Abstract Impact sprinkler (20PY2 IS) outlet is a single-phase water flow, and the aeration impact sprinkler (20PY2 AIS) outlet is gas-liquid two-phase flow. The jet dispersing principle of AIS is somewhat different from conventional sprinklers and has advantages and the ability to working well at the low-pressure condition. The experimental study on the droplet size distribution of IS and AIS was carried out by the volume-weighted method to analyze the mean diameter (Dv), median diameter(D50), water droplets frequency distribution, and the cumulative frequency at different distances from sprinklers. Similarly, the velocity of the drop was measured by Laser Precipitation Monitor (LPM) and statically analyzed by using a number-weighted method. The results showed that both the drop diameters Dv and D50 increased with the distance from the sprinkler nozzle but decreased with an increase in the working pressure. Similarly, droplet frequency distribution at a diameter

中文翻译：

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带曝气和不带气冲击喷淋喷嘴的低压降尺寸分布特征

摘要 冲击喷头（20PY2 IS）出口为单相水流，曝气冲击喷头（20PY2 AIS）出口为气液两相流。AIS的射流分散原理与传统喷头有些不同，具有优势，能够在低压条件下良好工作。采用体积加权法对IS和AIS的液滴粒径分布进行实验研究，分析平均直径（Dv）、中值直径（D50）、水滴频率分布以及距喷头不同距离处的累积频率. 类似地，液滴的速度由激光降水监测仪 (LPM) 测量，并使用数字加权方法进行静态分析。结果表明，液滴直径 Dv 和 D50 都随着距喷头的距离增加而增加，但随着工作压力的增加而减小。类似地，直径处的液滴频率分布