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Receptivity coefficients at excitation of cross-flow waves due to scattering of free-stream vortices on surface vibrations

Published online by Cambridge University Press:  14 March 2016

V. I. Borodulin ,
A. V. Ivanov ,
Y. S. Kachanov  and
A. P. Roschektaev
V. I. Borodulin
Affiliation:
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Institutskaya str. 4/1, Novosibirsk 630090, Russia
A. V. Ivanov
Affiliation:
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Institutskaya str. 4/1, Novosibirsk 630090, Russia
Y. S. Kachanov*
Affiliation:
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Institutskaya str. 4/1, Novosibirsk 630090, Russia
A. P. Roschektaev
Affiliation:
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Institutskaya str. 4/1, Novosibirsk 630090, Russia
*
†Email address for correspondence: kachanov@itam.nsc.ru
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Abstract

This paper is devoted to an experimental investigation of receptivity of a laminar swept-wing boundary layer due to scattering of free-stream vortices on localized (in the streamwise direction) surface vibrations. The experiments were conducted under completely controlled disturbance conditions by means of a hot-wire anemometer on a model of a swept wing with a sweep angle of 25°. Both the free-stream vortices and the surface vibrations were generated by disturbance sources; their frequency–wavenumber spectra were measured thoroughly. The free-stream vorticity vectors were directed perpendicular to the incident-flow velocity vector and parallel to the swept-wing-model surface. The linearity of the receptivity mechanism under investigation (in a sense that the corresponding receptivity coefficients are independent of the disturbances amplitudes) has been checked carefully. The main goal of this experiment was to estimate the vibration-vortex receptivity coefficients as functions of the disturbance frequency, spanwise wavenumber and vortex offset parameter. This goal has been attained. Being defined in Fourier space, the obtained receptivity coefficients are independent of the specific surface vibration shape and can be used for verification of various receptivity theories.

JFM classification

Boundary Layers: Boundary layer receptivity Boundary Layers: Boundary layer stability Turbulent Flows: Turbulent transition

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Papers
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Journal of Fluid Mechanics , Volume 793 , 25 April 2016 , pp. 162 - 208
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© 2016 Cambridge University Press 

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