Abstract

A micro-sprinkling hose is promising water-saving irrigation equipment due to its low cost and ease of installation and dismantlement during operation. The performance of the micro-sprinkling hose depends on the kinetic energy generated during field irrigation, which in turn is determined by the distribution of water droplets sprayed into the air. This paper aims to investigate the droplet diameter distribution provided by micro-sprinkling hoses by determining drop characteristics and assessing the impacts of the pressure and spraying angle on the droplet diameter distribution. Therefore, an indoor experiment was conducted to investigate the drop diameter distribution provided by micro-sprinkling hose under different pressures (20, 24, 28, and 32 kPa) and spraying angles (20°, 30°, 40°, 50°, 60°, 70°, and 80°). Droplet characteristic parameters were measured and collected using a laser precipitation monitor (LPM). The results show that (1) the diameter of water droplets sprayed from a micro-sprinkling hose with a single-hole diameter increases with increasing pressure, resulting in an expanded distribution range. Moreover, the diameter of these droplets initially increases and then decreases with increasing spraying angle. The maximum droplet is observed at a spraying angle of 40°. (2) The percentage of water droplets increases with increasing distance from the ground, with a diameter distribution range of 0–2.00 mm and an increase in the droplet diameter from 0.50 to 0.75–1.00 mm. The results reflect the characteristics of the droplet diameter distribution obtained with micro-sprinkling hoses under different pressures and spraying angles, providing guidance for the design of hose structures.

中文翻译：

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基于LPM的微喷水管雾滴尺寸及分布分析

摘要

微喷水软管因其成本低、运行过程中安装和拆卸方便而成为有前途的节水灌溉设备。微喷水软管的性能取决于田间灌溉时产生的动能，而动能又取决于喷洒到空气中的水滴的分布。本文旨在通过确定液滴特性并评估压力和喷雾角度对液滴直径分布的影响，研究微喷洒软管提供的液滴直径分布。因此，进行了室内实验，研究了微喷水软管在不同压力（20、24、28和32 kPa）和喷洒角度（20°、30°、40°、50°、60°）下提供的雾滴直径分布。 °、70° 和 80°）。使用激光沉淀监测仪（LPM）测量和收集液滴特征参数。结果表明：（1）单孔直径微喷水软管喷出的水滴直径随压力增大而增大，分布范围扩大。此外，随着喷雾角度的增加，这些液滴的直径先增大后减小。在 40° 的喷雾角度下观察到最大液滴。(2)水滴所占比例随着距地面距离的增加而增加，直径分布范围为0~2.00 mm，水滴直径从0.50 mm增加到0.75~1.00 mm。研究结果反映了微喷淋软管在不同压力和喷雾角度下获得的雾滴直径分布特征，为软管结构设计提供指导。