空調システムにおけるファンによる流体関連振動の研究

抄録

Many air conditioners use fan systems for heat exchange. Vibratory motion and noise in the conditioner occur when aerodynamic force of the rotating fan blades act on the cabinet of the air conditioner. Also, pressure variation of fan blade surface transmits to the motor-feet, and these transmitted forces excite support-structure of the motor. In the experimental apparatus of modeled air conditioner outdoor unit, we discussed the influence of the structure around the fan on the motor reaction forces. We also performed a computational fluid dynamics (CFD) analysis using fluid flow analysis software PHOENICS, and obtained pressure distribution near fan. Based on the calculation results of pressure distribution near fan, experimental results were considered. On the other hand, vibration response of bell mouth when aerodynamic force acts it was calculated using the finite element method.