农业机械学报2017，Vol.48Issue(3)：57-68,12.DOI:10.6041/j.issn.1000-1298.2017.03.007
油麦兼用气送式集排器输种管道气固两相流仿真与试验
Simulation and Experiment of Gas-Solid Flow in Seed Conveying Tube for Rapeseed and Wheat
摘要
Abstract
In order to study seed movement law of seed conveying tube of air-assisted centralized metering device for rapeseed and wheat,effects of seed conveying tube's diameter and length,ration of lateral length to longitudinal length (k),and joint's type on seed motion characteristics and airflow field were analyzed with EDEM-CFD coupling approach.Impact of seed conveying tube's structure on seeding performance was studied by bench experiments.The results showed that seed movement direction which was the same as airflow direction in seed conveying tube was in axis direction and seed motion source was the drag force.The seed velocity in seed conveying tube's outlet was increased first and then decreased with the increase of ratio of lateral length to longitudinal length (k).The each row's averaged seeding quantity and apiece row consistency variation coefficient of seeding quantity were affected significantly by seed conveying tube's structure.When seed conveying tube's diameter,length and k was 42 mm,1.0 m and 2/3,respectively,seed velocity,relative velocity between particle and airflow and seed distribution were good with lower pressure loss and better seeding performance.Seed velocity of conveying tube with bends was larger than that of conveying tube with mansard joint.The relative velocity of conveying tube with bends was lower than that of conveying tube with mansard joint.Airflow field and seed distribution was uniform with larger seed velocity and lower pressure loss in conveying tube with bends of 100 mm of radius.When rotational speed of seed feed device was within the range of 10 ～40 r/min,apiece row consistency variation coefficient of seeding quantity of rapeseed and wheat was less than 4.0％ and 5.0％,respectively.The stability of full seeding quantity and seed damage rate were no more than 1.0％ and 0.1％,respectively,for both rapeseed and wheat.The results provided the basis for structure optimization of air-assisted centralized metering system and improvement of seeding performance.关键词
油菜/小麦/气送式集排器/输种管道/气固两相流/排种性能Key words
rapeseed/wheat/air-assisted centralized metering device/seed conveying tube/gas-solid flow/seeding performance分类
农业科技引用本文复制引用
雷小龙,廖宜涛,张闻宇,李姗姗,王都,廖庆喜..油麦兼用气送式集排器输种管道气固两相流仿真与试验[J].农业机械学报,2017,48(3):57-68,12.基金项目
国家自然科学基金项目(51575218、51275197)、国家油菜产业体系专项(CARS-13)、湖北省技术创新专项(2016ABA094)和“十二五”国家科技支撑计划项目(2013BAD08B02) （51575218、51275197）
