Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (11): 3762-3773.doi: 10.13229/j.cnki.jdxbgxb.20240140

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Design and simulation analysis of orchard self-propelled mist sprayer

Sheng-xian WU(),Ke-ping ZHANG(),Jiu-xin WANG   

  1. College of Mechanical and Electrical Engineering，Gansu Agricultural University，Lanzhou 730070，China
  • Received:2024-02-03 Online:2025-11-01 Published:2026-02-03
  • Contact: Ke-ping ZHANG E-mail:1304663885@qq.com;zhangkp@gsau.edu.cn

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Abstract:

A self-propelled orchard mist spray was designed and developed to solve the problems of limited operation in low and dense orchards， difficulty in entering traditional large-scale spraying equipment， low operating efficiency and serious waste of liquid medicine. The machine adopts the form of pulse spray， improves the penetration of spray through high-speed air flow， increases canopy coverage， reduces drift， completes the design of the overall structure of the spray machine and key components such as the walking system， spray system， and fog dispersion device， and determines that the vertical spacing between the nozzles of two adjacent fog dispersion devices is 420 mm， and the included angle is 13°. The three-dimensional flow field model of spray system is established by using ANSYS Fluent software， and the Realizable k-ε And DPM particle model， the change of spray velocity， particle concentration and flow field distribution were simulated and analyzed. The field test was carried out on the operation process of the spray machine. Compared with the simulation results， the relative error of spray speed was 5.75%， the relative error of spray distance was 7.52%， and the relative error of spray height was 6.84%. The research results can provide theoretical support for the structural optimization of orchard spray.

Key words: agricultural engineering, spray machine, pulse type, flow field simulation, turbulence model

CLC Number: 

  • S491

Fig.1

Orchard self-propelled mist sprayer structure diagram"

Fig.2

Working platforms control flowchart"

Table 1

Orchard self-propelled mist sprayer main technical parameters"

参 数数值/形式
结构形式自走式（前置后驱）
车身（长×宽×高）/mm×mm×mm3 300×1 280×1 270
喷雾系统（长×宽×高）/mm×mm×mm500×1 265×1 720
整机重量/kg1 860
作业速度/（m·s-1）3~8
药箱容积/ L880
喷雾水平射程/m≥8
喷雾垂直射程/m3~12（自测）
作业模式脉冲式弥雾装置
弥雾装置数量10
单个弥雾装置耗水量/（L·h-1）60
单个弥雾装置耗油量/（L·h-1）3.6
配套动力/Hp30
工作频率/Hz1 800

Fig.3

Schematic diagram of the unilateral structure of the spraying system"

Fig.4

Schematic diagram of pulse engine structure"

Fig.5

External flow field simulation geometric model"

Fig.6

Flow field meshing and detail processing"

Fig.7

realizable k-ε turbulence model wind field velocity distribution cloud map"

Fig.8

Schematic diagram of airflow trajectory"

Fig.9

Schematic diagram of DPM particle concentration change and movement"

Fig.10

Schematic diagram of flow field distribution under spray operation in 0~10 s"

Fig.11

Schematic diagram of speed and stereoscopic measurement of sprayer"

Fig.12

Static field test of sprayer in a windless space"

Table 2

Error analysis of measured and simulated velocity values at different sampling points"

采样点现场试验/（m·s-1）仿真实验/（m·s-1）相对误差/%
137.3038.132.23
221.3221.983.10
310.4810.904.01
47.237.584.84
55.575.885.57
64.214.445.46
73.653.865.75
83.413.574.69
92.903.044.83
102.652.795.28
112.342.423.42

Fig.13

Measurements of spray distance and height under simulation and physical tests"

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