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当前位置: 首页 > 文章 > 贯流风筛清选装置内玉米脱出物运动规律研究 农业机械学报 2015,46 (9) 122-127
Position: Home > Articles > Motion Law of Maize Mixture in Cross Air-and-screen Cleaning Device Transactions of the Chinese Society for Agricultural Machinery 2015,46 (9) 122-127

贯流风筛清选装置内玉米脱出物运动规律研究

作  者：
王立军;李洋;梁昌;马继卿;周文秀
单  位：
东北农业大学工程学院
关键词：
玉米籽粒收获机;贯流式风筛;玉米脱出物;运动规律
摘  要：
为减少玉米籽粒收获机作业时籽粒清选损失率,利用EDEM建立了玉米脱出物各成分颗粒模型,采用CFDDEM耦合的方法对玉米脱出物在贯流式风筛清选装置中的运动进行了数值模拟。仿真结果表明,透筛杂质为玉米芯且集中在清选装置后部;随着清选装置入口气体速度的提高清选装置清选获得的籽粒清洁率提高,但玉米籽粒清选损失率增加,仿真结果与台架试验结果基本一致。在玉米脱出物喂入量3 kg/s条件下,研究确定清选装置入口气体速度低于11.72 m/s,清选装置清选损失率小于2%,符合玉米籽粒联合收获机正常作业性能要求。
译  名：
Motion Law of Maize Mixture in Cross Air-and-screen Cleaning Device
作  者：
Wang Lijun;Li Yang;Liang Chang;Ma Jiqing;Zhou Wenxiu;College of Engineering,Northeast Agricultural University;
关键词：
Maize threshing harvester Cross air-and-screen Maize mixture Motion law
摘  要：
In view of the loss of maize cleaned out of maize harvester,models of maize mixture were founded by using EDEM software. Computational fluid dynamics and discrete element method( CFD-DEM) were coupled to simulate the motion of maize in cross air-and-screen cleaning device. The distribution of airflow and the trajectories and velocities of maize moving in the device were obtained,which reveal the work mechanism of the device. The results also showed that the debris of maize only included maize cob and main concentrated in the middle and at the rear of the device. And the performance of the device cleaning debris was enhanced with rises of inlet airflow velocities in the device,but the loss of maize was increased. The experimental results and simulation results consisted well. In order to meet the performance requirement of maize harvester,the loss rate of maize should be lower than2%,the inlet velocity of airflow was ascertained and should be lower than 11. 72 m / s under the condition of the normal feed quantity of maize mixture of 3 kg / s. Based on this,the rotating speed of the cross fan in maize harvester should be lower than 911 r / min.

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