| Simulated analysis and test of air\|screen cleaning device for flax based on CFD-DEM coupling |
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| DOI：10.7606/j.issn.1000-7601.2023.06.30 |
| Key Words: separation and cleaning device flax combine harvester simulation test parameter optimization CFD-DEM |
| Author Name | Affiliation | | YUAN Zixiang | College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | DAI Fei | College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHAO Wuyun | College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | SHI Ruijie | College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHAO Yiming | College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | XIN Shanglong | College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| In order to study the real screening effect of flax threshing materials on the vibrating screen, the CFD-DEM coupling method was used in this study to examine the cleaning effects of flax threshing materials in the air and screen cleaning device of the flax combine harvester and to explore the influence of the opening angle of the scale screen, the air velocity, the vibration frequency of the cleaning screen and the amplitude of the cleaning screen on the cleaning effect to measure the working performance of the separation and cleaning device under different working parameters. The simulation test results showed that the optimal opening angle of the chaffer was 30°, the sieving rate of the chaffer was 79.77%, the sieving rate of the stem was 65.52%, and the sieving rate of the grain was 90.01%. The optimum vibrating amplitude of the vibrating screen was 15 mm, the loss rate of flax seed was 3.6%, and the impurity content of flax seed was 3.4%. The optimum vibrating frequency of the vibrating screen was 6 Hz, the cleaning loss rate was 3.5%, and the impurity content of the grain was 3.4%. The optimal wind speed of the fan was 5.5 m·s-1, the grain impurity content was 3.2%, and the cleaning loss rate was 3.0%. The field operation performance verification test was carried out based on the optimized working parameters. According to the test indicators of the collected materials after the machine harvest, the total cleaning loss rate was 3.58%, and the grain impurity content rate was 3.16%. The field test results were basically consistent with the simulation results. After mechanical harvesting, the shape of flax seeds was complete, the damage phenomenon was less, and the impurity content and total loss rate met the requirements of relevant test standards. The results showed that the optimized parameters met the requirements of flax combined harvesting standards. |
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