乱流斑点の相互干渉がその成長に及ぼす影響

概要

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Two turbulent spots were generated in a zero pressure gradient laminar boundary layer by issuing small air jets with a time interval T_d from two horizontally displaced holes on a flat plate and interaction phenomena between them were experimentally investigated. When the two spots were simultaneously generated (T_d=0), they merged into a larger single spot of which the normal growth was apparently enhanced and the velocity defect was intensified from the original spots in their merged region. The upstream spot generated with a time delay Td intruded into the calmed region of the downstream foregoing spot as it grew downstream. Then, its height was reduced and turbulence intensity was decreased, whereas it kept almost the same spanwise growth rate as that of the single spot. The normal growth of the downstream spot was scarcely affected by the intrusion of the upstream spot.
社団法人日本機械学会の論文
1999-02-25