| 侧风影响下喷头倾斜角度对雾滴飘移补偿 |
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| 引用本文： | 孙道宗,占旭锐,刘伟康,薛秀云,谢家兴,李震,宋淑然,王卫星.侧风影响下喷头倾斜角度对雾滴飘移补偿[J].农业工程学报,2021,37(21):80-89. |
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| 作者姓名： | 孙道宗 占旭锐 刘伟康 薛秀云 谢家兴 李震 宋淑然 王卫星 |
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| 作者单位： | 1.华南农业大学电子工程学院/人工智能学院，广州 510642；3. 广东省农情信息监测工程技术研究中心，广州 510642;1. 华南农业大学电子工程学院/人工智能学院，广州 510642； 2. 国家柑橘产业技术体系机械研究室，广州 510642；3. 广东省农情信息监测工程技术研究中心，广州 510642； 4. 广东省山地果园机械创新工程技术研究中心，广州 510642 |
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| 基金项目： | 国家自然科学基金项目（31671591，31971797）；广东省现代农业产业技术体系创新团队建设专项资金（2020KJ108）；广州市科技计划项目（202002030245）；财政部和农业农村部：国家现代农业产业技术体系资助；广东省教育厅特色创新类项目（2019KTSCX013）；大学生创新创业训练计划项目（201910564147） |
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| 摘 要： | 为研究植保喷雾作业中在不同风速和喷头倾斜角度下对水平喷雾的雾滴飘移的影响，设置3个风速水平（1、2、3 m/s）与4个喷头倾斜角度水平（0°、15°、30°、45°）进行喷雾试验，测定了不同水平的雾滴分布，以风速为0、喷头倾斜角度为0°的常规作业水平作为对照组，对垂直和水平两个方向的雾滴质量分布中心与变异系数进行分析。结果表明，垂直方向上，侧风风速与喷头倾斜角度对垂直雾滴质量分布中心的影响在±3 cm范围内整体影响较小，而侧风风速与喷头倾斜角度的增大都会使垂直方向变异系数减小，在1～3 m/s的风速下垂直方向变异系数减小的最大值分别为12.3、6.0、16.0个百分点，提高了雾滴在垂直方向上的均匀性。水平方向上，不同风速和喷头倾斜角度都会对雾滴飘移产生影响，随着喷头倾斜角度的增大，雾滴受风速的影响程度会减小，当喷头倾斜角的补偿量超过了当前风速下对雾滴的飘移量，会使雾滴飘移产生过补偿，在高风速时喷头倾斜角度的改变会带来更大的雾滴飘移改变。侧风风速与喷头倾斜角度对水平方向上变异系数会产生较大影响：随着喷头倾斜角度的增大，水平变异系数也随之增大，而风速的变化使水平变异系数呈现先增大后减小的趋势。拟合了喷头倾斜角度与风速对雾滴飘移的影响模型，并计算出在1、2、3 m/s风速条件下，最佳补偿的喷头倾斜角度分别为3°、7°、11°。该研究为植保作业中雾滴飘移改善技术提供参考。
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| 关 键 词： | 喷雾 喷头倾斜角度 飘移补偿 雾滴分布 |
| 收稿时间： | 2021/8/11 0:00:00 |
| 修稿时间： | 2021/10/30 0:00:00 |
Compensation of spray angle to droplet drift under crosswind |
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| Sun Daozong,Zhan Xurui,Liu Weikang,Xue Xiuyun,Xie Jiaxing,Li Zhen,Song Shuran,Wang Weixing.Compensation of spray angle to droplet drift under crosswind[J].Transactions of the Chinese Society of Agricultural Engineering,2021,37(21):80-89. |
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| Authors: | Sun Daozong Zhan Xurui Liu Weikang Xue Xiuyun Xie Jiaxing Li Zhen Song Shuran Wang Weixing |
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| Institution: | 1.College of Electronic Engineering / Artificial Intelligence, South China Agricultural University, Guangzhou 510642, China;3. Guangdong Engineering Research Center for Monitoring Agricultural Information, Guangzhou 510642, China;;1.College of Electronic Engineering / Artificial Intelligence, South China Agricultural University, Guangzhou 510642, China;2. Division of Citrus Machinery, China Agriculture Research System, Guangzhou 510642, China;3. Guangdong Engineering Research Center for Monitoring Agricultural Information, Guangzhou 510642, China;4. Guangdong Engineering Technology Research Center for Mountainous Orchard Machinery, Guangzhou 510642, China |
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| Abstract: | Abstract: This study aims to explore the effects of side spray in the plant protection spraying on the droplet drift under different wind speeds and nozzle tilt angles. A sprayed test was performed on the three wind speed levels (1, 2, and 3 m/s), and four nozzle tilt angles (0°, 15°, 30°, and 45°). The droplet distribution was also measured under different levels. The control group was also set as a wind speed of 0m/s, and the nozzle tilt angle of 0°. The mass distribution center of droplet and the coefficient of variation were then determined in the vertical and horizontal directions. The results show that there was a relatively small influence of crosswind wind speed and nozzle tilt angle on the droplet mass distribution center in the range of ±3 cm in the vertical direction. Specifically, the increase of crosswind wind speed and nozzle tilt angle caused the new variation in the vertical direction. The maximum decrease of coefficient of variation in vertical direction at 1-3 m/s wind speed is 12.3, 6.0 and 16.0 percentage points respectively. By contrast, there was a greatly different influence of the wind speeds and nozzle tilt angles on the droplet drift in the horizontal direction. The influence of the fog droplets on the wind speed decreased, as the tilt angle of the nozzle increased toward the negative direction of the wind speed. The fog droplets drifted excessively, when the compensation amount of the nozzle tilt angle exceeded the drift amount of the fog droplets under the current wind speed. The tilt angle of the nozzle at high wind speeds was greatly contributed to a greater change in the droplet drift. The speed of crosswind wind and the tilt angle of the nozzle presented a greater impact on the coefficient of variation in the horizontal direction. Furthermore, the horizontal coefficient of variation increased, whereas, the change of wind speed caused the horizontal coefficient of variation to increase first and then decrease, as the tilt angle of the nozzle increased. Consequently, the best compensated nozzle tilt angles were 3°, 7° and 11° under the conditions of 1, 2, and 3 m/s. This finding can provide a strong reference for the improvement technology of droplet drift in plant protection spraying. |
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| Keywords: | spray nozzle tilt angle drift compensation droplet distribution |
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