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Effect of working pressure and spacing of nozzles on the quality of spraying distribution
Crop Protection ( IF 2.8 ) Pub Date : 2021-09-14 , DOI: 10.1016/j.cropro.2021.105818
Fabiano Griesang 1 , Ana Beatriz Dilena Spadoni 2 , Pedro Henrique Urah Ferreira 2 , Marcelo da Costa Ferreira 2
Affiliation  

The correct placement of the crop protection product on the target depends on the adequate distribution provided by the spray nozzles. In this research, the objective was to verify the influence of the working pressure and spacing between nozzles on the quality of the spray distribution. It was analyzed the nozzles jets concerning symmetry, opening angle and flow rate. Two methodologies for determining the volumetric distribution were used, considering (1) the simultaneous collection of a set of nozzles arranged in a spray boom and (2) the volumetric distribution of each discrete sample of nozzle. Overlapping between spray jets was used to calculate the coefficient of variation (CV) due the nozzles spacing. Nine models of flat fan nozzles were used, at two nominal flow rates and four working pressures. The working pressure achieved a big effect on the quality of volumetric distribution. The pressure of 100 kPa produced the worse results of volumetric distribution, with CVs higher than 10% along the boom for all nozzle models, in both flow rates. Continuous improvements in the quality of distribution were observed with the increase in pressure until reaching 300 kPa, followed by a slight decrease in quality when reaching 400 kPa pressure. The spray nozzle model has also a big effect on the quality of distribution and there are no implied design characteristics that can turn easier a better choice of nozzles. Both methodologies for the determination of spray distribution achieved similar results and can be used for the nozzles spray distribution quality determination.



中文翻译:

工作压力和喷嘴间距对喷雾分布质量的影响

作物保护产品在目标上的正确放置取决于喷嘴提供的适当分布。在这项研究中,目的是验证工作压力和喷嘴间距对喷雾分布质量的影响。对喷嘴射流的对称性、开度角和流量进行了分析。使用两种确定体积分布的方法,考虑(1)同时收集布置在喷杆中的一组喷嘴和(2)每个离散喷嘴样品的体积分布。喷嘴之间的重叠用于计算由于喷嘴间距引起的变异系数 (CV)。使用了九种型号的扁平扇形喷嘴,两种标称流量和四种工作压力。工作压力对容积分布质量有很大影响。100 kPa 的压力产生了更差的体积分布结果,在两种流速下,所有喷嘴型号沿喷杆的 CV 均高于 10%。随着压力的增加直到达到 300 kPa,观察到分布质量的持续改进,然后在达到 400 kPa 压力时质量略有下降。喷嘴模型对分配质量也有很大影响,并且没有隐含的设计特征可以更容易地更好地选择喷嘴。两种测定喷雾分布的方法都取得了相似的结果,可用于喷嘴喷雾分布质量的测定。100 kPa 的压力产生了更差的体积分布结果,在两种流速下,所有喷嘴型号沿喷杆的 CV 均高于 10%。随着压力的增加直到达到 300 kPa,观察到分布质量的持续改进,然后在达到 400 kPa 压力时质量略有下降。喷嘴模型对分配质量也有很大影响,并且没有隐含的设计特征可以更容易地更好地选择喷嘴。两种测定喷雾分布的方法都取得了相似的结果,可用于喷嘴喷雾分布质量的测定。100 kPa 的压力产生了更差的体积分布结果,在两种流速下,所有喷嘴型号沿喷杆的 CV 均高于 10%。随着压力的增加直到达到 300 kPa,观察到分布质量的持续改进,然后在达到 400 kPa 压力时质量略有下降。喷嘴模型对分配质量也有很大影响,并且没有隐含的设计特征可以更容易地更好地选择喷嘴。两种测定喷雾分布的方法都取得了相似的结果,可用于喷嘴喷雾分布质量的测定。随着压力的增加直到达到 300 kPa,观察到分布质量的持续改进,然后在达到 400 kPa 压力时质量略有下降。喷嘴模型对分配质量也有很大影响,并且没有隐含的设计特征可以更容易地更好地选择喷嘴。两种测定喷雾分布的方法都取得了相似的结果,可用于喷嘴喷雾分布质量的测定。随着压力的增加直到达到 300 kPa,观察到分布质量的持续改进,然后在达到 400 kPa 压力时质量略有下降。喷嘴模型对分配质量也有很大影响,并且没有隐含的设计特征可以更容易地更好地选择喷嘴。两种测定喷雾分布的方法都取得了相似的结果,可用于喷嘴喷雾分布质量的测定。

更新日期:2021-09-17
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