| Title |
Effect of Pitch Angle and Blade Length on an Axial Flow Fan Performance |
| Authors |
전성택(Sung-Taek Jeon) ; 조진표(Jin-Pyo Cho) |
| DOI |
http://dx.doi.org/10.6110/KJACR.2013.25.1.043 |
| Keywords |
축류팬 ; 피치각 ; 정압 Axial flow fan ; Pitch angle ; Static pressure |
| Abstract |
In this study, the performance of an impeller according to blade length and pitch angle was studied experimentally by building a variable pitch impeller while changing blade length to review the effect of blade length and pitch angle on a fan’s performance. The pitch angle was changed in six steps from 20°～45° at intervals of 5° while the blade lengths were changed to 90 mm, 100 mm, 110 mm and 120 mm with an identical airfoil shape while carrying out the experiment. The results are summarized as follows: The air flow per static pressure of axial fans increased linearly with increase of pitch angle, but the high static pressure showed a decrease at a pitch angle of 35°. The shaft power increased proportionally to the pitch angle at all blade lengths; the larger the pitch angle, the larger the measured increase of shaft power. This is because the drag at the fan’s front increases with the pitch angle. In the axial fans considered in this research, the flow and increase of static pressure amount increased up to a pitch angle of 30° but decreased rapidly above 35°. |