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NAOSITE : Nagasaki University's Academic Output SITE > Faculty of Engineering > Bulletin > Reports of Graduate School of Engineering, Nagasaki University > Volume 43, No. 81 >


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Title: プロペラファンの翼端渦と空力騒音に関する研究(軸方向相対位置の影響)
Other Titles: Study of Blade Tip Vortex and Aerodynamic Noise of a Propeller Fan (Influence of Axial-direction Relative Position)
Authors: 佐々木, 壮一 / 鳥瀬, 一貴 / 村上, 寛明
Authors (alternative): Sasaki, Soichi / Torise, Ikki / Murakami, Hiroaki
Issue Date: Jul-2013
Publisher: 長崎大学大学院工学研究科 / Graduate School of Engineering, Nagasaki University
Citation: 長崎大学大学院工学研究科研究報告, 43(81), pp.1-6; 2013
Abstract: The objective of this study is to clarify the relationship between the tip vortex and aerodynamic noise of an open type propeller fan operating at the vicinity of the maximum efficiency point. The influence of the internal flow on the aerodynamic noise is discussed with taking account of the axial direction relative position. In this experiment, when the relative position is 20 mm, the periodical noise at 200 Hz which is the low frequency side than that of the blade passing frequency became large. The periodical noise became the one of the important factors for increasing the fan noise by 5dB. The periodical noise was generated by the interaction between the tip vortex and the partition of the fan. It was clarified that when the wake formed the flow regime of the high specific speed type impeller the blade tip vortex noise was generated.
Keywords: fan / turbomachinery / tip vortex / aerodynamic noise / wake / velocity distribution
URI: http://hdl.handle.net/10069/33815
ISSN: 18805574
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:Volume 43, No. 81

Citable URI : http://hdl.handle.net/10069/33815

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