气吹式三七精密排种器充填性能的仿真与试验
作者:
作者单位:

作者简介:

通讯作者:

基金项目:

国家自然科学基金(51305187);云南省重大科技专项(2016ZF001,2017ZF001);国家重点研发计划项目(2017YFD0700600,2017YFD0700604);云南省重大科技专项计划(2018ZC001-3,2018ZC001-4,2018ZC001-5)


Simulation and experiment of air-blowing precision seed-metering device for Panax notoginseng
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
    摘要:

    目的 为了满足三七Panax notoginseng的机械化种植需求,减少机械式清种过程中对种子造成的损伤,设计了一种适用于播种三七种子的气吹式精密排种器。方法 确定了排种器的主要结构参数,并建立了清种过程中的力学模型。通过建立排种器内部流场模型,运用Fluent软件对不同清种风压条件下流场进行仿真分析,验证了清种风压范围。为了检验仿真确定的风压范围的可行性并寻求最佳工作参数组合,选取合格指数、漏播指数和重播指数作为试验指标,作业速度、种层高度、清种风压作为试验影响因素,采用正交试验方法,对排种器进行了台架试验研究。结果 最优参数组合:作业速度为0.6 m/s、种层高度为90 mm、清种风压为0.5 kPa,此时试验合格指数为90.48,漏播指数为4.24,重播指数为5.28。结论 该气吹式排种器能够满足三七的播种要求,为进行排种器的田间试验提供了参考。通过试验结果与之前仿真分析的过程对比,清种风压变化对于排种器充填性能的影响一致,验证了利用Fluent模拟确定清种风压的可行性。

    Abstract:

    Objective A novel kind of air-blowing precision seed-metering device was designed in order to fulfill the mechanized planting needs of Panax notoginseng and reduce seed damage in the process of mechanical seeding.Method The main structural parameters of the seed-metering device were determined. The mechanical model in seed clearing process was established. The internal flow field model of the seed-metering device was established, Fluent software was used to simulate the flow field under different air-blowing pressure, and the range of air-blowing pressure for seed clearing was verified. We used orthogonal design and performed bench test to further examine the feasibility of the range of air-blowing pressure and find out the optimal combination of working parameters. Eligible index, leakage sowing index and repeat sowing index were selected as experimental indexes. Operating speed, seed layer height and air-blowing pressure were selected as the influencing factors in the test.Result The optimal combination of parameters was the operating speed of 0.6 m/s, seed layer height of 90 mm and air-blowing pressure of 0.5 kPa. Under these conditions, the qualified index was 90.48, the leakage sowing index was 4.24, and the repeat sowing index was 5.28.Conclusion The air-blowing seed-metering device can meet the requirements of Panax notoginseng seeding. This study provides a theoretical basis for the field experiment of the seed-metering device. Comparison between the test results and the simulation analysis indicates that the influence of air-blowing pressure changes on the filling performance of the seed-metering device is consistent, and Fluent simulation is feasible for determining the air-blowing pressure for seed clearing.

    参考文献
    相似文献
    引证文献
引用本文

刘素,赖庆辉,董家宇,曹秀龙.气吹式三七精密排种器充填性能的仿真与试验[J].华南农业大学学报,2019,40(3):125-132

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
历史
  • 收稿日期:2018-06-18
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期: 2019-04-23