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セレーション平板翼の空力騒音低減効果


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Title: セレーション平板翼の空力騒音低減効果
Other Titles: Effect of Reduction on Aerodynamic Noise of a Serrated Plate Blade
Authors: 佐々木, 壮一 / 奈須, 秀太朗 / 林, 秀千人
Authors (alternative): Sasaki, Soichi / Nasu, Shutaroh / Hayashi, Hidechito
Issue Date: Feb-2008
Publisher: 長崎大学工学部
Citation: 長崎大学工学部研究報告 Vol.38(70) p.1-6 2008
Abstract: In this study, the wake characteristics and the aerodynamic noise generated from a plate blade immersed in the uniform flow was measured by wind tunnel, moreover, the effect of reduction on the noise according to addition of serration was analyzed based on the prediction equation of the discrete frequency noise. The discrete frequency noise of the serrated plate blade on the leading edge became 6.2dB smaller than the flat plate blade. The serrated plate blade reduced the velocity gradient to the main flow direction in the wake than that of the flat plate blade. It is considered that the strength of the velocity fluctuation at vicinity of the trailing edge of the serrated plate blade became small because of the slow of the velocity gradient. From analysis on the wake characteristics, since it is not only reducing the scale of the wake vortex but also diminishing the potential of the vortex, it clarified that to add of the serration to the leading edge on the plate blade is effective.
Keywords: Aerodynamic Noise / Blade / Wake Characteristic / Vortex / Wind Tunnel
URI: http://hdl.handle.net/10069/16938
Relational Links: http://www.lb.nagasaki-u.ac.jp/reports/kougaku/preview.php?id=53
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:Volume 38, No. 70

Citable URI : http://hdl.handle.net/10069/16938

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