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NAOSITE : Nagasaki University's Academic Output SITE > Faculty of Engineering > Bulletin > Reports of the Faculty of Engineering, Nagasaki University > Volume 30, No. 55 >

チューブラー遠心送風機の入口偏流による干渉騒音の予測


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Title: チューブラー遠心送風機の入口偏流による干渉騒音の予測
Other Titles: Prediction of Interference Noise with Impeller and Inlet Distortion Flow of Tubular Centifugal Fan
Authors: 林, 秀千人 / 淵上, 真一郎 / 児玉, 好雄 / 三村, 雄次郎
Authors (alternative): Hayashi, Hidechito / Fuchigami, Shinichiro / Kodama, Yoshio / Mimura, Yujiro
Issue Date: Jul-2000
Citation: 長崎大学工学部研究報告 Vol.30(55) p.115-122, 2000
Abstract: The Characteristics of the periodic fluctuation of the tubular centrifugal fan were calculated by the discrete vortex method. By using the results, the interference noise caused by the interaction between the blade of impeller and the inlet distortion flow was predicted. It was pointed out that the fluctuations of the relative velocity at the inlet of impeller and the circulation around the blade have almost the same influence on the interference noise. The noise source is gathered near the leading edge of the blade. So the coefficient is introduced to use the averaged value of pressure fluctuation over the blade instead of the distributed noise source. The coefficient of averaging and the chord-wise correlation length do not varied with the degree of the distortion of the inlet flow. The interference noise levels by the prediction give good agreement with those by experiments. The inlet distortion flow has to be decreased under 1 percent to reduce the interference noise level to the turbulent noise level.
URI: http://hdl.handle.net/10069/5107
ISSN: 02860902
Type: Departmental Bulletin Paper
Appears in Collections:Volume 30, No. 55

Citable URI : http://hdl.handle.net/10069/5107

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