円管助走部流れにおける孤立乱流塊の実験的観察(安定性・乱流安定性(2),一般講演)

概要

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Laminar-Turbulent transition of a boundary layer forced by a jet in the inlet region of a circular pipe was experimentally investigated. The jet was inserted radially from a small hole in the inlet region into the pipe flow periodically. Isolated turbulence patches were formed from the jets, then they propagated downstream. The contour lines of the intermittency were drawn. The jet reached the central region of the pipe, then damped and disappeared as goes downstream. The jet induced a turbulent patch near the wall. The turbulent patch growed in the axial, radial and peripheral directions. The patch penetrated the boundary layer, then reached the core region. The propagation velocities of the leading and trailing edges of the patch were almost same as those of turbulent slugs in low Reynolds numbers.
日本流体力学会の論文
2009-09-02