of holes, the angle of air inlet and the position of air inlet were selected to study their influences on air current and seeding quality. Simulation analysis based on the turbulence model of RNG k-ε and the numerical predictions of SIMPLE method was done. In addition, the research results were also validated by the experiment. Its performance such as working air pressure, seed overlap index, missing index and seed allocation eligible rates were investigated under laboratory conditions, Through the comparisons of optimal parameters between the simulation and the experiment, the validity of the simulation results were confirmed. The research revealed that the area of slot hole on the metering device disc and the angle of air inlet on the coat of metering device is the pivotal factor.

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