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Dynamic evaporation of droplet with adjuvants under different environment conditions

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International Journal of Agricultural and Biological Engineering 2020年第2期13卷 1-6页

作者： Zhichong Wang Luchen Lan Xiongkui He andreas herbst College of Science China Agricultural UniversityBeijing 100193China Julius-Kühn-Institut Institute for Application Techniques in Plant Protection38104 BraunschweigGermany

Pesticide droplet is evaporating during the falling from the nozzle to the *** dynamic evaporation is influenced by ambient temperature,relative humidity(RH),adjuvant type and *** the evaporation process,the droplet size at different height is affected by the droplet *** on this,this study determined the droplet dynamic evaporation by collecting the droplets from different height via silicone oil method with a certain temperature and *** adjuvants were chosen,including three organo-silicon,three vegetable oil and two non-ionic,with five *** droplets were generated by a droplet *** results showed that the type of adjuvant,ambient temperature and RH had no significant influence on droplet size generated by droplet *** the adjuvants in this experiment cannot reduce dynamic evaporation;Concentration of adjuvant made a difference in dynamic *** could be because of the property of ***-silicon adjuvants have a negative correlation with water vapor pressure,it showed less dynamic evaporation at high temperature and *** oil and non-ionic adjuvant,they are the same as the controlled blank that the dynamic evaporation reduces with decreasing temperature and increasing RH.

关键词： pesticide droplet dynamic evaporation adjuvant temperature relative humidity

Recent development of unmanned aerial vehicle for plant protection in East Asia

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International Journal of Agricultural and Biological Engineering 2017年第3期10卷 18-30页

作者： He Xiongkui Jane Bonds andreas herbst Jan Langenakens College of Science Centre for Chemicals Application Technology(CCAT)China Agricultural UniversityBeijing 100193China Bonds Consulting Group LLC Panama City Florida 32408USA JKI-Federal Research Centre for Cultivated Plants Institute for Application Techniques in Plant ProtectionMesseweg 11/12 D-38104 BraunschweigGermany AAMS-Salvarani Vliegplein 14A9991 MaldegemBelgium

Recently,the growing use of unmanned aerial vehicles(UAV)for pesticide application has been reported against a wide range of crops with promising results in East Asian countries such as Japan,South Korea and *** UAV-based application technology for agrochemicals is considered as a high efficiency alternative to the conventional manual spray operations and a low-cost choice as compared to the classical manned aerial ***,the technology adoption rate and the designed optimal sprayer suitable for drone application for small scale farm remains at the development stage in China and also in *** paper reports the current status of drone pesticide application in China and makes comparisons with its neighbor countries Japan and South Korea in terms of different UAV platforms and their implementation in plant protection for different *** and opportunities for future development of UAV-based pesticide application technology are also discussed.

关键词： plant protection UAV pesticide application RPA spray technology spray quality flight control agrochemical application

Spray drift characteristics test of unmanned aerial vehicle spray unit under wind tunnel conditions

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International Journal of Agricultural and Biological Engineering 2020年第3期13卷 13-21页

作者： Changling Wang Aijun Zeng Xiongkui He Jianli Song andreas herbst Wanlin Gao Centre for Chemicals Application Technology China Agricultural UniversityBeijing 100193China College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China College of Science China Agricultural UniversityBeijing 100193China Institute for Chemical Application Technology of JKI Messeweg 11/12 D-38104 BraunschweigGermany

Since the 2010s,unmanned aerial vehicle(UAV)sprayer was applied more and more widely for low-volume aerial pesticides spraying operations in ***,droplets from the UAV sprayer have a higher drift risk due to more fine droplets sprayed and a higher flight height than ground *** on UAV spray drift has been a new hot spot within the field of pesticide application *** of previous studies used direct field methods for spray drift,but the meteorological conditions in field were unstable and uncontrollable,and drift research under an actual operation state in wind tunnel has not been ***,25 treatments of wind tunnel measurements and droplets spectrum tests of 10 models of nozzles were conducted to explore the influence factor on spray drift characteristics of UAV chemicals application in this study.A spray unit with a rotor of UAV was innovatively installed in wind tunnel,and the airstream from the wind tunnel was regarded as the relative moving natural wind to simulate the flight *** airborne and the sediment spray drift was measured to study the effects of the nozzle type and size(flat fan,hollow cone and air-inclusion nozzles),flight speed,adjuvant(DRS-60,Y-20079,MF and G-611)and meteorological parameters(20°C&40%,20°C&80%,30°C&40%and 30°C&60%).The drift potential(DP)and the drift potential reduction percentage(DPRP)in vertical and horizontal directions were obtained for each *** nozzle type and size had an impact on the spray drift potential obviously by affecting the droplet size and the ratio of fine droplets,and the regression linear models between DPRPV/DPRPH and DV50,V75 were established(R2=0.934/0.925).Flight speed also had a significant effect on the spray drift characteristics,and reducing the flight speed could increase the DP *** spray adjuvants could affect the DP under experimental meteorological parameters,and the anti-drift performance ranked in the order of DRS-60>MF>Y-20079>G-611

关键词： unmanned aerial vehicle(UAV)sprayer wind tunnel spray drift potential nozzle adjuvant

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两类扇形雾喷头雾化过程比较研究

农业工程学报 2013年第5期29卷 25-30页

作者：谢晨何雄奎宋坚利 andreas.herbst 中国农业大学理学院 Institute for Chemical Application Technology of JKI Messeweg 11/12D-38104 BraunschweigGermany

为了探究标准扇形雾喷头(ST)与防飘喷头(IDK)的雾化特性,利用雾滴粒径分析仪(PDIA)对以上2种类型喷头的雾化过程进行了试验研究与可视化图形分析。结果表明:ST喷头具有面积较大的液膜区,且具有波纹结构,破裂区内的破裂孔洞呈现不规则撕... 详细信息

为了探究标准扇形雾喷头(ST)与防飘喷头(IDK)的雾化特性,利用雾滴粒径分析仪(PDIA)对以上2种类型喷头的雾化过程进行了试验研究与可视化图形分析。结果表明:ST喷头具有面积较大的液膜区,且具有波纹结构,破裂区内的破裂孔洞呈现不规则撕裂状;IDK喷头液膜区面积较ST喷头小,具有气泡状结构,但并未发现波纹区。随着ST与IDK喷头孔径的增大,液膜长度、破裂区长度分别由20mm增长至40mm、10mm增长至20mm。随着压力的增加,ST110-03型喷头的液膜长度由35mm降低至22mm,雾滴体积中径由128.2μm降低至92.4μm;IDK120-03型喷头的液膜-破裂区长度由40mm降低至30mm,雾滴体积中径由366.4μm降低至285.3μm。该研究可为进一步研究新型防飘喷头的雾化特性以及新型喷雾设备的生产提供参考。

关键词：喷头雾化可视化液膜植保

Testing method and distribution characteristics of spatial pesticide spraying deposition quality balance for unmanned aerial vehicle

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International Journal of Agricultural and Biological Engineering 2018年第2期11卷 18-26页

作者： Changling Wang Xiongkui He Xiaonan Wang Zhichong Wang Shilin Wang Longlong Li Jane Bonds andreas herbst Zhiguo Wang College of Science China Agricultural UniversityBeijing 100193China Bonds Consulting Group LLC Panama City Florida 32408USA Institute for Application Techniques in Plant Protection Julius Kühn-Institute(JKI)Federal Research Centre for Cultivated PlantsMesseweg 11/12 D-38104 BraunschweigGermany Quanfeng Aviation Plant Protection Technology Co. Ltd.Anyang 455001China

In order to explore the spatial pesticide spraying deposition distribution,the downwash flow field characteristics for unmanned aerial vehicle(UAV)pesticide application with accurate flight height and velocity and the relationship of these two aspects,a novel measurement method was proposed in this paper.A model‘3WQF80-10’single-rotor diesel UAV was tested using this method in wheat field and the effects of flight direction,flight parameters and crosswind on the distribution of spatial spraying deposition quality balance(SSDQB)and the downwash flow field distribution were researched.A cuboid aluminum sampling frame of spatial spraying deposition quality balance(SFSSDQB)with monofilament wires was made for collecting the droplets in four directions,and a set of multi-channel micro-meteorology measurement system(MMMS)was applied for measuring the downwash wind speed in three ***,BeiDou Navigation Satellite System(BNSS)was used for controlling and recording the working height,velocity and track of this model of single-rotor *** results showed the distribution of the spatial spray deposition and the downwash flow field of UAV could be measured effectively at exact flight height and velocity via this *** the average wind speed was 0.9 m/s,the average temperature was 31.5℃ and the average relative humidity was 34.1%,and the average distribution ratios of spraying deposition for model‘3WQF80-10’UAV on the upwind part,the top part,the downwind part and the bottom part were 4.4%,2.3%,50.4%and 43.7%,*** flight directions of forward and backward had an impact on droplet deposition distribution and the working effect of flying backwards,with 60%of deposition ratio of the bottom part of the SFSSDQB,was better than flying *** was a linear negative correlation between the coefficient of variation(CV)of the bottom part and the flight height and the coefficient of determination was 0.9178,which means that the deposition distribution

关键词： unmanned aerial vehicle(UAV) spatial spraying deposition distribution downwind airflow flow field

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助剂类型及浓度对不同喷头雾滴飘移的影响

农业工程学报 2015年第22期31卷 49-55页

作者：王潇楠何雄奎宋坚利 andreas.herbst 中国农业大学理学院 Institute for Chemical Application Technology of JKI Messeweg 11/12 D-38104 BraunschweigGermany

为探究助剂类型及浓度对不同喷头飘移的影响,该研究利用风速、温度、湿度可调风洞及荧光分析仪spectrofluorophotometor RF-1501比较分析了不同浓度抗蒸发助剂Agrospred 730(又名AS-2)、防飘移助剂Break—thru Vibrant、Silwet DRS-60、... 详细信息

为探究助剂类型及浓度对不同喷头飘移的影响,该研究利用风速、温度、湿度可调风洞及荧光分析仪spectrofluorophotometor RF-1501比较分析了不同浓度抗蒸发助剂Agrospred 730(又名AS-2)、防飘移助剂Break—thru Vibrant、Silwet DRS-60、Greenwet 360对离心喷头、平面扇形雾喷头Lechler ST 110-015、空心圆锥雾喷头TR 80-015以及德国联邦农作物研究中心施药技术研究所(Julius-Kühn-Institut,JKI)规范中的对比参考喷头Lumark F110-03的飘移潜在指数(drift potential index,DIX)的影响,并利用spraytec雾滴粒径仪测试其雾滴体积中径(volume median diameter,VMD)。结果表明:AS-2的体积分数为0.05%时,与水相比可将离心喷头DIX增加81.8%,VMD增加16.7%;Silwet DRS-60、Break—thru Vibrant、Greenwet 360体积分数分别为0.8%、0.4%、0.3%时防飘效果最好,对TR80-015防飘效果最为显著,可将其DIX(相比于水)依次减小98.7%、58.2%和80.1%,3种助剂分别在上述体积分数下对3种液力式喷头的防飘效果均依次为TR80-015>ST110-015>Lumark F110-03;对于助剂Silwet DRS-60和Greenwet 360,VMD0.5);VMD越大,喷头DIX越小,即VMD变化与DIX变化呈现负相关性,VMD及VMD<75μm的雾滴所占体积百分比均为影响喷头DIX的重要因素。该研究可为田间实际生产中助剂的添加与选择提供依据,为进一步研究新型农药助剂、新型喷头及喷雾设备的生产提供理论基础。

关键词：喷雾喷头农药助剂抗蒸发防飘移风洞飘移

植保无人机低空低量施药雾滴沉积飘移分布立体测试方法

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农业工程学报 2020年第4期36卷 54-62页

作者：王志翀 andreas herbst Jane Bonds 曾爱军赵铖何雄奎中国农业大学理学院北京100193 Julius-Kühn-Institut Institute for Application Techniques in Plant ProtectionMesseweg 11/12Braunschweig 38104Germany Bonds Consulting Group LLC 3900 Wasp StreetPanama City BeachFlorida 32408USA

随着植保无人机在中国的广泛使用,植保无人机的沉积分布均匀性与雾滴飘移流失也引起各方面的重视。目前,针对植保无人机施药雾滴沉积飘移的测试方法较少,且着重于从沉积或飘移中某一方面分析植保无人机雾滴沉积飘移规律,未对作业中全方... 详细信息

随着植保无人机在中国的广泛使用,植保无人机的沉积分布均匀性与雾滴飘移流失也引起各方面的重视。目前,针对植保无人机施药雾滴沉积飘移的测试方法较少,且着重于从沉积或飘移中某一方面分析植保无人机雾滴沉积飘移规律,未对作业中全方位的雾滴的沉积飘失规律进行系统测试。该文基于国际标准ISO22866和ISO24253建了1套针对低空低量植保无人机的立体测试方法,分别在地面布置沉积和飘移收集器,在空中架设立体沉积和空中飘移收集器,结合航拍影像所获取的植保无人机准确作业参数,对4个型号植保无人机分别搭载德国Lechler公司的IDK120-015和TR80-0067喷头进行了测试,系统分析了无人机周边的总沉积以验证方法准确性,计算了总地面沉降以表征可利用部分和空中耗散以评估环境风险。结果表明,各植保无人机地面沉积率在53.6%~76.6%,地面飘移率最高17.4%,空中飘移率可高达14.7%;该测试系统可收集62.4%~101.7%无人机喷洒出的雾滴。测试的4种植保无人机在搭载IDK喷头后均明显降低了雾滴飘移,但也同时降低地面沉积率;各植保无人机在搭载2种喷头时沉积规律不同,不同植保无人机设计需要选择不同喷头。该测试方法能够有效的收集并分析植保无人机在作业区域的雾滴立体分布状态,可为植保无人机综合评估提供新的参考依据。

关键词：农药无人机测试方法立体分布沉积飘移

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标准扇形雾喷头雾化过程测试分析

农业工程学报 2007年第9期23卷 95-100页

作者：吕晓兰何雄奎宋坚利曾爱军 andreas. herbst 中国农业大学工学院北京100094 Federal Biological Research Centre for Agriculture and Forestry

为了描述雾滴颗粒特性与飘失之间的关系,用激光衍射粒度仪(PDPA)对植保机械标准扇型雾喷头的雾化场进行了研究,主要描绘了雾化场雾滴特征参数,并对雾滴尺寸空间分布和雾滴的运动进行分析,确定了飘失区域在雾化场中的位置,为进一步分析... 详细信息

为了描述雾滴颗粒特性与飘失之间的关系,用激光衍射粒度仪(PDPA)对植保机械标准扇型雾喷头的雾化场进行了研究,主要描绘了雾化场雾滴特征参数,并对雾滴尺寸空间分布和雾滴的运动进行分析,确定了飘失区域在雾化场中的位置,为进一步分析雾滴的沉降及漂移特性提供了理论支持。结果表明:在逐渐远离喷头的截面上,雾滴直径分布呈中间小边缘大的凹形椭球面,而轴向速度则是呈中间大边缘小的山丘形分布。雾锥体外层空间区域雾滴密度小,小雾滴能量小且易蒸发,易受周围环境影响发生飘失,是雾滴易飘失区域。

关键词：雾滴尺寸雾滴速度空间分布漂失

助剂S240对水分散性粒剂及乳油药液雾化的影响

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农业工程学报 2014年第11期30卷 61-67页

作者：张文君何雄奎宋坚利王昌陵 andreas.herbst 中国农业大学理学院北京100193 Institute for Chemical Application Technology of JKI Messeweg 11/12 D-38104Braunschweig 65236Germany

为探究药液性质对喷头雾化的影响,该文应用粒子图像分析系统、高速摄影仪及粒径分析仪对ST110-03喷头与IDK120-03喷头进行试验研究,分析了水分散性粒剂Don-q、乳油Score及2种药剂条件下助剂Breakthru S240浓度对雾化区及雾滴谱的影响。... 详细信息

为探究药液性质对喷头雾化的影响,该文应用粒子图像分析系统、高速摄影仪及粒径分析仪对ST110-03喷头与IDK120-03喷头进行试验研究,分析了水分散性粒剂Don-q、乳油Score及2种药剂条件下助剂Breakthru S240浓度对雾化区及雾滴谱的影响。未添加助剂时,农药剂型不同,2类喷头的雾化区及雾滴体积中径(volume medium diameter,VMD)均发生显著变化,水分散性粒剂溶液与自来水的雾化区结构、液膜长度和VMD相差不大;乳油溶液可以使2类喷头的雾化区结构发生显著变化,液膜长度分别减小35.2%和40.5%,VMD分别增大13.5%和28.9%;不同剂型农药条件下,随助剂浓度增大,2类喷头液膜区及破碎区结构均发生不同程度的变化,液膜长度均先减小后增大,VMD先增加后减小,即液膜长度变化与VMD变化呈现负相关性。结合药液理化性质研究发现表面张力是影响雾化的重要因素之一。该研究可为田间助剂浓度的添加范围及喷头雾化特性的模拟与模型建立提供参考。

关键词：喷雾雾化试验助剂S240 水分散性粒剂乳油高速摄影