期刊论文

Xie, Fangping

中文

农业工程学报

1002-6819

2015

31

12

16-22

10.11975/j.issn.1002-6819.2015.12.003

湖南省战略性新型产业科技攻关计划（2014GK1056）；

本校为第一且通讯机构

为解决小型水稻联合收割机脱净率和损失率问题,提高脱粒清选质量,利用两相流动力学理论,分析了4LZ-0.8型水稻联合收割机脱粒清选分流筒中气流和杂物颗粒两相流动的规律。建立了杂物颗粒流的运动微分方程,导出了分离筒中杂物漂浮速度计算的一种方法,通过比较不同粒径、密度的物料的悬浮速度,得到了杂物颗粒最高速度与气流速度之比随气流速度变化的关系曲线,气流和杂物在分流筒及吸风管中运动时的压力损失随气流速度变化呈现先降后升的规律,压力损失中以加速损失和摩擦损失为主,各约占30%和26%。压力损失曲线存在最小值,此时的气流速度定义为经济气流速度。在喂入量为0.8 kg/s,谷草比为3:1脱粒条件...

Using the theory of two-phase flow dynamics, the law of two-phase flow formed by airflow and sundry grain in the threshing cleaning shunt tube of the 4LZ-0.8 type of rice combine harvester is studied in this paper. The movement differential equation of sundry grain flow is established and the sundry suspension speed is deduced. A method for calculating the suspension velocities of the particles with different sizes and densities is analyzed in the paper. The curve of the ratio of the highest sundry particle velocity to the air velocity varying ...