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축류팬 팁 틈새와 유량이 공력 및 소음 특성에 미치는 영향에 관한 수치적 연구
조기영(Kiyeong Jo),한상욱(Sangwook Han),김형민(Hyung Min Kim),양시영(Siyoung Yang) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
The thermal management of the industrial and technical systems are the most important topic to increase the performance and energy efficiency of the system. The simplest way to cool the system is to use an axial fan, however another problem with improving the cooling performance is the fan noise caused by the airflow. And it is known that the noise intensity of the axial fan is affected by the tip clearance. In the research it has been performed a flow simulation with a rotating fan to determine the relationship between the noise and tip clearance. For the turbulent flow RANS, k-omega SST turbulence model has been applied and BNS model are applied to define the noise level by the flow. By comparing the performances of the axial fan as tip clearance varies from 1 to 3mm, it was verified that the flow rate at BEP is not coincides with the designed volume flow rate. In addition, it was confirmed that the acoustic power level increased as the tip clearance increased.