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多翼ファンの空力音源に及ぼす舌部隙間流れの影響


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Title: 多翼ファンの空力音源に及ぼす舌部隙間流れの影響
Other Titles: Influence of Tongue Clearance Flow on Aerodynamic Noise Source of a Forward Curved Fan
Authors: 佐々木, 壮一 / 黒田, 晃伸 / 林, 秀千人
Authors (alternative): Sasaki, Soichi / Kuroda, Akinobu / Hayashi, Hidechito
Issue Date: Jan-2011
Publisher: 長崎大学工学部 / Faculty of Engineering, Nagasaki University
Citation: 長崎大学工学部研究報告, 41(76), pp.7-12; 2011
Abstract: A visualization method of aerodynamic noise source based on momentum in wake of a centrifugal impeller is proposed. The characteristics of the fan noise operated at the design point and the off design point are discussed by the visualization. When the flow rate changed from the design point to the off design point, the overall noise level of the fan has increased by 3 dB (A) because of the broadband noise. According to the visualization of aerodynamic noise source proposed by this study, it clarified that the domain of the flow related to the fan noise exists at the vicinity of the volute tongue. Since the flow almost flows out to the exit of the fan at the off-design, the large difference of the momentum in the wake occurred at the vicinity of the volute tongue. It is shown that the flow pattern at the vicinity of the volute tongue is one of the reasons for increasing of the fan noise.
Keywords: Fan / Aerodynamic Noise / Wake / Numerical Simulation / Fluid Force
URI: http://hdl.handle.net/10069/24629
ISSN: 18805574
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:Volume 41, No. 76

Citable URI : http://hdl.handle.net/10069/24629

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