Optimization design and experiment of air transmission system of multi‑duct orchard sprayer

doi:10.13733/j.jcam.issn.2095‑5553.2024.11.012

Abstract

Abstract: Aiming at the problems of serious waste of chemical liquid and the low amount of deposition on the canopy of fruit trees, a kind of air transmission system for orchard multi‑duct sprayer was designed. According to the planting mode of apple orchard and fruit tree growth state in China, the air volume and wind pressure of the centrifugal fan were determined, and the external airflow of the sprayer was simulated based on the Fluent software, the influence of the duct structure of the fan at the air outlet on the distribution characteristics of the airflow field was analyzed, and the optimal structural parameters of the fan were found, and were verified by experiment. The test results show that the significance of the influence of wind turbine structural parameters on wind speed is from large to small, including fan length, outer wall inclination angle, and number of guide vanes. When the length of the fan pipe is 350 mm, the inclination angle of the outer wall is -4°, and the number of guide vanes is 6, the external airflow velocity and uniformity of the air conveying system reach the best. The droplet penetration test shows that the droplet deposition density installed at the spray outlet is 14.94%, 23.7% and 26.6%, respectively higher than that of the outside, middle and inner layers of fruit trees without the dryer. The result shows that the air conveyor system of multi‑channel orchard sprayer has a reasonable structure to meet the needs of orchard plant protection machinery.

Key words: air transmission system, computational fluid dynamics, spray flow field, spraying machinery

摘要： 针对果园传统风送式喷雾机药液浪费严重、在果树冠层上沉积量较少的问题，设计一种果园多风道喷雾机风送系统。根据我国苹果园种植模式及果树生长状态确定离心风机的风量及风压，基于Fluent软件对喷雾机外部气流进行模拟研究，分析出风口处风筒结构对气流场分布特性的影响，寻找风筒最佳结构参数，并通过试验进行验证。试验结果表明：风筒结构参数对风速影响的显著性由大到小为风筒长度、外壁倾角、导叶数量；当风筒长度为350 mm、外壁倾角为-4°、导叶数量为6时，风送系统外部气流速度及均匀性达到最优。经雾滴穿透性试验表明，与无风筒相比，在有风筒条件下，果树冠层外、中、内处的雾滴沉积密度分别提升14.94%、23.7%、26.6%。表明多风道果园喷雾机风送系统结构合理，满足果园植保机械需求。

关键词: 风送系统, 计算流体力学, 喷雾流场, 喷雾机械

CLC Number:

S491

Liu Zhaoguang, Li Yaqin, Zhao Huanmin, Pu Yanyan, Qiu Xinwei, Fu Yanwei. Optimization design and experiment of air transmission system of multi‑duct orchard sprayer[J]. Journal of Chinese Agricultural Mechanization, 2024, 45(11): 77-82.

刘兆光, 李亚芹, 赵浣旻, 蒲岩岩, 邱新伟, 付彦伟. 多风道果园喷雾机风送系统优化设计与试验[J]. 中国农机化学报, 2024, 45(11): 77-82.

References

[ 1 ] 邱威, 孙浩, 孙玉慧, 等. 低矮果园环流式循环风送喷雾机设计与试验[J]. 农业工程学报, 2021, 37(6): 18-25.
Qiu Wei, Sun Hao, Sun Yuhui, et al. Design and test of circulating air‑assisted sprayer for dwarfed orchard [J]. Transactions of the Chinese Society of Agricultural Engineering, 2021, 37(6): 18-25.
[ 2 ] 翟长远, 赵春江, Ning Wang, 等. 果园风送喷雾精准控制方法研究进展[J]. 农业工程学报, 2018, 34(10): 1-15.
Zhai Changyuan, Zhao Chunjiang, Ning Wang, et al. Research progress on precision control methods of air‑assisted spraying in orchards [J]. Transactions of the Chinese Society of Agricultural Engineering, 2018, 34(10): 1-15.
[ 3 ] 马亚坤. 果园风送喷雾机雾滴沉积状态预测研究[D]. 广州: 华南农业大学, 2016.
[ 4 ] 丁素明, 傅锡敏, 薛新宇, 等. 低矮果园自走式风送喷雾机研制与试验[J]. 农业工程学报, 2013, 29(15): 18-25.
Ding Suming, Fu Ximin, Xue Xinyu, et al. Design and experiment of self‑propelled air‑assisted sprayer in orchard with dwarf culture [J]. Transactions of the Chinese Society of Agricultural Engineering, 2013, 29(15): 18-25.
[ 5 ] 刘玉肖, 杨欣, 边永亮, 等. 果园风送喷雾机蝶型导流结构设计仿真与试验[J]. 河北农业大学学报, 2023, 46(2): 103-109.
[ 6 ] 姜红花, 牛成强, 刘理民, 等. 果园多风管风送喷雾机风量调控系统设计与试验[J]. 农业机械学报, 2020, 51(S2): 298-307.
Jiang Honghua, Niu Chengqiang, Liu Limin, et al. Design and experiment of air volume control system of orchard multi‑pipe air sprayer [J]. Transactions of the Chinese Society for Agricultural Machinery, 2020, 51(S2): 298-307.
[ 7 ] 边永亮, 杜亚光, 李建平, 等. 风机及导流装置在果园植保中的应用与前景分析[J]. 现代农业装备, 2020, 41(6): 17-24.
[ 8 ] 杨欣, 刘玉肖, 王阳, 等. 果园多风管喷雾机风送系统CFD仿真与试验[J/OL]. 吉林大学学报(工学版): 1-9[2023-06-28]. http: //kns. cnki. net/kcms/detail/22. 1341. T. 20230327. 0939. 006. html.
[ 9 ] 翟长远, 张燕妮, 窦汉杰, 等. 果园风送喷雾机出风口风场CFD建模与试验[J]. 智慧农业(中英文), 2021, 3(3): 70-81.
Zhai Changyuan, Zhang Yanni, Dou Hanjie, et al. CFD modeling and experiment of air‐ flow at the air outlet of orchard air‑assisted sprayer [J]. Smart Agriculture, 2021, 3(3): 70-81.
[10] Dekeyser D, Duga A T, Verboven P, et al. Assessment of orchard sprayers using laboratory experiments and computational fluid dynamics modeling [J]. Biosystems Engineering, 2013, 114(2): 157-169.
[11] Endalew A M, Debaer C, Rutten N, et al. A new integrated CFD modelling approach towards air‑assisted orchard spraying. Part I. Model development and effect of wind speed and direction on sprayer airflow [J]. Computers and Electronics in Agriculture, 2010, 71(2): 128-136.
[12] Endalew A M, Debaer C, Rutten N, et al. A new integrated CFD modelling approach towards air‑assisted orchard spraying—Part II: Validation for different sprayer types [J]. Computers and Electronics in Agriculture, 2010, 71(2): 137-147.
[13] Badules J, Vidal M, Boné A, et al. Comparative study of CFD models of the air flow produced by an air‑assisted sprayer adapted to the crop geometry [J]. Computers and Electronics in Agriculture, 2018, 149: 166-174.
[14] 郭江鹏, 王鹏飞, 李昕昊, 等. 果园多风道喷雾机送风系统设计优化与试验[J]. 智慧农业(中英文), 2022, 4(3): 75-85.
Guo Jiangpeng, Wang Pengfei, Li Xinhao, et al. Design optimization and test of air supply system for multi‑duct sprayer [J]. Smart Agriculture, 2022, 4(3): 75-85.
[15] 王杰. 苗木对靶喷雾机风送系统设计及流场分析[D]. 南京: 南京林业大学, 2018.
[16] 吴敏敏. 多风道果园风送喷雾系统设计仿真与试验研究[D]. 镇江: 江苏大学, 2021.
[17] 柳接太. 苹果园管理技术新变化和技术原则[J]. 北京农业, 2015(24): 40-41.
[18] 戴奋奋. 风送喷雾机风量的选择与计算[J]. 植物保护, 2008(6): 124-127.
[19] 李昕昊, 王鹏飞, 李建平, 等. 果园多风道风送喷雾机送风机构模拟分析与试验[J]. 河北农业大学学报, 2021, 44(2): 122-127, 141.

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