农业机械学报2017，Vol.48Issue(11)：43-51,9.DOI:10.6041/j.issn.1000-1298.2017.11.006
基于EDEM-CFD耦合的内充气吹式排种器优化与试验
Optimization and Experiment of Inside-filling Air-blowing Seed Metering Device Based on EDEM-CFD
摘要
Abstract
According to the present situation of the sowing effect of original inside-filling air-blowing seed metering device for fiat seeds is better than circles,the phenomenon of drag force greatly affects the cleaning and pressingeffect was found through the force analysis of seed in cleaning and pressing process for optimization the sowing effect of circle and mixed seeds.For analyzing the changing of drag force of different seed metering discs in the process of working under the same operational parameter,the bonded particle model was used to model maize based on theory of discrete element method,the coupling analysis method of EDEM-CFD was applied to couple simulation circle seeds with three different hole structures of seed metering discs.The value of drag force of seed in the hole during rotation of seed metering disc was taken as indicator,the changing situation of drag force of seed was analyzed under the operational parameter of inlet air velocity was 30 m/s and forward speed was 8 km/h with different seed metering discs.Simulation results showed that the drag force of big circle seed was larger than that of small circle due to different particle windward areas in the same type seed metering disc under the same working conditions.In other words,large granular seeds were more likely to be cleaned out of holes.Based on cleaning and pressing performance analysis of different seed discs,the drag force and pressing force in the hole of seed disc with block slot were both larger.And due to the volume of seed filling in the holes was increased compared with other discs,the effect of seed disc with block slot sowing circle and mixed seeds were both better through simulation.The single factor test of working pressure was carried out when forward speed of the different seed discs was 8 km/h,experimental results showed that the qualified rate of seed disc with block slot was increased gradually with the increase of working pressure,which was better than the other two.The full factorial experiments were conducted on the seed disc with block slot forward speed of 4 ～ 12 km/h and working pressure of 4 ～ 8 kPa,experimental results showed that the qualified rate was increased gradually with the increase of forward speed and working pressure,the qualified rate was close to 96％ and leakage rate was less than 1％ when working pressure was above 6 kPa.关键词
精量排种器/内充气吹式/离散单元法/EDEM-CFD/结构优化Key words
precision seed metering device/inside-filling air-blowing/discrete element method/EDEM-CFD/structure optimization分类
农业科技引用本文复制引用
韩丹丹,张东兴,杨丽,崔涛,丁友强,卞晓慧..基于EDEM-CFD耦合的内充气吹式排种器优化与试验[J].农业机械学报,2017,48(11):43-51,9.基金项目
国家自然科学基金项目(51375483、51575515)、现代农业产业技术体系建设项目(21226003)和农业部土壤-机器-植物系统技术重点实验室项目 （51375483、51575515）
