摘要
提出一种具有控制充种室种子群结构的新型气力精密排种器的空气动力学原理。采用Ｋ－ε湍流模型和ＳＩＭＰＬＥ算法，预测了充种室的流场，数值计算结果和实验相附。数值预测出在充种室的不对称射流产生了一个有利于改善充种和清种的回流区。这种排种器已成功地用于精密播种机上。
This paper puts forward the aerodynamic principle of using nonsymmetrical jet for high filling seed frequency and cleaning the surplus seeds.A new type of air precision seed metering device with high filling frequency has been designed in accordance with this principle.This paper also points out the characteristics of the nonsymmetrical jet in the APSD(Air Precision Seed metering Device).The turbulence model invorks K-ε model.The numerical predictions are based SIMPLE method. Through the comparisons between the predictions and the measurements,the validity of the mathematical model is confirmed.The predictions are made out for a large recirculation zone on the APSD chamber which is available for filling and cleaning seeds.This APSD has been demonstrated to be capable of highly increasing discharge seeds frequency of the seed metering device.It has already been successfully used in the precision planter.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
1997年第3期110-114,共5页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金
国家"九五"攻关项目
关键词
精密播种机
空气动力学
排种器
Precision planter Aerodynamics Seed metering device
