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| Influence of seeds spatial distribution on suction performance of precision vacuum seeder |
1.Key Laboratory of Modern Agricultural Equipment and Technology,Ministry of Education and Jiangsu Province,Jiangsu University,Zhenjiang,Jiangsu 212013,China; 2.School of Mechanical Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China）
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Abstract According to the force model of seeds during the suction process,the standard k-ε turbulence model was adopted and the force values on seeds in the real gas field nearby the vacuum nozzle of precision seeder were calculated using the CFD software Fluent. By assuming the seeds in the vibration tray are distributed with regular tetrahedron,the influence of seeds lay thickness,n,differential pressure,Δp,seeds gap coefficient,λ,and diameter ratio of nozzle and seed,γ,on the force values were analyzed. The calculation results indicate that with the increase of Δp,the force values increase quickly at large γ and slowly at small γ. With the increase of λ,the force values first increase rapidly for λ1.25 and then increase slower for λ1.25. Combined with the discrete element method（DEM） to simulate the seeds motion states under vibration plate,the optimum working parameters were obtained. The rape seeds were selected as materials and the experimental results show that the suction ratio is higher than 98%.
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2009, Vol. 30 
