## 3 Results  
### Analysis of the Test Results of the Droplet Size Distribution of the Teejet 80-03 Nozzle  
Table 2 shows the test results of droplet size under different pressures and spraying medium conditions. The droplet size distribution is shown in Figure 4. \begin{table}
\begin{tabular}{c c c c c c c} \hline
**Spraying** & **Pressure/MPa** & \(D_{\
u\
u 0.1}\)/\(\mu\)m & \(D_{\
u\
u 0.5}\)/\(\mu\)m & \(D_{\
u\
u 0.5}\)/\(\mu\)m & \(\Phi_{vol}\) \(<\) 150 \(\mu\)m/\% & \(R_{S}\)/\% \\ \hline  & 0.2 & 101.89 (\(\pm\)1.27) & 198.83 (\(\pm\)2.34) a & 294.27 (\(\pm\)6.78) & 37.72 (\(\pm\)0.45) & 0.97 (\(\pm\)0.05) ab \\
1 & 0.3 & 95.63 (\(\pm\)3.30) & 162.45 (\(\pm\)1.33) b & 246.92 (\(\pm\)1.64) & 46.17 (\(\pm\)0.38) & 0.93 (\(\pm\)0.02) a \\  & 0.4 & 88.81 (\(\pm\)2.30) & 139.86 (\(\pm\)1.19) c & 219.73 (\(\pm\)0.93) & 53.63 (\(\pm\)0.46) & 0.94 (\(\pm\)0.02) ab \\  & 0.2 & 117.98 (\(\pm\)2.48) & 209.08 (\(\pm\)6.03) a & 341.78 (\(\pm\)12.79) & 35.87 (\(\pm\)1.04) & 1.07 (\(\pm\)0.04) b \\
2 & 0.3 & 109.35 (\(\pm\)2.37) & 183.64 (\(\pm\)2.86) b\({}_{1}\) & 309.47 (\(\pm\)14.89) & 40.84 (\(\pm\)0.63) & 1.09 (\(\pm\)0.1) b \\  & 0.4 & 98.26 (\(\pm\)0.23) & 167.87 (\(\pm\)3.94) c\({}_{1}\) & 289.10 (\(\pm\)1.33) & 44.68 (\(\pm\)1.06) & 1.14 (\(\pm\)0.03) b \\  & 0.2 & 130.17 (\(\pm\)1.85) & 220.22 (\(\pm\)1.31) a\({}_{2}\) & 374.71 (\(\pm\)5.62) & 34.06 (\(\pm\)0.20) & 1.11 (\(\pm\)0.02) b \\
3 & 0.3 & 124.10 (\(\pm\)3.07) & 187.58 (\(\pm\)6.14) b\({}_{1}\) & 347.82 (\(\pm\)2.22) & 39.98 (\(\pm\)1.31) & 1.19 (\(\pm\)0.03) c \\  & 0.4 & 114.24 (\(\pm\)1.09) & 169.71 (\(\pm\)2.23) c\({}_{1}\) & 323.09 (\(\pm\)2.83) & 44.19 (\(\pm\)0.59) & 1.23 (\(\pm\)0.04) c \\  & 0.2 & 143.49 (\(\pm\)5.97) & 256.07 (\(\pm\)3.01) a\({}_{3}\) & 410.69 (\(\pm\)6.01) & 12.29 (\(\pm\)0.43) & 1.04 (\(\pm\)0.04) b \\
4 & 0.3 & 138.29 (\(\pm\)2.18) & 228.18 (\(\pm\)2.65) b\({}_{2}\) & 387.92 (\(\pm\)4.91) & 15.87 (\(\pm\)0.16) & 1.08 (\(\pm\)0.02) b \\  & 0.4 & 133.49 (\(\pm\)2.50) & 199.95 (\(\pm\)2.14) c\({}_{2}\) & 356.03 (\(\pm\)14.23) & 22.51 (\(\pm\)0.21) & 1.11 (\(\pm\)0.08) b \\ \hline \end{tabular} Note: The different letter after \(D_{\
u 0.5}\) indicates a significant difference between different spray media under the same pressure (the letters a, b, c represent three pressures and the number subscripts 1, 2, 3, 4 represent 4 spraying media), and the different letter after \(Rs\) indicates a significant difference between the same column of data (\(p<0.05\)).  
\end{table} 
Table 2: Changes of nozzle droplet size distribution and relative droplet spectrum width under different spraying parameters. It can be seen from Table 2 that under the same spraying medium, as the pressure increases, \(D_{V0.1}\), \(D_{V0.5}\) and \(D_{V0.9}\) will become smaller, the value of \(\Phi_{V\!ol<\!150\ \upmu\mathrm{m}}\) will increase accordingly, but the relative droplet spectrum width \(R_{S}\) change little; When the spray pressure increases by 100% (from 0.2 MPa to 0.4 MPa), the volume medium diameter \(D_{V0.5}\) of the four spraying media decreases by 29.7%, 19.7%, 22.9% and 21.9%, respectively, \(\Phi_{V\!ol<\!150\ \upmu\mathrm{m}}\) increased by 42.2%, 24.6%, 29.7% and 83.2%. Spraying 10 g/L PEG-20,000 solution under three pressures, the volume medium diameter \(D_{V0.5}\) increased by 5.2%, 13% and 20% compared with clear water, and \(\Phi_{V\!ol<\!150\ \upmu\mathrm{m}}\) decreased by 4.9%, 11.5% and 16.7%; in the same way, spraying 20 g/L PEG-20,000 solution under three pressures, the volume medium diameter \(D_{V0.5}\) increased by 10.8%, 15.5% and 21.3%, \(\Phi_{V\!ol<\!150\ \upmu\mathrm{m}}\) reduced by 9.7%, 13.4% and 17.6%; spraying 30 g/L PEG-20,000 solution under three pressures, the volume medium diameter \(D_{V0.5}\) increased by 28.8%, 40.5% and 43%, and \(\Phi_{V\!ol<\!150\ \upmu\mathrm{m}}\) reduced by 67.4%, 65.6% and 58%.