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氣送式排種器輸種管內(nèi)種子速度耦合仿真測定與試驗
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國家重點研發(fā)計劃項目(2017YFD0700702)


Simulation and Test of Seed Velocity Coupling in Seed Tube of Pneumutic Seed Metering Device
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    摘要:

    設計氣流輸送式排種系統(tǒng)時需確定種子速度,,以小麥種子為試驗對象,,采用計算流體動力學和離散元耦合的方法在不同播種量與風速情況下對輸種管內(nèi)種子速度進行數(shù)值模擬。采用標準k-ε模型非穩(wěn)態(tài)的Lagrangian耦合算法進行氣固兩相流耦合仿真,,在臺架試驗中運用高速攝像技術對輸種管內(nèi)的種子運動過程進行圖像采集,,將采集的圖像進行二值化、反色,、差分,、腐蝕去噪聲等圖像處理,根據(jù)種子面積與質(zhì)心位置特征提取種子的移動距離,,并計算得到種子實際運動速度,。仿真模擬與試驗表明,輸種管內(nèi)種子速度主要受風速影響,,播種量對其影響很?。徊煌L速下輸種管內(nèi)種子速度仿真值與試驗值的相對誤差范圍為4.28%~6.06%,相同位置處不同風速種子速度仿真值與試驗值的相對誤差范圍為4.86%~5.70%,,通過計算得到輸種管內(nèi)種子速度的修正系數(shù)平均值為0.95,。基于氣固兩相流耦合的輸種管內(nèi)種子速度仿真具有較高的準確度,,驗證了基于EDEM-Fluent耦合仿真測定輸種管內(nèi)種子速度的可行性,。

    Abstract:

    For the design of the pneumatic conveyor type metering system, wheat seeds were taken as test object to provide a reference basis, and through the calculation on the fluid dynamics and the coupling of the discrete element method to make numerical simulation. The standard k-εmodel of unsteady coupling Lagrangian algorithm coupling simulation was used to simulate the gas-solid two-phase flow. The high-speed camera technology was used to capture images of the seed movement process in the seed tube for the experiment. The collected image was processed by binaryzation, color inversion, differential and corrosion and processing. The seed movement distance was extracted according to the characteristics of the seed area and the position of the center of mass, and the actual movement speed of the seed was calculated. The simulation and test results showed that the seed velocity in the seed tube was mainly affected by the wind speed, but the seed application rate had little influence. The relative error range between the simulated and experimental values of seed velocity at different wind speeds was 4.28%~6.06%, and the ratio of simulation test results to real test results was approximately constant, which was supposed to be due to the influence of seed sphericity on movement speed. The results showed that the correction coefficient of the seed velocity in the seed tube was 0.95. Therefore, the simulation test of seed velocity through fluid solid coupling simulation had a high accuracy,which verified the feasibility of the method of measuring the seed velocity of the seed tube based on EDEM-Fluent gas-solid two-phase flow coupling simulation. The research can provide a new method for measuring the seed velocity in the seed tube.

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李衍軍,劉瑞,劉春曉,劉立晶.氣送式排種器輸種管內(nèi)種子速度耦合仿真測定與試驗[J].農(nóng)業(yè)機械學報,2021,52(4):54-61,,133. LI Yanjun, LIU Rui, LIU Chunxiao, LIU Lijing. Simulation and Test of Seed Velocity Coupling in Seed Tube of Pneumutic Seed Metering Device[J]. Transactions of the Chinese Society for Agricultural Machinery,2021,52(4):54-61,,133.

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  • 收稿日期:2020-12-21
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  • 在線發(fā)布日期: 2021-04-10
  • 出版日期: 2021-04-10
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