水利学报Issue(4)：467-473,7.DOI:10.13243/j.cnki.slxb.2014.04.012
圆形喷灌机低压阻尼喷头水滴直径分布规律的试验研究
Droplet size distributions of low-pressure damping sprinklers used in center-pivot irrigation systems
摘要
Abstract
In order to improve coefficient of water distribution uniformity and lessen impact force of droplet on the soil and crops, low-pressure damping rotating sprinklers have been gradually applied on the center pivot irrigation systems in recent years, instead of non-rotating sprinklers. In this study, droplet size distri-butions of low-pressure damping of R3000 and A3000 sprinklers with three nozzles (diameters of 2.97, 4.96 and 6.95 mm, respectively) were measured with the flour method at two operating pressures of 100 and 140 kPa. The mean diameter of spray droplets and the overall droplet size distributions were calculated for each scenario. The effects of rotating speed, nozzle diameter and operating pressure on the droplet size were also analyzed. The results show that in comparison with the R3000 sprinkler at the same nozzle size and operating pressure, the A3000 sprinkler rotates faster, with a smaller spraying range and maximum droplet diameter. The spraying ranges of the two sprinklers increase with nozzle diameter. The maximum droplet diameter decreases with the increase of operation pressure. At the same operation pressure, the spraying ranges of the two sprinklers tend to increase with nozzle diameter,but the maximum droplet diame-ter does not change significantly. The A3000 sprinkler droplet diameter distribution is narrower than the R3000 sprinkler. The median diameters of A3000 sprinkler are 3.6 %-8.9 % smaller than the R3000 sprin-kler in different conditions. In addition, the mean diameter of the spray droplet is exponentially fitted with the distance from the sprinkler, and the median diameter becomes smaller as the operating pressure in-creased or the nozzle diameter decreased.关键词
低压喷头/水滴直径/工作压力/喷嘴直径/转速Key words
low-pressure sprinkler/droplet size/operating pressure/nozzle diameter/rotating speed分类
农业科技引用本文复制引用
严海军,肖建伟,李文颖,李永冲,侯永胜..圆形喷灌机低压阻尼喷头水滴直径分布规律的试验研究[J].水利学报,2014,(4):467-473,7.基金项目
国家自然科学基金资助项目（51179191，51321001）；北京市优秀人才培养资助项目（2011D009007000003）；中央高校基本科研业务费专项资金资助项目 （）
