二次元噴流のコヒーレント構造発展に関する実験的研究（第４報，速度二成分多点同時測定とＫＬ展開による大スケール構造モデル）

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書誌事項

タイトル別名
  • An Experimental Study on the Development of Coherent Structure in a Plane Jet (4th Report, Multi-point Simultaneous Measurement of Two Velocity Components and the Large-scale Structure Model by the KL Expansion)
  • 2ジゲン フンリュウ ノ コヒーレント コウゾウ ハッテン ニ カンスル ジッケンテキ ケンキュウ ダイ4ホウ ソクド 2セイブン タテン ドウジ ソクテイ ト KL テンカイ ニ ヨル ダイ スケール コウゾウ モデル
  • 4th Report, Multi-point Simultaneous Measurement of Two Velocity Components and the Large-scale Structure Model by the KL Expansion
  • 第4報, 速度二成分多点同時測定とKL展開による大スケール構造モデル

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In order to clarify the large-scale coherent structure in a turbulent plane jet, the simultaneous measurement of the main streamwise and the cross-streamwise velocity at 9 points in the self-preserving region of a turbulent plane jet has been preformed by an array of X-type hot wire probes. From the time variation of the main streamwise fluctuating velocity field, it is found that there exist a pair of fluid lumps with the positive and negative fluctuating velocity on opposite sides of the jet centerline. On the other hand, the instantaneous cross-streamwise fluctuating velocity shows the same sign over the cross-section, i.e., the vertically-striped pattern is formed. As the result of the KL expansion, it is found hat the first u and v modes present a character of the “flapping”, and the second and third modes show the one of the “puffing”. From the combination of the “flapping” and the “puffing”, a new coherent structure model in the self-preserving region of a turbulent plane jet has been developed.

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