Secondary motion and turbulence of the flow through a circular .PI.-curved bent tube and a S-duct.

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  • 円形返しベンドおよびＳ字形流路内乱流の二次流れと乱れ
  • エンケイ カエシ ベンド オヨビ S ジガタ リュウロナイ ランリュウ ノ 2

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Abstract

Time-averaged velocities of axial and secondary flow components and a turbulent intensity were measured by the hot-wire anemometer in a developing flow through a π bent tube or S-duct composed of two π/2 bent tubes. In the π-bend, the secondary motion is intensified behind the inlet to it and weakened at its outlet. The secondary flow grows rather in the hind bend of the S-duct than in the fore one, though the centrifugal force is in the opposite direction in the two bend. The turbulence intensity is larger near the inner wall than that near the outer wall in the hind bend.

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