果园多风机风送喷雾机作业参数优化与试验

doi:10.13229/j.cnki.jdxbgxb20210309

Abstract

Abstract:

An orchard sprayer with symmetrical fans was designed to solve the problem of serious waste of liquid waste and difficulty in penetrating droplets inside the canopy of fruit trees during the operation of pest control in low anvil Close Planting Orchard. Based on the STAR-CCM+ simulation analysis of the single side flow field， the airflow rate is 4397.1 m³/h， the wind speed is 9.7 m/s， and the wind maneuver pressure is 47.3 Pa when the speed of the tractor PTO is 540 r/min. The airflow velocity reaching the outer canopy of the fruit tree is over 5.5 m/s， sufficient to reach the center of the canopy. The Box-Behnken design was adopted to optimize the combination of sprayer system parameters. The optimal parameters are obtained： the spray pressure is 0.8 MPa， the spray distance is 1.25 m， and the nozzle type if fan-shaped 02. The adhesion of chemicals onto the fruit tree canopy in the vertical direction is simulated with a vertical droplet distribution meter. Experiment results show that the variation coefficient of droplet deposition is 10%-12%， meaning the distribution of droplets is relatively uniform. Field experiments show that the total droplet deposition on the upper， middle and lower layers of the canopy in the vertical direction is 68， 145， and 195 mL， respectively， and the overall standard deviations are 1.61， 3.72， and 5.29， respectively. The number of droplets attached to the leaves is ≥70 particles/cm²， which meets the requirements of air-assisted orchard sprayer standard， offering adequate coverage of the fruit tree canopy in the vertical direction.

Key words: air blower, air assisted technology, multiple fans, spray system, CFD, box-behnken orthogonal test

CLC Number:

S224.3

Jian-ping LI,Yong-liang BIAN,Xin YANG,Peng-fei WANG,Xin-hao LI,Chun-lin XUE. Operational parameter optimization and testing of an air-assisted multi-fan orchard sprayer[J].Journal of Jilin University(Engineering and Technology Edition), 2022, 52(10): 2474-2485.

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参数	数值
挂接型式	悬挂式
动力输入	PTO
外形尺寸（长×宽×高）/ （mm×mm×mm）	1500×1030×2440
泵	隔膜泵
最大载药量/L	400
风机形式	轴流风机
风机直径/mm	500
喷嘴形式	6通道控制，环形布置
喷头数量/个	18

来源	平方和	自由度	均方	F值	p值
模型	2293.64	9	254.85	92.43	< 0.0001**
A	242.00	1	242.00	87.77	< 0.0001**
B	800.00	1	800.00	290.16	< 0.0001**
C	180.50	1	180.50	65.47	< 0.0001**
AB	100.00	1	100.00	36.27	0.0005*
AC	9.00	1	9.00	3.26	0.1138
BC	121.00	1	121.00	43.89	0.0003*
A²	227.46	1	227.46	82.50	< 0.0001**
B²	47.25	1	47.25	17.14	0.0044*
C²	495.67	1	495.67	179.78	< 0.0001**
残差	19.30	7	2.76
失拟项	12.50	3	4.17	2.45	0.2033
纯误差	6.80	4	1.70
总和	2312.94	16

Operational parameter optimization and testing of an air-assisted multi-fan orchard sprayer

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