The Fundamentals of the Local Momentum Theory and Its Extension to a Distorted Wake Model of a Hovering Rotor

Material type: 規格・テクニカルリポート類

Author: 河内, 啓二ほか

Publisher: 航空宇宙技術研究所

Publication date: 1981-02

Material Format: Digital

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Note (General)：: 出版タイプ： NAThe fundamentals of the Local Momentum Theory (Azuma,A. and Kawachi,K.,“Local Momentum Theory and Its Application to the Rotary Wing”, Journa...

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Material Type: 規格・テクニカルリポート類
Title: The Fundamentals of the Local Momentum Theory and Its Extension to a Distorted Wake Model of a Hovering Rotor
Author/Editor: 河内, 啓二
KAWACHI, Keiji
Author Heading: KAWACHI, Keiji
Publication, Distribution, etc.: 航空宇宙技術研究所
Publication Date: 1981-02
Publication Date (W3CDTF): 1981
Alternative Title: 局所運動量理論とその変形後流モデルへの拡張
Periodical title: 航空宇宙技術研究所報告 = Technical Report of National Aerospace Laboratory TR-657
No. or year of volume/issue: 657
Volume: 657
Pages: 40-
ISSN (Periodical Title): ISSN : 0389-4010
Target Audience: 一般
Note (General): 出版タイプ： NA
The fundamentals of the Local Momentum Theory (Azuma,A. and Kawachi,K.,“Local Momentum Theory and Its Application to the Rotary Wing”, Journal of Aircraft, Vol.16, No.1, January 1979, pp.6-14) and a recent extension of this theory are presented in this report. The Local Momentum Theory is basd on the instantaneous balance between the fluid momentum and the blade elemental lift at a local station in the rotor rotational plane. Therefore, the theory has the capability of evaluating timewise variations of airloading and induced velocity distributions along a helicopter blade span. Unlike a complex vortex theory, this theory was developed to analyze the instantaneous induced velocity distribution effectively. This presentation of the fundamentals of the Local Momentum Theory makes clear the boundaries of this theory and assists in making a computer program using this theory. A new concept introduced into the theory in this report is the effect of the rotor wake contraction in hovering flight. A comparison of this extend Local Momentum Theory with a prescribed wake vortex theory is also presented. The results indicate that the extended Local Momentum Theory has the capability of achieving a level of accuracy similar to that of the prescribed wake vortex theory over wide range variations of rotor geometrical parameters. It is also shown that the analytical results obtained using either theory are in reasonable agreement with experimental data.
資料番号: NALTR0657000
レポート番号: NAL TR-657
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