流体工学部門講演会講演論文集
Online ISSN : 2424-2896
セッションID: 0204
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0204 規則配置溝列により撹乱を受けた円管内乱流(OS2-1 乱流の計測・解析・制御,オーガナイズドセッション)
宇都宮 浩司永原 幸司川向 伸哉中西 助次大坂 英雄
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会議録・要旨集 フリー

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Measurements were made of the response of a turbulent pipe flow to a short length (about eight pipe radius) of surface roughness. A ring-type groove has a rectangular square cross-section of 3mm which is a height of 0.075 times the pipe radius, and the pitch to height ratio is equal to 2. The measurements include the wall static pressure and mean velocity. At the measurement station, 40 pipe radius from the roughness, mean velocity field had relaxed to the universal smooth-wall structure. Present flow field disturbed by a short length roughness was weakly affected as compared with the case of a ring type manipulator.

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