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Experiments in a boundary layer subjected to free stream turbulence. Part 1. Boundary layer structure and receptivity

Published online by Cambridge University Press:  26 April 2006

K. J. A. Westin ,
A. V. Boiko ,
B. G. B. Klingmann ,
V. V. Kozlov  and
P. H. Alfredsson
K. J. A. Westin
Affiliation:
Department of Mechanics/Fluid Physics, Royal Institute of Technology, S-10044 Stockholm, Sweden
A. V. Boiko
Affiliation:
Department of Theoretical and Applied Mechanics, Russian Academy of Sciences, Siberian Branch, 630090 Novosibirsk, Russia
B. G. B. Klingmann
Affiliation:
Department of Mechanics/Fluid Physics, Royal Institute of Technology, S-10044 Stockholm, Sweden Present address: Volvo Aerospace Corp., Space Propulsion Division, S-461 81 Trollhättan, Sweden.
V. V. Kozlov
Affiliation:
Department of Theoretical and Applied Mechanics, Russian Academy of Sciences, Siberian Branch, 630090 Novosibirsk, Russia
P. H. Alfredsson
Affiliation:
Department of Mechanics/Fluid Physics, Royal Institute of Technology, S-10044 Stockholm, Sweden
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Abstract

The modification of the mean and fluctuating characteristics of a flat-plate boundary layer subjected to nearly isotropic free stream turbulence (FST) is studied experimentally using hot-wire anemometry. The study is focussed on the region upstream of the transition onset, where the fluctuations inside the boundary layer are dominated by elongated flow structures which grow downstream both in amplitude and length. Their downstream development and scaling are investigated and the results are compared with those obtained by previous authors. This allows some conclusions about the parameters which are relevant for the modelling of the transition process. The mechanisms underlying the transition process and the relative importance of the Tollmien–Schlichting wave instability in this flow are treated in an accompanying paper (part 2 of the present report).

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 281 , 25 December 1994 , pp. 193 - 218
Copyright
© 1994 Cambridge University Press

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