DSpace university logo mark
Advanced Search
Japanese | English 

NAOSITE : Nagasaki University's Academic Output SITE > Faculty of Engineering > Bulletin > Reports of the Faculty of Engineering, Nagasaki University > Volume 34, No. 62 >

Turbulent Noise Generated by a Jet Fan

File Description SizeFormat
KJ00004724004.pdf742.4 kBAdobe PDFView/Open

Title: Turbulent Noise Generated by a Jet Fan
Authors: Kodama, Yoshio / Hayashi, Hidechito / Murayama, Masaru / Kondou, Shigeki / Yamaguchi, Hidenori / Ishida, Seiki
Authors (alternative): 児玉, 好雄 / 林, 秀千人 / 村山, 将 / 近藤, 重樹 / 山口, 英告 / 石田, 清輝
Issue Date: Jan-2004
Citation: 長崎大学工学部研究報告 Vol.34(62) p. 9-17, 2004
Abstract: There are two mechanisms giving rise to the dipole-type radiation of the turbulent noise generated from Jet fan. One is the strong turbulence induced by a front rotor which flows into the rear rotor, which, in tum, random force fluctuation on a rear rotor blade. Another is shedding of vortices from the trailing edge of the both front and rear rotors. In this paper, we take these two mechanisms into consideration to theoretically estimate the turbulent noise level. The estimated values agree well with the measured levels of turbulent noise generated by the Jet fan. It is theoretically clarified that the noise generated by the rear rotor is higher than that from the front rotor. The noise due to the turbulent flow is higher than that due to the vortex shedding from the trailing edge of the rotor.
Keywords: Fluid Machine / Fan / Turbulent Noise / Specific Noise Level / Acoustic Power
URI: http://hdl.handle.net/10069/14934
ISSN: 02860902
Type: Departmental Bulletin Paper
Appears in Collections:Volume 34, No. 62

Citable URI : http://hdl.handle.net/10069/14934

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