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| Research on wettability of spraying droplet with unmanned aerial vehicle |
| ZHENG Qishuai1,2, CEN Haiyan1,2, FANG Hui1,2, WU Jianjian1,2, XIAO Shupei1,2, HE Yong1,2* |
| (1. College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China; 2. Key Laboratory of Spectroscopy Sensing, Ministry of Agriculture and Rural Affairs, Hangzhou 310058, China) |
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Abstract In order to study the wettability of droplets on the leaves during aerial spraying and its influencing factors, orthogonal test and single factor test were applied to analyze the change of contact angle, which was affected by the location of leaf, foliar fertilizer type and concentration, adjuvant concentration, droplet size and instantaneous velocity. The results showed that the wettability of foliar fertilizer was effectively improved by adding adjuvants and ensuring the instantaneous velocity of the droplet at least 1.55 m/s. Liquid type and concentration, and droplet size had a certain influence on the wettability of foliar fertilizer, while the location of the leaf had no significant influence on the
wettability of foliar fertilizer. The contact angle can reach 8.5° by applying the optimal combination, that is, spraying the reverse side of leaves, high concentration of Jiaduobao foliar fertilizer, 1% adjuvant and small droplets. This study can provide references for improving the effect of agricultural aerial spraying.
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Published: 11 September 2018
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植保无人机喷施液滴润湿性探究
为研究航空喷施作业时液滴对叶片的润湿性能及其影响因素，通过正交试验和单因素试验分析了叶片位置、喷施液体种类和浓度、助剂浓度、液滴大小和接触瞬间速度等因素对液滴润湿叶片时接触角的影响。结果表明，添加助剂和保证液滴与叶片接触速度至少为1.55 m/s 能有效提高叶面肥对叶片的润湿性，液体的种类、浓度和液滴的大小对叶面肥的润湿性有一定影响，而叶片的正反面位置对叶面肥的润湿性影响并不显著。最优组合（喷施叶片反面+高浓度“稼多宝”叶面肥+1%助剂+小液滴）对应的叶面肥润湿叶片的接触角最低可达到8.5°。本研究可为提高农用航空喷施液态肥作业效果提供参考。
关键词：
无人机,
叶面肥,
喷雾,
润湿性,
接触角,
正交试验
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