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NAOSITE : Nagasaki University's Academic Output SITE > Faculty of Engineering > Bulletin > Reports of the Faculty of Engineering, Nagasaki University > Volume 37, No. 69 >


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Title: 円弧翼の後流特性に基づくファン騒音のスペクトル解析
Other Titles: Analysis of Fan Noise Spectrum Based onWake Characteristics of an Arc Blade
Authors: 佐々木, 壮一 / 林, 秀千人 / 佐藤, 大輔 / 奈須, 秀太朗
Authors (alternative): Sasaki, Soichi / Hayashi, Hidechito / Satoh, Daisuke / Nasu, Shutaro
Issue Date: Nov-2007
Publisher: 長崎大学工学部
Citation: 長崎大学工学部研究報告 Vol.37(69) p.1-7, 2007
Abstract: In this study, the wake characteristics of an arc blade were measured by means of a wind tunnel experiment; the characteristics were defined as the width of the wake, diameter of the vortex, ratio of the vortex structure, and local lift. The influence of the angle of attack on the aerodynamic noise of the blade was quantitatively predicted by using these characteristics. It was experimentally clarified that the ratio of the vortex structure was closely associated with the noise characteristics at a certain angle of attack. The wake characteristics were applied to the prediction of the broadband noise generated from a multiblade fan; the fan noise-level distribution was estimated with high accuracy to be in the range from 1000-3000 Hz and was used to analyze the broadband noise of the fan. From the comparison of the fan noise level, it was found that the difference in the relative velocity caused by the biased internal flow was related to the noise levels.
Keywords: Aerodynamic Noise / Wake / Vortex / Blade / Fan
URI: http://hdl.handle.net/10069/9457
Relational Links: http://www.lb.nagasaki-u.ac.jp/reports/kougaku/preview.php?id=47
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:Volume 37, No. 69

Citable URI : http://hdl.handle.net/10069/9457

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