著者

児玉 好雄 林 秀千人 村山 将 近藤 重樹 山口 英告 石田 清輝

出版者

長崎大学

雑誌

長崎大学工学部研究報告 (ISSN:02860902)

巻号頁・発行日

vol.34, no.62, pp.9-17, 2004-01

被引用文献数

1

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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.