# CFD Analysis and Validation of a Foreign Material Winnowing Machine for Pepper Harvester
## 3 Results and Discussion
### Results of Comparing Winnower Speed Measurement and Flow Analysis
Figure 10: Results of actual measurement for wind velocity on conditions of 0-guide (**a**), 3-guide (**b**), and 5-guide (**c**) at 1600 RPM, 0-guide (**d**), 3-guide (**e**), 5-guide (**f**) at 1800 RPM, and 0-guide (**g**), 3-guide (**h**), 5-guide (**i**) at 2000 RPM. Figure 11: Results of CFD analysis for wind velocity on conditions of 0-guide (**a**), 3-guide (**b**), 5-guide (**c**) at 1600 RPM, and 0-guide (**d**), 3-guide (**e**), 5-guide (**f**), at 800 RPM, and 0-guide (**g**), 3-guide (**h**), 5-guide (**i**) at 2000 RPM. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \begin{tabular}{c} **Shape of** \\ **Winnowing** \\ **Machine** \\ \end{tabular} & \begin{tabular}{c} **Distance** \\ **(mm)** \\ \end{tabular} & \begin{tabular}{c} **Rotating** \\ **Speed** \\ **(RPM)** \\ \end{tabular} & \begin{tabular}{c} **L1** \\ **(m/s)** \\ \end{tabular} & \begin{tabular}{c} **C1** \\ **(m/s)** \\ \end{tabular} & \begin{tabular}{c} **R1** \\ **(m/s)** \\ \end{tabular} & \begin{tabular}{c} **L1** \\ **(m/s)** \\ \end{tabular} & \begin{tabular}{c} **C1** \\ **(m/s)** \\ \end{tabular} & \begin{tabular}{c} **R1** \\ **(m/s)** \\ \end{tabular} \\ \hline \multirow{6}{*}{\begin{tabular}{c} Existing \\ winnowing \\ machine \\ (0-guide) \\ \end{tabular} } & \multirow{4}{*}{0} & 1600 & 3.3 & 19.8 & 3.6 & 4.1 & 19.9 & 4.4 \\  & & 1800 & 3.7 & 21.6 & 4.2 & 4.9 & 22.6 & 5.0 \\  & & 2000 & 4.9 & 22.7 & 4.7 & 5.8 & 24.1 & 5.8 \\ \cline{2-8}  & & 1600 & 12.6 & 17.0 & 13.4 & 13.8 & 17.6 & 14.3 \\  & & 1800 & 15.3 & 20.6 & 14.8 & 16.9 & 21.4 & 16.2 \\  & & 2000 & 16.3 & 20.5 & 16.6 & 17.5 & 23.2 & 18.4 \\ \cline{2-8}  & & 1600 & 10.6 & 15.2 & 11.4 & 11.1 & 15.5 & 12.2 \\  & & 1800 & 13.4 & 18.4 & 13.7 & 13.8 & 19.1 & 14.6 \\  & & 2000 & 14.6 & 18.5 & 15.4 & 15.0 & 19.6 & 15.8 \\ \hline \multirow{6}{*}{\
\begin{tabular}{c} Winnowing \\ machine with three \\ wind guides \\ (3-guide) \\ \end{tabular} } & \multirow{4}{*}{0} & 1600 & 14.9 & 16.1 & 15.6 & 15.6 & 17.7 & 16.2 \\  & & 1800 & 21.9 & 19.5 & 23.9 & 22.3 & 20.6 & 24.0 \\  & & 2000 & 23.4 & 22.1 & 25.8 & 24.4 & 22.9 & 26.8 \\ \cline{2-8}  & & 1600 & 17.3 & 13.6 & 17.8 & 17.5 & 13.9 & 18.3 \\  & & 1800 & 17.3 & 17.2 & 17.6 & 18.9 & 17.8 & 19.2 \\  & & 2000 & 19.5 & 17.2 & 18.0 & 21.1 & 19.3 & 20.0 \\ \cline{2-8}  & & 1600 & 11.2 & 12.1 & 10.6 & 12.1 & 12.6 & 12.4 \\  & & 1800 & 12.1 & 13.8 & 11.0 & 13.3 & 14.3 & 13.1 \\  & & 2000 & 13.3 & 15.6 & 12.1 & 15.4 & 15.8 & 13.9 \\ \hline \multirow{6}{*}{
\begin{tabular}{c} Winnowing \\ machine with five \\ wind guides \\ (S-guide) \\ \end{tabular} } & \multirow{4}{*}{0} & 1600 & 15.0 & 15.3 & 14.4 & 14.2 & 15.5 & 14.8 \\  & & 1800 & 17.0 & 18.9 & 13.9 & 17.5 & 19.4 & 15.9 \\ \cline{1-1}  & & 2000 & 17.7 & 17.9 & 16.4 & 19.0 & 18.6 & 18.2 \\ \cline{1-1} \cline{2-8}  & & 1600 & 13.6 & 14.2 & 13.9 & 13.8 & 16.1 & 14.4 \\ \cline{1-1}  & & 1800 & 14.4 & 15.4 & 14.7 & 15.0 & 16.2 & 16.8 \\ \cline{1-1}  & & 2000 & 18.9 & 16.1 & 16.1 & 19.5 & 18.0 & 18.3 \\ \cline{1-1} \cline{2-8}  & & 1600 & 12.5 & 12.2 & 10.9 & 13.2 & 12.6 & 12.3 \\ \cline{1-1}  & & 1800 & 12.4 & 14.3 & 13.1 & 14.8 & 15.6 & 15.1 \\ \cline{1-1}  & & 2000 & 15.1 & 16.1 & 16.7 & 16.1 & 17.0 & 17.3 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Experimental results of wind speed by the shape of the winnowing machine and measurement position.