The objective of this paper was to investigate the effect of riser heights on rotation uniformity and application rate of the newly designed dynamic fluidic sprinkler. The dynamic fluidic sprinkler was tested using different nozzle sizes of 5 and 6 mm. The sprinkler head was mounted on 1.3, 1.5, 1.7 and 1.9 m risers at 90° in the horizontal direction and was placed about 0.9 m above the top of the cans. The following operating pressures were tested: 150 and 200 kPa. A program was written to simulate the non‐uniform of rotation of the nozzle during the full circle‐spraying process. It was found that the riser height had a significant effect on application rate and uniformity. The comparison of standard deviation with different risers showed that differences in standard deviation were much lower for the 1.9 m riser height. The deviation was in the range of 0.14 ~ 0.26, 0.14 ~ 0.42, 0.18 ~ 0.50 and 0.13 ~ 0.69 mm h⁻¹ considering the riser heights of 1.9, 1.7, 1.5 and 1.3 m. For all the nozzle sizes, a smaller standard deviation was recorded under 150 kPa. The deviation range was 0.15 ~ 0.24, 0.17 ~ 0.45, 0.18 ~ 0.45 and 0.2 ~ 0.66 mm h⁻¹ for 1.9, 1.7, 1.5 and 1.3 m, respectively. With respect to nozzle sizes, 5 mm gave better standard deviations and the deviation range was from 0.14 ~ 0.26, 0.15 ~ 0.45, 0.2 ~ 0.7 and 0.23 ~ 0.74 mm h⁻¹ with radial heights of 1.9, 1.7, 1.5 and 1.3 m, respectively. The range of the coefficient of uniformity values for overlapped quadrants for the 5 mm nozzle was as follows: 78% at a spacing of 10 to 72% at 80% overlapped spacing. The highest occurred at 50% spacing and increased with an overlapped spacing of 10 to 50%, ranging from 78 to 87% with an average of 82.5%. © 2020 John Wiley & Sons, Ltd.

中文翻译：

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立管高度对动态射流喷头旋转均匀度和使用率的影响

本文的目的是研究立管高度对新设计的动态射流喷头的旋转均匀性和施用率的影响。使用5毫米和6毫米的不同喷嘴测试了动态流体喷头。喷头在水平方向上以90°安装在1.3、1.5、1.7和1.9 m立管上，并放置在罐顶上方约0.9 m处。测试了以下工作压力：150和200 kPa。编写了一个程序，以模拟整个圆形喷涂过程中喷嘴旋转的不均匀性。发现立管高度对施用率和均匀性具有显着影响。不同立管的标准偏差的比较表明，对于1.9 m立管高度，标准偏差的差异要小得多。^-1，考虑冒口高度1.9、1.7、1.5和1.3 m。对于所有喷嘴尺寸，在150 kPa以下记录的标准偏差都较小。对于1.9、1.7、1.5和1.3m，偏差范围分别为0.15〜0.24、0.17〜0.45、0.18〜0.45和0.2〜0.66mm h ^-1。关于喷嘴尺寸，5 mm的标准偏差更好，偏差范围为0.14〜0.26、0.15〜0.45、0.2〜0.7和0.23〜0.74 mm h ^-1径向高度分别为1.9、1.7、1.5和1.3 m。5 mm喷嘴的重叠象限的均匀性系数值的范围如下：间距为10％时，间距为78％，间距为80％时，间距为72％。最高的发生在间距为50％的位置，并以重叠的10％至5​​0％的间距增加，范围从78％到87％，平均为82.5％。分级为4 +©2020 John Wiley＆Sons，Ltd.