Summary
Results from an experimental study of the development of turbulent spots in plane Poiseuille flow is presented. Spots were triggered at a Reynolds number of 1600 by a loudspeaker-induced jet of high velocity. The initial disturbance was found to undergo a first stage of rapid expansion, in which sharp internal shear layers form, and subsequently break down to turbulence. This was first observed at locations away from the symmetry plane. After an initial development phase the spot gets a self-similar shape. Oblique Tollmien-Schlichting waves were found at the wing-tips of the spot, where they reach amplitudes of more than 15% of the undisturbed centreline velocity.
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© 1990 Springer-Verlag Berlin Heidelberg
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Klingmann, B., Alfredsson, P.H. (1990). On the Development of Turbulent Spots in Plane Poiseuille Flow. In: Arnal, D., Michel, R. (eds) Laminar-Turbulent Transition. International Union of Theoretical and Applied Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-84103-3_3
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DOI: https://doi.org/10.1007/978-3-642-84103-3_3
Publisher Name: Springer, Berlin, Heidelberg
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