不等ピッチで高速回転するファンの音響特性と空力性能

Material type: 規格・テクニカルリポート類

Author: 藤井, 昭一ほか

Publisher: 航空宇宙技術研究所

Publication date: 1977-02

Material Format: Digital

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Note (General)：: 出版タイプ： NAThis paper describes an experimental measurement of the effects of uneven blade spacing on the acoustic and aero-thermodynamic characteristic...

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Material Type: 規格・テクニカルリポート類
Title: 不等ピッチで高速回転するファンの音響特性と空力性能
Author/Editor: 藤井, 昭一
西脇, 英夫
武田, 克巳
FUJII, Shoichi
NISHIWAKI, Hideo
TAKEDA, Katsumi
Author Heading: FUJII, Shoichi
NISHIWAKI, Hideo
TAKEDA, Katsumi
Publication, Distribution, etc.: 航空宇宙技術研究所
Publication Date: 1977-02
Publication Date (W3CDTF): 1977
Alternative Title: Acoustics and Performance of High-Speed, Unequally Spaced Fan Rotors
Periodical title: 航空宇宙技術研究所報告 = Technical Report of National Aerospace Laboratory TR-526
No. or year of volume/issue: 526
Volume: 526
Pages: 19-
ISSN (Periodical Title): ISSN : 0389-4010
Target Audience: 一般
Note (General): 出版タイプ： NA
This paper describes an experimental measurement of the effects of uneven blade spacing on the acoustic and aero-thermodynamic characteristics of high-speed, high-pressure-ratio fan rotors at two selected spacing configurations. A test rig, consisting of inlet guide vanes and transonic rotor blades, was employed to explore the redistribution of harmonic sound energy into a series of multiple tones of lower sound pressure level. The measured data indicated that a 10％ modulated rotor exhibited a six to eight decibel decrease in the sound pressure level as compared with the original first blade passage frequency harmonic. Disadvantages in aerodynamic performance resulting from spacing modulation were not so unfavourable for 10％ modulated blades. However, with 5％ modulated blades, serious deterioration in aerodynamic performance was observed particularly near the blade tip section, which produced an unfavourable acoustic signature. A calculation method, assuming a pulse event for each blade sound pressure, provided agreeable results with the measured data.
資料番号: NALTR0526000
レポート番号: NAL TR-526
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 宇宙航空研究開発機構 : 宇宙航空研究開発機構リポジトリ