LESによるプロペラファン空力騒音の予測(乱流の予測とモデリング(1),一般講演)

概要

論文の詳細を見る
In this paper, unsteady flow and aerodynamic noise are numerically investigated for a half-open type propeller fan used for outdoor air conditioner components. The flow field is calculated by Front Flow/Blue, which is based on Large Eddy Simulation (LES). The Standard Smagorinsky Model (SSM) and Dynamic Smagorinsky Model (DSM) were used as sub-grid scale models. Aerodynamic noise was calculated by Curle's equation based on the pressure fluctuation on the blade surface computed by LES. The computed static pressure rise of the fan showed reasonable agreement with the measured equivalent. The time-averaged distributions of the three velocity components downstream of the blades were also compared with those measured by hotwire anemometry, which showed satisfactory agreement between the computed and measured velocity profiles. Finally, the predicted far-field sound spectrum agrees reasonably well with measurements in a frequency range of 100 to 1kHz although the sound pressure level was underpredicted in the lower frequency range.
日本流体力学会の論文
2008-09-04