2021 Volume 38 Issue 1 Pages 21-
Many air conditioners use fan systems for heat exchange. Vibratory motion and noise in the air conditioner occur when the aerodynamic pressure pulsation by the rotating fan blades act on the cabinet of the air conditioner. On the other hand, reaction force corresponding to the cabinet pressure pulsation occurs, and then the cabinet pressure pulsation transmitted to the motorfeet. Finally, these transmitted forces excite support-structure of the motor. We calculated the cabinet pressure pulsation and pressure fluctuation on fan blades by CFD software “PHOENICS” and we also calculated the reaction force, using the results of CFD analysis. Calculation results of the cabinet pressure pulsation and reaction force were compared with the measured value by the testing system. We found that the calculation result agrees with experimental result.
