湖南农业大学学报（自然科学版）2025，Vol.51Issue(3)：89-96,8.DOI:10.13331/j.cnki.jhau.2025.03.012
基于扩散环的油菜气送式集排器设计与排种性能分析
Structure optimization and sowing performance analysis of the air-assisted centralized metering device for rapeseed based on the diffusion ring
摘要
Abstract
An air-assisted centralized metering device for rapeseed was designed based on diffusion ring,including seed supply device,seed transport pipe,diffusion ring,distributor,seed discharge pipe,air pump,seed box,etc.The top angle of the distributor and the diffusion ring configuration were optimized for the bowl-type branch distributor.The influence of top angle of the distributor and diffusion ring configuration on the seed uniformity of the rapeseed air-assisted centralized metering device under tilted angles from-10° to 10° was investigated by DEM-CFD coupled simulation and verified by the central composite multi-factor bench test.The simulation results showed that the variation coefficient of consistency of row displacement(CV)fluctuated between 14.11%and 18.96%for the rapeseed air-assisted centralized metering without diffusion ring under the top angle of 120°.When the top angle was 150°,the average CV was the smallest,at 13.65%,indicating poor seed discharge uniformity in the rapeseed air-assisted centralized metering device without diffusion ring.When the diffusion ring was located near the air supply elbow(diffusion ring configuration 3),the air-assisted centralized metering device had the best seed distribution uniformity.With the increase of top angle of the distributor,the CV decreased rapidly with the tilt angle.When the top angle was 150° and 165°,the fluctuation range was 6.51%-8.11%and 6.21%-7.66%,respectively.The multi-factor bench test result showed that the air-assisted centralized metering device with diffusion ring configuration 3 and top angle of 150° had the best seed uniformity with the CV at 6.03%-7.03%,which was close to the simulation test result,with the relative error among-0.31%-2.22%.关键词
油菜/气送式集排器/扩散环位形/导流板锥顶角/变异系数Key words
rapeseed/air-assisted centralized metering device/diffusion ring configuration/top angle of the distributor/variation coefficient分类
农业科技引用本文复制引用
张乐,刘亚夫,吴明亮,吴志立..基于扩散环的油菜气送式集排器设计与排种性能分析[J].湖南农业大学学报（自然科学版）,2025,51(3):89-96,8.基金项目
湖南省农业农村厅农机研发制造推广应用一体化试点项目(2023-08) （2023-08）
