摘要
研究农药雾滴的空间运行规律及其影响因素,对减少飘移、保护环境及助剂开发都有重要意义。选取2%甲氨基阿维菌素苯甲酸盐(简称甲维盐)乳油,采用Euler-Lagrange离散相模型对雾滴空间运行过程进行数值模拟,分析了农药雾滴的空间运行轨迹。结果表明:黏度和表面张力对雾滴空间运行规律的影响主要作用于喷头出口处的雾化过程,雾化过程的结果决定了后续雾滴空间运行的轨迹和飘移率。药液黏度和表面张力越大,出口处大粒径雾滴所占的比例越高,雾滴的平均粒径和空间运行速率相应增大,在空间运行过程中停留时间缩短,飘移率降低。确定了标准条件下黏度和表面张力调控的适宜范围:黏度在0.001~0.01 Pa·s之间,飘移率为18.77%~12.67%;表面张力在0.042~0.060 N/m之间,飘移率为38.93%~24.40%。针对实际场景,提出了调控药液物理性质的具体方案:通过将2%甲维盐乳油的黏度和表面张力分别增大至0.01 Pa·s和0.060 N/m,可以分别将4 m/s和5 m/s风速条件下的飘移率降低18%和43%,从而有效降低了农药雾滴的飘移损失。
Studying the spatial operation law of pesticide droplets and its influencing factors are of great significance for drift-off,environmental protection and additive development.2%emamectin benzoate emulsifiable concentrate was selected.The Euler-Lagrange discrete phase model was used to simulate droplet motion in space,and the spatial trajectory of the pesticide droplets was analyzed.The result showed that the atomization process at the outlet of the nozzle was mainly affect by the viscosity and the surface tension of the droplets.The trajectory and drift ratio of the subsequent droplet space operation was determined by the result of the atomization process.With the increase of viscosity and surface tension,the proportion of large particle droplets at the outlet and the average particle size of the droplets increased.While residence time and drift ratio decreased during space operation.Then,the appropriate regulation range of viscosity and surface tension was determined.By increasing the viscosity and surface tension to 0.001-0.01 Pa·s and 0.042-0.060 N/m,respectively,the drift rate became 18.87%-12.67%and 38.93%-24.40%,respectively.According to the actual scene,a specific scheme for regulating the physical properties of the pesticide droplets was proposed.By increasing the viscosity and surface tension of 2%emamectin benzoate emulsifiable concentrate to 0.01 Pa·s and0.060 N/m,respectively,the drift rate under wind conditions of 4 m/s and 5 m/s can be reduced by 18%and 43%,respectively,which has effectively reduced the drift ratio.
作者
赵峻逸
薛士东
宋小沫
兰忠
郝婷婷
马学虎
ZHAO Junyi;XUE Shidong;SONG Xiaomo;LAN Zhong;HAO Tingting;MA Xuehu(School of Chemical Engineering,Dalian University of Technology,Dalian 116024,Liaoning Province,China)
出处
《农药学学报》
CAS
CSCD
北大核心
2020年第2期306-314,共9页
Chinese Journal of Pesticide Science
基金
国家重点研发计划项目(2017YFD0200304).
关键词
减量增效
农药喷洒
雾滴飘移
数值模拟
药液性质
喷施优化
黏度
表面张力
reduce application and increase efficiency
pesticide spraying
droplet drift
numerical simulation
pesticide liquid properties
spray optimization
viscosity
surface tension
