放射状液膜流れの乱流斑点に随行する斜行T-S波

Material type: 文書・図像類

Author: 東, 恒雄ほか

Publisher: 航空宇宙技術研究所

Publication date: 2000-12

Material Format: Digital

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Note (General)：: 27-28 Sept. 1999 (25th). 27-28 Mar. 2000 (26th)放射状薄液膜流れの層流域に生成する単離乱流斑点周辺の一組の斜行T-S(Tollmien-Schlichting)波の波束を検討した。液膜流れは鉛直円管の先端と水平に置いた円盤の表面との間の薄い円筒状隙間から...

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Material Type: 文書・図像類
Title: 放射状液膜流れの乱流斑点に随行する斜行T-S波
Author/Editor: 東, 恒雄
Azuma, Tsuneo
Author Heading: 東, 恒雄
Azuma, Tsuneo
Publication, Distribution, etc.: 航空宇宙技術研究所
Publication Date: 2000-12
Publication Date (W3CDTF): 2000-12
Alternative Title: Packets of oblique T-S waves trailing a turbulent spot in a radial liquid film flow
Periodical title: 航空宇宙技術研究所特別資料 = Special Publication of National Aerospace Laboratory
No. or year of volume/issue: 47
Volume: 47
Pages: 25-28
ISSN (Periodical Title): ISSN : 0289-260X
Text Language Code: jpn
Subject Heading: 斜行T-S波
Tollmien-Schlichiting
波束
乱流斑点
放射状液膜流れ
層流域
群速度
位相速度
遷移
安定性
数値シミュレーション
斜行撹乱波
oblique TS wave
Tollmien Schlichting
wave packet
turbulent spot
radial liquid film flow
laminar region
group velocity
phase velocity
transition
stability
numerical simulation
oblique disturbance wave
Target Audience: 一般
Note (General): 27-28 Sept. 1999 (25th). 27-28 Mar. 2000 (26th)
放射状薄液膜流れの層流域に生成する単離乱流斑点周辺の一組の斜行T-S(Tollmien-Schlichting)波の波束を検討した。液膜流れは鉛直円管の先端と水平に置いた円盤の表面との間の薄い円筒状隙間から大気中に水を放出して形成した。乱流斑点は円盤の小孔から層流域へパルス状の噴流を吹き出して作り、高速写真を使って観察した。斑点の強力な乱流は斑点の両面上に一組の斜行波束を発生させ、増幅した波束は新たな微細乱流に向かってブレークダウンした。波束群速度は斜行T-S波の位相速度の1.4倍であり、通常の同心円状T-S波の位相速度に等しい。
A pair of wave packets of oblique T-S (Tollmien-Schlichting) waves around an isolated turbulent spot, which was produced in the laminar region of a thin radial liquid film flow, was investigated. The liquid film flow was formed by a water discharge to the atmosphere from a thin cylindrical gap between the end of a vertical pipe and the surface of a horizontally placed flat disk. The turbulent spot was created by a pulse-like jet injection into the laminar region through a small hole in the disk, observed by high-speed photography. The strong turbulence of the spot generates a pair of oblique wave packets on both sides of the spot, and the amplified wave packets break down into new turbulent patches. The group velocity of the wave packet is 1.4 times the phase velocity of oblique T-S wave which is equal to that of the ordinary concentric T-S wave.
資料番号: AA0028636008
レポート番号: NAL SP-47
Access Restrictions: 限定公開
Periodical Title (NCID): AN10097345
https://ci.nii.ac.jp/ncid/AN10097345
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