| 摘要: |
| 以吸盘式精密播种装置为研究对象,应用CFD技术数值模拟吸种盘不同吸孔直径、气源真空度和气吸室形状下气力吸种部件内气流的压力场,并进行试验验证。仿真结果表明:较大的吸孔直径可提高吸种能力,但气吸室内压力呈不均匀分布趋势,影响吸种性能;较大的气源真空度有利于提高吸种能力,且不影响气吸室流场的均匀分布;气吸室形状对吸种能力和吸种均匀性均不造成影响。试验分析与仿真分析结果一致。对于自制吸盘式精密播种装置,播种水稻种子时吸种盘上吸孔孔径2.0 mm左右、真空度为6.7~15.0 kPa时具有较好的吸种效果。 |
| 关键词: 吸盘 精密播种装置 气力吸种部件 CFD |
| DOI：10.11841/j.issn.1007-4333.2010.01.021 |
| 投稿时间：2009-04-09 |
| 基金项目:国家"十一五"科技支撑项目(2006BDA28B00-05)第一作者:刘彩玲,副教授,博士研究生,E-mail:cailingliu@163.com通讯作者:宋建农,教授,博士生导师,主要从事农业装备工程研究,E-mail:songjn@cau.edu.cn |
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| Analysis of flow field simulation on vacuum seed-metering components of precision metering device with sucker |
|
LIU Cai-ling, SONG Jian-nong, WANG Ji-cheng, WANG Chong
|
| (College of Engineering,China Agricultural University, Beijing 100083, China) |
| Abstract: |
| The study object was precision metering device with sucker and the pressure field of vacuum seed-metering components was simulated under the different nozzle diameters of the sucker and the vacuum-pressures from different gas sources and the chamber shapes by CFD technique. The simulation results were verified by the experiments and showed that the larger pickup hole diameter could improve the vacuum ability, but it might cause an uneven pressure distribution in chamber and weakened the performance of seeds picking-up; however, the higher vacuum-pressure could enhance vacuum performance and the distribution of the chamber pressure had not affected. The chamber shape had no any influence on vacuum performance and pressure distribution in chamber. The results from simulation and experiments are consistent. When the pickup hole of sucker is 2 mm in diameter and the pickup vacuum is between 6.7-15 kPa, the picking performance of the self-made rice sucker precision metering device is well. |
| Key words: sucker precision metering device vacuum seed-metering components CFD |
