Abstract
<abstract> <b><sc>Abstract.</sc></b> The distribution and mechanism of the droplet generated by the aerial spray nozzles mounted on the fixed-wing agricultural aircraft remains a hot research issue of aerial plant protection. The present paper describes a high speed wind tunnel atomization study of the droplet generated by an air induction nozzle and a flat fan nozzle. The experiment is conducted in the IEA-I high speed wind tunnel at NERCIEA with Marvern Spraytec Laser Diffraction system. The measurement point is set at 0.15m, 0.25m and 0.35m away from the orifice of the nozzle. The wind speed range is from 150km/h to 305km/h, and the tube pressure is set about 0.3MPa, 0.4MPa and 0.5MPa. The results of the experiment to the LU-120-03 nozzle showed that when the wind speed increase from 120km/h to 305km/h, the Dv0.5 of the droplets decreased from 220μm to 130μm. The Dv0.5 of the droplets generated by the IDK-120-03 nozzle decreased much rapidly from 450μm to 150μm. The measuring distance from the orifice of the nozzle is also found important to the diameter and relative span of the droplets. In our results, 0.35m away from the orifice of the nozzle is found to be a proper measuring point, where the droplets are fully atomized and the flow quality of the wind tunnel is good enough for the test.
Published Version
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