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The structure of a supersonic turbulent boundary layer subjected to concave surface curvature

Published online by Cambridge University Press:  26 April 2006

John F. Donovan
Affiliation:
McDonnell Douglas Aerospace, St Louis, MO 63166, USA
Eric F. Spina
Affiliation:
Syracuse University, Mechanical and Aerospace Engineering Department, Syracuse, NY, USA
Alexander J. Smits
Affiliation:
Princeton University Gas Dynamics Laboratory Princeton, NJ 08544, USA

Abstract

This paper reports an experimental investigation of the instantaneous structure of a supersonic turbulent boundary layer (M = 2.86, Reθ = 82000) over a short region of longitudinal concave surface curvature. The radius of curvature was 12 initial boundary-layer thicknesses and the turning angle was 16°. Severe distortion of the boundary layer occurred, as evidenced by an alteration of the mean velocity profiles and an increase in wall shear stress of 125%. The large-scale organized motions in the boundary layer were significantly altered as illustrated by changes in the character of the mass flux ‘fronts’ (large gradients in the fluctuating streamwise mass flux).

Type
Research Article
Copyright
© 1994 Cambridge University Press

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