A123 シャープターンをもつ正方形断面流路内の流れ特性

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  • Flow Characteristics in a Square-Sectioned Duct with a Sharp Turn
  • シャープターン オ モツ セイホウケイ ダンメン リュウロ ナイ ノ ナガレ トクセイ

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This paper presents an experimental study of turbulent flow through a squared-sectioned duct with a 180-deg sharp turn. Fluid flow fields are investigated using a laser-Doppler velocimetry, PIV and a visualization method. The mean velocity features of the primary and secondary flows, and the fluctuating longitudinal-velocity at a Reynolds number of 3×104 are illustrated in the form of a contour map. Moreover, the mean quantities characterizing the turning flow, such as deviation of the primary flow and the intensity of turbulence, are shown in a graphic form against the longitudinal distances. Simultaneously, discussions are given on the transition of phenomena in the longitudinal direction.

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