Abstract
A series of air induction nozzles were tested in a high-speed wind tunnel. Droplet size spectra were measured for four air induction nozzles (IDK-120-01, IDK-120-02, IDK-120-03 and IDK-120-04) each at three spray pressures (0.3, 0.4 and 0.5 MPa) and seven different air velocities (121.7, 153.4, 185.5, 218.4, 253.5, 277.5 and 305.5 km·h<sup>−</sup><sup>1</sup>). The measurement distance (0.15, 0.25 and 0.35 m) from the nozzle orifice was found to be important for the atomization of the droplets. The response surface method was used to analyze the experimental data. The results indicated that <i>D</i>v<sub>0.1</sub> and <i>D</i>v<sub>0.5</sub> of the droplets decreased quasi-linearly with increased wind speed, while <i>D</i>v<sub>0.9</sub> was affected by the quadratic of wind speed. <i>D</i>v<sub>0.1</sub>, <i>D</i>v<sub>0.5</sub> and <i>D</i>v<sub>0.9</sub> of the droplets were all proportional to the orifice size, and were not markedly influenced by the spray pressure. The percentage of the spray volume consisting of droplets with a diameter below 100 <font style="font-family:Symbol">m</font>m (%<100 <font style="font-family:Symbol">m</font>m) was found to be quadratically related to wind speed, and was not markedly influenced by the spray pressure and orifice size. However, the effect of the orifice size on the %< 200 <font style="font-family:Symbol">m</font>m could not be ignored.
Highlights
With its low cost and high efficient performance, aerial spraying has become the most common method for pesticide application in large fields[1]
Kirk and Hewitt studied the influence of wind speed, spray pressure, orientation angle of the nozzle and nozzle orifice size on aerial spray droplet size spectra in various wind tunnel experiments[8,12]
This paper tested a series of air induction nozzles at the IEA-I high-speed wind tunnel in NRCIEA
Summary
With its low cost and high efficient performance, aerial spraying has become the most common method for pesticide application in large fields[1]. Wind tunnels have been used to simulate a real flight-speed environment to estimate the air shear effect on the droplets generated by the aerial spray nozzles. Kirk and Hewitt studied the influence of wind speed, spray pressure, orientation angle of the nozzle and nozzle orifice size on aerial spray droplet size spectra in various wind tunnel experiments[8,12]. These four parameters were used to assess the spray droplet size spectra of the flat fan nozzles. The response surface method has been used to design experiments
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