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Effects of technical operation parameters on spray characteristics of rotor plant protection UAV
Zhu Hang, Li Hongze, Huang Yu, Yu Haitao, Dong Yunzhe, Li Junxing
Effects of technical operation parameters on spray characteristics of rotor plant protection UAV
High-quality operation of plant protection UAV is the premise of precision operation in agricultural aviation, so it is particularly important to study the characteristics of spray system. In order to explore the factors that affect the spray quality, the comprehensive experimental platform of spray performance (developed by Jilin Agricultural Machinery Research Institute) was used to test the droplet deposition distribution and droplet diameter under different UAV rotor speed, spray height and centrifugal nozzle speed in this research, and regression analysis on the deposition characteristics and particle diameter data of 12 groups of tests was conducted. The results showed that the three repeated tests of the same set of parameters had good consistency. Droplets had obvious drift and the maximum effective deposition rate was 46.31% and minimum 31.74%, which shows that the effective deposition rate of droplets was lower than 50%. Compared with the regression analysis results of droplet diameters DV10, DV50 and DV90, the spray height P value is greater than 0.5, and the nozzle speed and rotor speed P value are less than 0.5. So it can be inferred that spray height had a very significant effect on deposition, no significant effect on droplet size. The nozzle speed and rotor speed had very significant effect on droplet size, no significant effect on deposition. The test results of this research can provide theoretical basis and data support for improving the operation quality and spraying efficiency of UAVs.
plant protection UAV / spray quality / experimental platform of droplet collection / laser particle size analyzer / centrifugal nozzle {{custom_keyword}} /
Table 1 Parameters of variates表1 变量参数 |
旋翼转速(r/min) | 喷雾高度 (m) | 喷头转速 (r/min) |
---|---|---|
3850 | 1 | 9150 |
11100 | ||
5050 | 2 | 12000 |
Table 2 Total variates表2 总体变量表 |
旋翼转速(r/min) | 3850 | 5050 | |||||
---|---|---|---|---|---|---|---|
喷头转速(r/min) 高度(m) | 9150 | 11100 | 12000 | 9150 | 11100 | 12000 | |
1 | A11 | A12 | A13 | A21 | A22 | A23 | |
2 | B11 | B12 | B13 | B21 | B22 | B23 |
变量说明: ①A和B代表不同喷雾高度的两个水平,即A代表1m,B代表2m; ②字母后的第一位数字1和2代表旋翼转速的两个水平,即1代表3850r/min,2代表5050r/min; ③最后一位数字1,2和3代表喷头转速的三个水平,即1代表9150r/min,2代表11100r/min,3代表12000r/min. |
Table3 Deposition characteristics of each group表3 各组别沉积特性 |
组别 | 理论沉积量(ml) | 有效沉积量(ml) | 有效沉积率(%) | 变异系数(%) |
---|---|---|---|---|
A11 | 3100 | 1085.2±490.7 | 35.0±15.8 | 41.5±8.0 |
A12 | 3100 | 1198.3±133.9 | 38.7±4.3 | 38.0±3.3 |
A13 | 3100 | 1116.2±160.1 | 36.0±5.2 | 41.8±4.3 |
A21 | 3100 | 983.8±137.6 | 31.7±4.4 | 42.2±4.9 |
A22 | 3100 | 1435.5±52.5 | 46.3±1.9 | 41.3±1.6 |
A23 | 3100 | 1237.4±207.1 | 39.9±5.5 | 41.9±1.0 |
B11 | 3100 | 1253.3±348.4 | 40.4±9.4 | 43.7±6.6 |
B12 | 3100 | 1043.3±195.9 | 33.7±6.7 | 46.9±2.4 |
B13 | 3100 | 1271.0±184.2 | 41.0±4.8 | 45.8±3.6 |
B21 | 3100 | 1172.6±255.9 | 37.8±0.9 | 48.0±1.9 |
B22 | 3100 | 1207.0±275.5 | 38.9±8.8 | 46.2±3.3 |
B23 | 3100 | 1201.1±196.6 | 38.75±6.3 | 45.3±3.3 |
Table 4 Droplet diameters of each group表4 各组别雾滴粒径 |
组别 | DV10(μm) | DV50(μm) | DV90(μm) | R.S. |
---|---|---|---|---|
A11 | 89.45 | 132.9 | 205.5 | 0.67 |
A12 | 78.08 | 132.4 | 189.4 | 0.64 |
A13 | 79.89 | 133 | 193.8 | 0.66 |
A21 | 80.79 | 137 | 197.2 | 0.66 |
A22 | 81.96 | 136.9 | 201 | 0.69 |
A23 | 74.43 | 125.6 | 183.6 | 0.78 |
B11 | 81.34 | 135.5 | 192.9 | 0.91 |
B12 | 78.28 | 133.2 | 191.1 | 0.86 |
B13 | 76.15 | 132 | 189.5 | 0.84 |
B21 | 73.67 | 129.9 | 187.5 | 0.88 |
B22 | 73.35 | 125.2 | 176.1 | 0.82 |
B23 | 72.82 | 126.2 | 180.8 | 0.86 |
Table 5 Correlations between different spray heights, nozzle speeds and rotor speeds and droplet deposition表5 喷雾高度、喷头转速、旋翼转速与雾滴沉积的相关分析(α =0.05) |
差异源 | 喷雾高度 | 喷头转速 | 旋翼转速 |
---|---|---|---|
相关系数 | 0.455 | 0.114 | 0.131 |
P值 | 0.014 | 0.198 | 0.294 |
Table 6 Correlations between different spray heights, nozzle speeds and rotor speeds and droplet sizes表6 喷雾高度、喷头转速、旋翼转速与雾滴粒径的相关分析(α=0.05) |
差异源 | 喷雾高度 | 喷头转速 | 旋翼转速 |
---|---|---|---|
相关系数 | 0.001 | 0.391 | 0.106 |
P值 | 0.925 | 0.008 | 0.041 |
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