2713 細孔を持つ表面インピーダンスへのグレージング効果 : 矩形孔の場合(J20-3 流体関連の騒音と振動(3) 流れの制御と騒音,ジョイントセッション,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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Introduction of perforations in the wall of flow surface causes significant reduction of aerodynamic sound radiation from a rotating wing. In order to enjoy the largest advantage of perforated surface, the optimal distribution of finite impedance should be realized, which means the impedance characteristics of the surface must be predicted under the grazing flow condition. In this paper grazing flow effect on the surface impedance was investigated by a numerical simulation, where the diameter is 1mm and the Reynolds number based on the diameter ranges from 0 to 160. The complex surface impedance ratio marks far larger magnitude over low frequency range than the conventional impedance for larger diameters and higher Reynolds number, which reflects the effect of high viscosity of the flow. On the other hand, for the higher frequency range the impedance becomes comparable with the conventional impedance
社団法人日本機械学会の論文
2008-08-02