Data from: Update to the USDA-ARS Fixed-Wing Spray Nozzle Models

Published in Transactions of the ASABE 58(2): 281-295 (doi: 10.13031/trans.58.10896). 2015 American Society of Agricultural and Biological Engineers.
The current USDA-ARS aerial spray nozzle models were updated to reflect both new standardized measurement methods and systems as well as to increase operational spray pressure, aircraft airspeed, and nozzle orientation angle limits. The new models were developed using both central composite design and custom design response surface methodologies, which provide excellent fits to independently measured data (R2 values ranging from 0.81 to 0.99) for all droplet size parameters. The new models also updated the droplet size classification ratings by adopting a previously recommended set of nozzles and operational pressures that provide similar data to ASABE Standard Reference nozzles but are evaluated under aerial application conditions (primarily airspeed). Generally, for flat fan and deflection type nozzles, the new models result in increases to predicted DV0.1 data (droplet diameter at which 10% of the total spray volume is contained in droplets of equal or lesser diameter), decreases in DV0.5 and DV0.9 data (similar to DV0.1 but 50% and 90% of total spray volume), and increases in the percent of spray contained in droplets of 200 µm diameter or smaller. With straight stream nozzles, the DV0.1, DV0.5, and DV0.9 trends tend to be reversed. Droplet size classifications with the new models for flat fan and deflector type nozzles tend to shift ratings downward, as compared to the current models, with classes centered around fine and medium sprays. However, with straight stream nozzles, droplet size classifications tend to shift ratings upward as compared to the current models. The updated models will be used to populate spreadsheet and mobile device software-based user interfaces to provide aerial applicators with droplet size information for an increased range of nozzles and operational settings, allowing for better nozzle selection and operational guidance.
Resources in this dataset:

Resource Title: Droplet Size Data
File Name: All Data Fixed Wing Models 2014.csv
Resource Description: Measured Droplet size data from the reported study.

发表于《ASABE农业与生物工程学会学报》第58卷第2期，第281-295页（DOI: 10.13031/trans.58.10896），2015年美国农业与生物工程师学会。当前美国农业部ARS部门空中喷雾喷头模型经过更新，旨在反映新的标准化测量方法和系统，同时提升操作喷雾压力、飞机飞行速度和喷头取向角度的限制。新模型通过中心复合设计和定制设计响应面方法开发，与独立测量的数据（R²值介于0.81至0.99之间）对所有的液滴尺寸参数提供了优异的拟合。新模型还更新了液滴尺寸分类评级，通过采用先前推荐的一套喷头和操作压力，这些喷头和操作压力提供与ASABE标准参考喷头相似的数据，但评估条件为空中施药条件（主要指飞行速度）。通常，对于扇形和平移式喷头，新模型导致预测的DV0.1数据（包含在直径等于或小于该值的液滴中的总喷雾体积的10%）增加，DV0.5和DV0.9数据（类似于DV0.1，但分别为总喷雾体积的50%和90%）减少，且200微米直径或更小液滴中的喷雾百分比增加。对于直流水流喷头，DV0.1、DV0.5和DV0.9的趋势则相反。与新模型相比，扇形和平移式喷头的液滴尺寸分类通常向下调整评级，集中在细雾和中等喷雾类别。然而，与直流水流喷头相比，液滴尺寸分类的评级则倾向于向上调整。更新后的模型将被用于填充基于电子表格和移动设备软件的用户界面，为空中喷雾机提供更广泛喷头和操作设置下的液滴尺寸信息，从而实现更佳的喷头选择和操作指导。