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  1. B200 工学部/工学研究科
  2. B200a 雑誌掲載論文
  3. 学術雑誌

On the Development of Coherent Structure in a Planet Jet (Part 3, Multi-Point Simultaneous Measurement of Main Streamwise Velocity and the Reconstruction of Velocity Field by the KL Expansion)

http://hdl.handle.net/2237/9008
78c28ef0-bb0b-4733-8e43-d0ae8d53a72a
名前 / ファイル ライセンス アクション
JsMecEngB-49-3-722.pdf JsMecEngB-49-3-722.pdf (1.2 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2007-11-15
タイトル
タイトル On the Development of Coherent Structure in a Planet Jet (Part 3, Multi-Point Simultaneous Measurement of Main Streamwise Velocity and the Reconstruction of Velocity Field by the KL Expansion)
著者 SAKAI, Yasuhiko

× SAKAI, Yasuhiko

WEKO 20224

SAKAI, Yasuhiko

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TANAKA, Nobuhiko

× TANAKA, Nobuhiko

WEKO 20225

TANAKA, Nobuhiko

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YAMAMOTO, Mutsumi

× YAMAMOTO, Mutsumi

WEKO 20226

YAMAMOTO, Mutsumi

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KUSHIDA, Takehiro

× KUSHIDA, Takehiro

WEKO 20227

KUSHIDA, Takehiro

Search repository
権利
権利情報 日本機械学会
権利
権利情報 本文データは学協会の許諾に基づきCiNiiから複製したものである。
キーワード
主題Scheme Other
主題 Jet
キーワード
主題Scheme Other
主題 Turbulence
キーワード
主題Scheme Other
主題 Vortex
キーワード
主題Scheme Other
主題 Flow Measurements
キーワード
主題Scheme Other
主題 Spatial Velocity Correlation
キーワード
主題Scheme Other
主題 Karhunen Loève Expansion
キーワード
主題Scheme Other
主題 Coherent Structure
キーワード
主題Scheme Other
主題 Flapping Phenomenon
抄録
内容記述 In order to clarify the dynamics of the coherent structure in a turbulent plane jet, the simultaneous measurement of the main streamwise velocity at 21 points in the self-preserving region of a turbulent plane jet has been performed by an array of I-type hot-wire probes. Then the KL (Karhunen-Loève) expansion was applied to extract the coherent structure in the jet. The total number of eigenfunctions (modes) is N=21, which corresponds to the number of probes. The eigenfunctions (modes) are numbered in order of magnitude of their corresponding eigenvalues. From the investigation of the random coefficients and the eigenfunctions (modes), it is found that the low-numbered (energetic) modes represent the large scale(coherent) structure, the middle-numbered modes represent the finer (small-scale) random structure, and the higher-numbered modes contribute mainly to the intermittent structure in the outer edge region. From the spatio-temporal velocity field reconstructed by the first KL mode, it is found that there exist a pair of fluid lumps with the positive and negative streamwise velocity fluctuation on the opposite sides of the jet centerline, and the signs of velocity fluctuation for those fluid lumps change alternately as time proceeds. These characteristics are consistent with the so called “jet flapping” phenomenon.
内容記述タイプ Abstract
出版者
出版者 The Japan Society of Mechanical Engineers
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
関連情報
関連タイプ isVersionOf
関連識別子
識別子タイプ URI
関連識別子 http://ci.nii.ac.jp/naid/110004773146/
ISSN
収録物識別子タイプ ISSN
収録物識別子 1340-8054
書誌情報 JSME International Journal Series B

巻 49, 号 3, p. 722-730, 発行日 2006-08
フォーマット
application/pdf
著者版フラグ
値 publisher
URI
識別子 http://hdl.handle.net/2237/9008
識別子タイプ HDL
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