Droplet Size Distribution Characteristics of Aerial Nozzles by Bell206L4 Helicopter under Medium and Low Airflow Velocity Wind Tunnel Conditions and Field Verification Test
Source abstract
Abstract
To investigate the spray atomization characteristics of aerial nozzles adapted to manned agricultural helicopters under medium-low airflow velocity (0 to 27.8 m/s) conditions, the droplet size test was carried out in both wind tunnel and field tests. In the wind tunnel test, the laser diffraction device (LDD) was used to test the spray droplet size of CP02, CP03, and CP04 aerial nozzles. A Bell206L4 helicopter was used in the field test. The results in the wind tunnel test showed that due to the nozzles had been used for a long time and the cause of wear, the spray stability of individual nozzles was affected during the test. The limitation of droplet size measurement by using LDD was also found. The field test results showed that the main distribution range of the droplet size measured in the field test was consistent with the results of the wind tunnel test, but the droplet size value was significantly higher and the uniformity of droplet size distribution was poorer than the wind tunnel test value due to the influence of the actual environment. However, the results of field test and wind tunnel test can still be used as a reference for each other.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Plant Surface Properties and Treatments · Electrohydrodynamics and Fluid Dynamics · Fluid Dynamics and Heat Transfer
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
College of Engineering, South China Agricultural University, Guangzhou 510642, China
National Center for International Collaboration Research on Precision Agricultural Aviation Pesticides Spraying Technology (NPAAC), Guangzhou 510642, China
College of Electronic Engineering, South China Agricultural University, Guangzhou 510642, China
Department of Biological and Agricultural Engineering, Texas A&M University, College Station, TX 77845, USA
Prology Consulting LLC, College Station, TX 77845, USA
USDA-Agricultural Research Service, Fort Collins, CO 80526, USA
Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, China
Funding
Guangdong Leading Talent Project · National Key Technologies Research and Development Program · 111 Project
References (34)
Show source-provided references
1. Current status and future trends of precision agricultural aviation technologies
2. Effect of UAV prewetting application during the flowering period of cotton on pesticide droplet deposition
3. Spray drift review: The extent to which a formulation can contribute to spray drift reduction10.1016/j.cropro.2012.10.020 ↗
4. Wang, G., Lan, Y., Yuan, H., Qi, H., Chen, P., Ouyang, F., and Han, Y. (2019). Comparison of spray deposition, control efficacy on wheat aphids and working efficiency in the wheat field of the unmanned aerial vehicle with boom sprayer and two conventional knapsack sprayers. Appl. Sci., 9.10.3390/app9020218 ↗
5. Establishing reference nozzles for classification of aerial application spray technologies
6. Droplet size spectra classification categories in aerial application scenarios10.1016/j.cropro.2008.03.010 ↗
7. Research status and development of pesticide spraying droplet size
8. Using laser diffraction to measure agricultural sprays: Common sources of error when making measurements
9. Comparison between indirect and direct spray drift assessment methods10.1016/j.biosystemseng.2009.08.004 ↗
10. Development of wind tunnel test technologies in agricultural aviation spraying
11. Measurement and prediction of atomization parameters from fixed-wing aircraft spray nozzles10.13031/2013.23123 ↗
12. Spray adjuvant effects on droplet size spectra measured by three laser-based systems in a high-speed wind tunnel10.1520/JAI101233 ↗
13. Precision spray modeling using image processing and artificial neural network
14. Spray deposition on plant surfaces: A modelling approach10.1071/FP08056 ↗
15. Assessing the deposition and canopy penetration of nozzles with different spray qualities in an oat (Avena sativa L.) canopy10.1016/j.cropro.2015.11.013 ↗
16. Determining the drift potential of Venturi nozzles compared with standard nozzles across three insecticide spray solutions in a wind tunnel10.1002/ps.4214 ↗
17. Spray characteristics and drift reduction potential with air induction and conventional flat-fan nozzles10.13031/2013.23129 ↗
18. Droplet size distribution of aerial nozzle for plant protection in wind tunnel and flight conditions
19. Wind tunnel and field evaluation of drift from aerial spray applications with multiple spray formulations
20. Distribution characteristics of droplet size in rice field and wind tunnel simulation test under airflow operation
21. Evaluating effective swath width and droplet distribution of aerial spraying systems on M-18B and Thrush 510G airplanes
22. Guo, S., Li, J., Yao, W., Zhan, Y., Li, Y., and Shi, Y. (2019). Distribution characteristics on droplet deposition of wind field vortex formed by multirotor UAV. PLoS ONE, 14.10.1371/journal.pone.0220024 ↗
23. Droplet drift characteristics of aerial spraying of AS350B3e helicopter
24. Evaluation of droplet deposition and effect of variable-rate application by a manned helicopter with AG-NAV Guía system
25. Current status and future trends of agricultural aerial spraying technology in China
26. ISO/TC23/SC6 (2008). Equipment for Crop Protection-Methods for the Laboratory Measurement of Spray Drift-Wind Tunnels, ISO Copyright Office. ISO 22856.
27. Measuring droplet size of agricultural spray nozzles-measurement distance and airspeed effects10.1615/AtomizSpr.2014008424 ↗
28. Drop properties after secondary breakup10.1016/0301-9322(93)90039-W ↗
29. Atomization characteristics of normal flat fan nozzle and air induction nozzle under high speed airflow conditions
30. Drop-size measurement techniques for sprays: Comparison of malvern laser-diffraction and aerometrics phase/doppler10.1364/AO.26.002144 ↗
31. Quality Control of Standardized Reference Spray Nozzles10.13031/2013.2686 ↗
32. Assessing the ability of image processing software to analyse spray quality on water-sensitive papers used as artificial targets10.1016/j.biosystemseng.2011.10.002 ↗
33. A portable scanning system for evaluation of spray deposit distribution10.1016/j.compag.2011.01.003 ↗
34. Visual and image system measurement of spray deposits using water–sensitive paper