Abstract
Rotary atomizers are mainly used in agricultural manned aircrafts. Atomization characteristics at high speeds have been studied, but methods to measure the atomization efficiency have not been elucidated. The atomization efficiency of rotary atomizers under high-speed airflow was investigated using an IEA-I high-speed wind tunnel experimental installation, AU5000 rotary atomizer, and a laser diffraction particle size analyzer. Accordingly, a model equation for atomization efficiency measurements was innovatively obtained. When the flow rate, fan blade angle of the atomizer, and wind speed were used as variables, the experimental results showed that the atomization efficiency mainly depended on the fan blade angle. When the fan blade angle was 35°, the atomization efficiency was optimal, regardless of wind speed. In contrast, when the fan blade angle of the atomizer was 65°, it exhibited the worst atomization efficiency, regardless of the wind speed. The experimental data from this study can provide guidance for aerial application in fixed-wing manned aircraft, such as the flow rate, and operating speed.
Highlights
In agriculture, the aerial application of products has the advantages of high spraying speed, high spraying efficiency, relatively low energy consumption, and wide terrain adaptability
Rotary atomizers are widely used with fixed-wing manned aircraft, and the particle size is controllable
The atomization efficiency directly affects the cost of aerial application
Summary
The aerial application of products has the advantages of high spraying speed, high spraying efficiency, relatively low energy consumption, and wide terrain adaptability. Rotary atomizers are widely used with fixed-wing manned aircraft, and the particle size is controllable They generate resistance during flight, and the extra resistance increases fuel consumption and cost of the spraying operation. Zhang et al [15] studied the spray characteristics of pressure–swirl nozzles, which are widely used in agriculture, combustion, aerospace, and other fields They focused on the effects of the nozzle hole size and injection pressure on the spray morphology, velocity distribution, and spray angle. Dorr et al [16] measured the initial spray characteristics (initial droplet size and velocity, fan angle, and spray liquid density) of a hydraulic nozzle with different spray mixtures, and the spray sheet velocity was measured using PIV. The equation for the work model equation of energy consumption during droplet break-up is as follows:
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