4LZ-0.8型水稻联合收割机清选装置气固两相分离作业机理
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脱粒条件下的经济的清选...
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Published in | 农业工程学报 Vol. 31; no. 12; pp. 16 - 22 |
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Main Author | |
Format | Journal Article |
Language | Chinese |
Published |
湖南农业大学工学院,长沙 410128
2015
南方粮油作物协同创新中心,长沙 410128%湖南农广农业装备有限公司,娄底,417700 湖南省现代农业装备工程技术研究中心,长沙 410128 南方粮油作物协同创新中心,长沙 410128%湖南农业大学工学院,长沙 410128 |
Subjects | |
Online Access | Get full text |
ISSN | 1002-6819 |
DOI | 10.11975/j.issn.1002-6819.2015.12.003 |
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Summary: | 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脱粒条件下的经济的清选气流速度9.2 m/s,压力损失为630 Pa。该研究为4LZ-0.8型水稻联合收割机脱粒清选部件的参数优化设计及风机的选择提供了理论依据。 |
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Bibliography: | 11-2047/S 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 with air velocity is obtained.The pressure loss in the air and debris flow in shunt tube is analyzed,and the most economical cleaning air velocity under a certain mass flow is calculated.All of these provide a theoretical basis for the parameter design of 4LZ-0.8 type of rice combine harvester's threshing cleaning parts.Material in the flow field is subjected to aerodynamic drag and the role of its own gravity which are related to the size of the pneumatic resistan |
ISSN: | 1002-6819 |
DOI: | 10.11975/j.issn.1002-6819.2015.12.003 |