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基于DEM-CFD耦合的气吸式排种器仿真研究
投稿时间:2020-07-03    点此下载全文
引用本文:张凯,洪杨,徐祝欣.基于DEM-CFD耦合的气吸式排种器仿真研究[J].南京信息工程大学学报,2020,12(6):767~772
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作者单位
张凯 南京信息工程大学 自动化学院, 南京, 210044 
洪杨 南京信息工程大学 大气环境与装备技术协同创新中心, 南京, 210044 
徐祝欣 青岛普兰泰克机械科技有限公司, 青岛, 266109 
基金项目:国家重点研发计划(2017YFD0701201-02)
中文摘要:为提高大白菜等小粒径精密播种机的机械化水平,设计了一种小粒径气吸式排种器.首先利用JPS-12排种器性能检测试验台对排种器进行测试,得到不同参数组合下的性能指标与最优参数组合.然后使用计算流体力学方法(CFD),借助FLUENT软件分析了吸种器内部流场的分布,得到了吸种器内部压力分布云图和吸种孔截面云图.最后基于离散元法(DEM)建立大白菜种子颗粒模型,对排种器仿真模型进行简化和网格划分,完成了小粒径气吸式排种器DEM-CFD耦合仿真实验.对比台架与仿真试验结果,得出如下的结论:当排种盘转速为20 r/min,真空度为2.2 kPa时,排种性能最佳.
中文关键词:气吸式排种器  小粒径种子  离散元法  流体力学
 
Simulation of an air suction seed drainer based on DEM-CFD coupling
Abstract:An air suction seed drainer was designed and simulated in order to improve the mechanization level of precision seeders applicable for small size grains such as Chinese cabbage seeds.Firstly,the performance of the seed metering device was acquired through tests using performance test-bench of JPS-12,based on which the optimal parameter combination was obtained.Then,the flow field distribution inside the air suction chamber under different vacuum degrees or rotating speeds was analyzed using computational fluid dynamics (CFD) and FLUENT software,and a seed shape model of Chinese cabbage was established based on discrete element method (DEM).Finally,the seed metering device simulation was carried out by a simplified model and grid meshing.The comparison between bench test and simulation result showed that the air suction seed drainer performed best when the rotating speed of seed metering tray is 20 r/min and the vacuum degree of air suction chamber is 2.2 kPa.
keywords:air suction seed metering device  small seeds  discrete element method (DEM)  fluid mechanics
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