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Investigation of the effects of a compliant surface on boundary-layer stability

Published online by Cambridge University Press:  26 April 2006

T. Lee ,
M. Fisher  and
W. H. Schwarz
T. Lee
Affiliation:
Johns Hopkins University, Baltimore, MD 21218, USA
M. Fisher
Affiliation:
Johns Hopkins University, Baltimore, MD 21218, USA
W. H. Schwarz
Affiliation:
Johns Hopkins University, Baltimore, MD 21218, USA
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Abstract

Some of the effects of a passive, single-layer, viscoelastic compliant surface on the stability of a Blasius boundary layer were investigated in a low-turbulence wind tunnel. Measurements of the wavelength and growth rates of vibrating-ribbon-excited harmonic waves were made by hot-wire anemometry. The data for three compliant surfaces with different shear moduli, material damping coefficients, and thicknesses were compared to rigid-surface data. The flow-induced surface displacements were measured using an electro-optic displacement transducer. The results show that the growth rates of unstable Tollmien–Schlichting waves, and the extent of the unstable region in the (F, Rδ*)-plane are reduced over the compliant surfaces relative to those over a rigid surface with the absence of flow-induced surface instabilities. The suppression of the Tollmien–Schlichting waves is accompanied by a surface motion driven by the flow field at the excitation frequency. The experimental results suggest that a delay of the onset to turbulence is possible in air by using appropriately tuned surface characteristics. Further experiments are needed to study the three-dimensional disturbance mode, the flow-induced surface instabilities and the breakdown process.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 288 , 10 April 1995 , pp. 37 - 58
Copyright
© 1995 Cambridge University Press

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