ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

氣送式排種器輸種管內(nèi)種子速度耦合仿真測(cè)定與試驗(yàn)
CSTR:
作者:
作者單位:

作者簡介:

通訊作者:

中圖分類號(hào):

基金項(xiàng)目:

國家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2017YFD0700702)


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

Fund Project:

  • 摘要
  • |
  • 圖/表
  • |
  • 訪問統(tǒng)計(jì)
  • |
  • 參考文獻(xiàn)
  • |
  • 相似文獻(xiàn)
  • |
  • 引證文獻(xiàn)
  • |
  • 資源附件
  • |
  • 文章評(píng)論
    摘要:

    設(shè)計(jì)氣流輸送式排種系統(tǒng)時(shí)需確定種子速度,,以小麥種子為試驗(yàn)對(duì)象,采用計(jì)算流體動(dòng)力學(xué)和離散元耦合的方法在不同播種量與風(fēng)速情況下對(duì)輸種管內(nèi)種子速度進(jìn)行數(shù)值模擬,。采用標(biāo)準(zhǔn)k-ε模型非穩(wěn)態(tài)的Lagrangian耦合算法進(jìn)行氣固兩相流耦合仿真,,在臺(tái)架試驗(yàn)中運(yùn)用高速攝像技術(shù)對(duì)輸種管內(nèi)的種子運(yùn)動(dòng)過程進(jìn)行圖像采集,將采集的圖像進(jìn)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(dòng)距離,,并計(jì)算得到種子實(shí)際運(yùn)動(dòng)速度,。仿真模擬與試驗(yàn)表明,輸種管內(nèi)種子速度主要受風(fēng)速影響,,播種量對(duì)其影響很?。徊煌L(fēng)速下輸種管內(nèi)種子速度仿真值與試驗(yàn)值的相對(duì)誤差范圍為4.28%~6.06%,,相同位置處不同風(fēng)速種子速度仿真值與試驗(yàn)值的相對(duì)誤差范圍為4.86%~5.70%,,通過計(jì)算得到輸種管內(nèi)種子速度的修正系數(shù)平均值為0.95?;跉夤虄上嗔黢詈系妮敺N管內(nèi)種子速度仿真具有較高的準(zhǔn)確度,,驗(yàn)證了基于EDEM-Fluent耦合仿真測(cè)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.

    參考文獻(xiàn)
    相似文獻(xiàn)
    引證文獻(xiàn)
引用本文

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(cè)定與試驗(yàn)[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),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.

復(fù)制
分享
文章指標(biāo)
  • 點(diǎn)擊次數(shù):
  • 下載次數(shù):
  • HTML閱讀次數(shù):
  • 引用次數(shù):
歷史
  • 收稿日期:2020-12-21
  • 最后修改日期:
  • 錄用日期:
  • 在線發(fā)布日期: 2021-04-10
  • 出版日期: 2021-04-10
文章二維碼