A study in transitional flat plate boundary layers: measurement and visualization |
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| Authors: | C. B. Lee Z. X. Hong Y. S. Kachanov V. I. Borodulin V. V. Gaponenko |
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| Affiliation: | (1) Laboratory of Fluid Mechanics Department of Engineering Mechanics Tsinghua University, Beijing 100084, P.R. China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences, Beijing 100029, P.R. China State Key Laboratory of Turbulence Research of Beijing University Beijing 100871, P.R. China, CN;(2) State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Science, Beijing 100029, P.R. China, CN;(3) Institute of Theoretical and Applied Mechanics Russian Academy of Sciences Novosibirsk 630090, Russia, RU |
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| Abstract: | This study is concerned with transition in flat plate boundary layer flow. Sets of results are obtained as follows: (1) Very clear pictures of the formation and the development of the butterfly-like structures rather than ∧-structures in the K-regime of boundary layer transition are obtained. (2) A chain of ring like vortices, which generate the high-frequency spikes on the time traces of velocity and still present periodical behaviour, at the tip of each ∧-vortex, which is the part of the butterfly-like structure, are visualized for the first time. (3) A wave-like structure is observed to occupy the whole boundary layer, extending from the near-wall region to the outer edge of the boundary layer. Received: 24 September 1998/Accepted: 24 April 1999 |
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