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Secondary instability of a swept-wing boundary layer disturbed by controlled roughness elements

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Abstract

Wind-tunnel data on velocity perturbations evolving in a laminar swept-wing flow under low subsonic conditions are reported. The focus of the present experiments are secondary disturbances of the boundary layer which is modulated by stationary streamwise vortices. Both the stationary vortices and the secondary oscillations of interest are generated in a controlled manner. The experimental data are obtained through hot-wire measurements. Thus, evolution of the vortices, either isolated or interacting with each other, is reconstructed in detail. As is found, the secondary disturbances, initiating the laminar-flow breakdown, are strongly affected by configuration of the stationary boundary-layer perturbation that may have an implication to laminar–turbulent transition control.

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Acknowledgments

V.V.K. would like to thank Chalmers University of Technology for hosting him during his research visits when this work was carried out. The present study was also supported by President of Russian Federation (NSh-454.2008.1), the Russian Foundation for Basic Research (Grant No 08-01-00027) and the Ministry of Education and Science of Russian Federation (Project RNP 2.1.2.541).

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Authors and Affiliations

  1. Chalmers University of Technology, 412 96, Göteborg, Sweden

    V. G. Chernoray & L. Löfdahl

  2. Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, 630090, Russia

    A. V. Dovgal & V. V. Kozlov

Authors
  1. V. G. Chernoray
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  2. A. V. Dovgal
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  3. V. V. Kozlov
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  4. L. Löfdahl
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Correspondence to A. V. Dovgal.

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Chernoray, V.G., Dovgal, A.V., Kozlov, V.V. et al. Secondary instability of a swept-wing boundary layer disturbed by controlled roughness elements. J Vis 13, 251–256 (2010). https://doi.org/10.1007/s12650-010-0035-0

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  • DOI: https://doi.org/10.1007/s12650-010-0035-0

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