Abstract
Acoustic receptivity was experimentally examined for a Blasius boundary layer with receptivity sites in the form of 2-D waviness and oblique waviness. Linear receptivity coefficients obtained for all values of forcing combinations (є · Δh) are in good agreement with receptivity theory. The measured receptivity increased markedly with increasing wave obliqueness. Detuning was investigated by varying the streamwise wavenumber, α w , of the 2-D and oblique wall waviness. Oblique transition was also investigated by exciting a pair of oblique Orr-Sommerfeld (O-S) modes (f / f o ,±β / β w ) = (1,±1). For large values of є · Δh, a secondary instability was observed that ultimately lead to laminar breakdown. This instability appears to be driven by large spanwise velocity gradients, |dU/dζ|.
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© 2000 Springer-Verlag Berlin Heidelberg
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King, R.A., Breuer, K.S. (2000). Non-localized acoustic receptivity and subsequent disturbance growth in a Blasius boundary layer. In: Fasel, H.F., Saric, W.S. (eds) Laminar-Turbulent Transition. IUTAM Symposia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-03997-7_9
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DOI: https://doi.org/10.1007/978-3-662-03997-7_9
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