DSpace university logo mark
Advanced Search
Japanese | English 

NAOSITE : Nagasaki University's Academic Output SITE > Faculty of Engineering > Bulletin > Reports of Graduate School of Engineering, Nagasaki University > Volume 42, No. 79 >


File Description SizeFormat
42_79_1.pdf2 MBAdobe PDFView/Open

Title: 多翼ファンの性能に及ぼすディフューザの影響
Other Titles: Influence of Diffuser on the Performance of a Forward Curved Fan
Authors: 佐々木, 壮一 / 鈴木, 康太 / 林, 秀千人
Authors (alternative): Sasaki, Soichi / Suzuki, Kota / Hayashi, Hidechito
Issue Date: Jul-2012
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, 42(79), pp.1-8; 2012
Abstract: In order to clarify the influence of the diffuser on the characteristics of a forward curved fan, the influence of bare ratio and outlet angle on the characteristics of the fan was discussed by the experiment of the actual fan and the numerical simulation. In the present paper, the mechanism of the discrete frequency noise generated due to the separated flow of the diffuser is reported. The optimized bare ratio was in the vicinity of 17 degrees. The fan separated inside of the diffuser generated the discrete frequency noise due to interaction between the reversed flow from the diffuser and the impeller rotating with the blade passing frequency. The efficient outlet angle existed within 10 degrees to 15 degree. The diffuser made by the outlet angle contributed for increasing the pressure ratio than that of the bare ratio. Furthermore, it was clarified that to restrain the separation in the diffuser is effective for decreasing the fan noise.
Keywords: Pressure Drop / Fan / Aerodynamic Noise / Internal Flow / Separation
URI: http://hdl.handle.net/10069/28906
ISSN: 18805574
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:Volume 42, No. 79

Citable URI : http://hdl.handle.net/10069/28906

All items in NAOSITE are protected by copyright, with all rights reserved.


Valid XHTML 1.0! Copyright © 2006-2015 Nagasaki University Library - Feedback Powerd by DSpace