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当前位置: 首页 > 文章 > 两种小流量喷头的粒径谱和速度场测量试验 中国农机化学报 2014,35 (5) 77-82+86
Position: Home > Articles > Measurement experiments of particle size spectra and velocity field of three kinds of small flow nozzles Journal of Chinese Agricultural Mechanization 2014,35 (5) 77-82+86

两种小流量喷头的粒径谱和速度场测量试验

作  者：
管贤平;邱白晶;欧鸣雄;董晓娅;薛新宇
单  位：
农业部现代农业装备重点实验室;江苏大学现代农业装备与技术教育部重点实验室
关键词：
喷头;粒径;速度场;粒子图像测速;激光粒度仪;农药剂型
摘  要：
针对两种小流量喷头,进行离喷头不同高度、不同压力的粒径谱测量,分析粒径谱随高度、压力变化情况;比较清水和乳油混合液的粒径谱,分析农药剂型对粒径谱的影响;进行清水和乳油喷雾时喷头出口处的雾滴速度场测量,分析农药剂型、喷头类型,压力等对喷头喷雾特性的影响。试验结果表明,压力、剂型对不同喷头的喷雾效果影响不同。总体上,喷雾压力越大,雾滴体积中径越小;相同压力下,扇形雾喷头在乳油喷雾时的粒径大于清水喷雾,而空心锥形雾喷头在乳油喷雾时粒径谱发生变化,产生细小雾滴分布。在乳油和清水喷雾时,扇形雾喷头的雾滴速度随压力增大而增大;在清水喷雾时,空心锥形雾喷头在压力增大时粒径减小,雾滴平均速度变化不大;在乳油喷雾时,空心锥形雾喷头由于产生细小雾滴,雾滴平均速度减少。
译  名：
Measurement experiments of particle size spectra and velocity field of three kinds of small flow nozzles
作  者：
Guan Xianping;Qiu Baijing;Ou Mingxiong;Dong Xiaoya;Xue Xinyu;Key Laboratory of Modern Agricultural Equipment and Technology,Ministry of Education;Key Laboratory of Modern Agricultural Equipment,Ministry of Agriculture;
关键词：
nozzle;;droplet size;;velocity field;;particle image velocimetry;;particle size analyzer;;pesticide formulation
摘  要：
The particle size spectrum measurements of three small flow nozzles with different pressure and nozzle height were carried out. The particle size spectrum change was analyzed with height and pressure changes. The spaying particle size spectra with clean water and emulsifiable concentrate( EC)mixture were compared to analyze the impact of pesticide formulations on the particle size spectrum. The fogdrop velocity field at the outlet of nozzle was measured with clean water and EC mixture spraying to analyze the pesticide formulations, nozzle type and pressure on the spraying characteristics of nozzles. The pressure and formulation make different impact on the spraying characteristics of different nozzles. In general, the larger the spray pressure,the smaller the volume median diameter(VMD). Under the same pressure, the VMD of fan nozzle with EC spraying was bigger than that with water. For hollow cone with EC spraying, the particle size spectrum changed, producing tiny fogdrop distribution. The fogdrop velocity of the fan nozzle increased with increasing pressure with both water and EC spraying, and the average fogdrop velocity of the hollow cone nozzle changed little with increasing pressure with water spraying due to the reduced particle size. When spraying with EC, hollow cone nozzles produced smaller fogdrops and the fogdrop mean velocity decreased.

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