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Experiments in a boundary layer subjected to free stream turbulence. Part 2. The role of TS-waves in the transition process

Published online by Cambridge University Press:  26 April 2006

A. V. Boiko ,
K. J. A. Westin ,
B. G. B. Klingmann ,
V. V. Kozlov  and
P. H. Alfredsson
A. V. Boiko
Affiliation:
Department of Theoretical and Applied Mechanics, Russian Academy of Sciences, Siberian Branch, 630090 Novosibirsk, Russia
K. J. A. Westin
Affiliation:
Department of Mechanics/Fluid Physics, Royal Institute of Technology, S-10044 Stockholm, Sweden
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 natural occurrence of Tollmien-Schlichting (TS) waves has so far only been observed in boundary layers subjected to moderate levels of free stream turbulence (Tu < 1%), owing to the difficulty in detecting small-amplitude waves in highly perturbed boundary layers. By introducing controlled oscillations with a vibrating ribbon, it is possible to study small-amplitude waves using phase-selective filtering techniques. In the present work, the effect of TS-waves on the transition is studied at Tu = 1.5%. It is demonstrated that TS-waves can exist and develop in a similar way as in an undisturbed boundary layer. It is also found that TS-waves with quite small amplitudes are involved in nonlinear interactions which lead to a regeneration of TS-waves in the whole unstable frequency band. This results in a significant increase in the number of turbulent spots, which promote the onset of turbulence.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 281 , 25 December 1994 , pp. 219 - 245
Copyright
© 1994 Cambridge University Press

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