摘要
针对国产农用喷嘴的雾滴粒径分级数据及方法缺失的问题,该文依据 ASAE S572.1 标准,以 NJS-01 植保低速风洞为平台建立了雾滴粒径标准测试方法。在规范的测试条件和测量程序下,以 Teejet 11001、11003、11006、8008 和 6510不锈钢芯扇形喷嘴为参考喷嘴,测试了 Teejet F110 、Lurmark F110 、国产 Lanao F110、YZS80、YZK80 等 24 种待分类喷嘴在 0.2、0.3、0.4 MPa 下的雾滴粒径。在此基础上建立了参考喷嘴的雾滴粒径分级参考图,提出了基于该参考图的喷嘴分级方法。同时用 Teejet、Lurmark 标准扇形雾喷嘴的测试数据和厂家提供的分级结果,验证了喷嘴分级方法的正确性和适用性。该文运用该分级方法对国产 Lanao F110、YZS80、YZK80 系列喷嘴在不同压力下的雾滴粒径进行分级,可为该类型国产喷嘴的选型和应用提供参考。
Measurement result of droplet size is affected by many factors such as spray liquid property, flow rate, spray pressure, orifice shape, and so on. Droplet size measurement results are different under different test methods. That means the droplet size measurement results of nozzles under different conditions have no significance of comparison and direct utilization. Nozzle classification based on droplet spectrum ignores the difference of laboratory data and obtain the same or similar nozzle classification results. However, nozzle classification method and test criteria have not been popularized or implemented in China, which leads to a fact that the nozzles made in China can not be classified or be compared with international nozzles. If ASAE nozzle classification reference map is used directly, the classification result will be misjudged. In order to solve the problem of the lack of data and methods of droplet size classification for domestic agricultural nozzles, a standard test method for droplet size was established in NJS-01 plant protection low speed wind tunnel based on ASAE S572.1 standard. Test conditions were as follows: airflow speed was 6.7 m/s and sampling distance was 30.5 cm. Sampling area was the whole spray section of laser scanning at a certain sampling distance. After determined standard test conditions and procedures, five reference nozzles were tested, namely Teejet 11001, 11003, 11006, 8008 and 6510 stainless steel core fans nozzle. On this basis, a reference map for droplet size classification of reference nozzles was established, and a nozzle classification method based on the reference map was proposed. According to the reference map of droplet size classification in NJS laboratory, droplet size was divided into 6 grades: very fine (VF), fine (F), medium (M), coarse (C), very coarse (VC) and extremely coarse (XC). Due to the limitation of measurement range and accuracy of DP-02 laser particle size analyzer, in this paper, we only considered the droplet size classification of common plant protection nozzles, and did not measure IP-16 and 6515 reference nozzles, which correspond for categories of extremely fine/very fine (XF/VF) and extremely coarse/ultra-coarse (XC/UC). Droplet sizes of 24 to be classified nozzles were measured at the pressure of 0.2, 0.3 and 0.4 MPa. To be classified nozzles were Teejet F110 (01-08), Lurmark F110 (015-05), Lanao F110 (015-05), YZS80 (02-04) and YZK80 (02-04). Nozzles were classified according to the position of droplet spectrum polyline on the reference map. Compared with test classification levels of Teejet F110 (01-08) and Lurmark F110 (015-05) standard fan-shaped spray nozzles and nominal nozzle levels provided by manufacturers, our results showed that most of the test levels of nozzles were in accordance with the nominal nozzle levels provided by manufacturers, except for the inconsistencies of classification levels of individual nozzles under individual pressures, which could indicate that the reference map of droplet size classification established by NJS wind tunnel laboratory and the nozzle classification method based on droplet spectrum were correct and adaptable. Droplet sizes of Lanao F110, YZS80 and YZK80 nozzles under different pressures were classified by this classification method, and the classification level of nozzles increased with the increase of nozzle type (nozzle aperture), and decreased with the increase of spray pressure. The same type of nozzles can be classified into different levels under different spray pressures. Droplet size was influenced by geometry shape of nozzle, the order of droplet size from large to small was YZS80, F110 and YZK80 under the same nozzle number and pressure. The results of classification were instructive for perfecting technical parameters of domestic nozzles, making it easy for users to choose nozzle type and to determine working pressure.
作者
周晴晴
薛新宇
周良富
孙涛
田志伟
Zhou Qingqing;Xue Xinyu;Zhou Liangfu;Sun Tao;Tian Zhiwei(Nanjing Agricultural Mechanization Research Institute,Ministry of Agriculture and Rural Areas,Nanjing 210014,China)
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2019年第9期66-72,共7页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家重点研发计划—研发和完善农业航空植保智能化装备关键部件(2016YFD0200702)
国家重点研发计划—农用航空作业关键技术研究与装备研发(2017YFD0701000)
中国农业科学院基本科研业务费专项(S201807)
关键词
喷嘴
喷雾
农药
雾滴谱
喷嘴分级
粒径测试
风洞
nozzles
spraying
pesticides
droplet spectrum
nozzle classification
droplet measurement
wind tunnel
