摘要
侧风是喷杆式喷雾机雾滴飘移的主要因素之一。为了分析不同侧风和风幕风速对风幕式喷杆喷雾飘移的影响规律,设计了风幕式喷杆喷雾性能测试系统,通过防飘对比试验,确定最佳风幕气流作用方式,然后进行雾滴飘移试验,得到雾滴飘移率和飘移质量中心距。结果表明:风幕气流最佳作用方式为喷杆正上方;无风幕作用时,雾滴的飘移质量中心距随侧风风速的增加线性上升;同一侧风风速下,雾滴飘移率随风幕风速的增大呈先快速再平稳减小后略有回升的趋势,风幕风速最佳的防飘区间为5~20m/s,最佳防飘风幕风速为20m/s;在同一侧风风速下,雾滴的飘移质量中心距与风幕风速呈负相关关系,风幕辅助气流有效减小飘移率的同时,对雾滴在喷头下方的分布具有显著影响。该研究可为风幕式喷杆喷雾机作业参数优化和防飘移研究提供参考。
Crosswind is the main factor causing spray drift of air-assist boom sprayer. In order to analyze the influence of different crosswind and assist airflow speed on drift in air-assist boom spray,design a drift test system on air-assist boom spray. Through the contrast experiment of anti drift test,to determine the optimal action position of assist air and the best spray pressure. Then get the droplet drift rate and drift distance from the droplet drift experiment. Experimental results show that the optimal action position of assist air is above the spray rod,the best spray pressure is 0. 5 MPa. The droplet drift distance is linearity elevation along with the increasing of crosswind speed without the assist airflow. In the same crosswind velocity,the droplet drift rate decrease rapidly at first,then decreases steadily and then rise slightly with the increase of assist air velocity. The best assit air speed interval to anti drift is 520 m/s and the optimal assit air velocity is 20 mm/s. In the same wind speed,there is a negative correlation between the droplet drift distance and assist air speed.The assist air can effectively reduce the droplet drift and has a significant impact on the distribution below the nozzle. The research can provide a reference for anti drift and parameter optimization of air-assist boom sprayer.
作者
贾卫东
申彬
周慧涛
欧鸣雄
龚辰
陈志刚
Jia Weidong;Shen Bin;Zhou Huitao;Ou Mingxiong;Gong Chen;Chen Zhigang(Key Laboratory of Modem Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang 212013 ,China)
出处
《农机化研究》
北大核心
2018年第7期62-67,共6页
Journal of Agricultural Mechanization Research
基金
国家自然科学基金项目(51475215)
"十二五"国家科技支撑计划项目(2014BAD08B04)
江苏省高校自然科学研究重大项目(13KJA210001)
江苏大学高级人才科研启动基金资助项目(14JDG030)
公益性行业(农业)科研专项(201203025-04)
关键词
风幕式喷杆喷雾
侧风
风幕风速
质量中心距
飘移率
air-assist boom sprayer
crosswind
assist air speed
drift distance
drift rate
