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Roughness-induced turbulent wedges in a hypersonic blunt-body boundary layer

Published online by Cambridge University Press:  30 July 2014

A. Fiala
Affiliation:
Department of Aeronautics, Imperial College London, South Kensington, London SW7 2AZ, UK
R. Hillier*
Affiliation:
Department of Aeronautics, Imperial College London, South Kensington, London SW7 2AZ, UK
D. Estruch-Samper
Affiliation:
Department of Aeronautics, Imperial College London, South Kensington, London SW7 2AZ, UK Department of Mechanical Engineering, National University of Singapore, 117575, Singapore
*
Email address for correspondence: [email protected]

Abstract

This paper uses measurements of surface heat transfer to study roughness-induced turbulent wedges in a hypersonic boundary layer on a blunt cylinder. A family of wedges was produced by changing the height of an isolated roughness element, providing conditions in the following range: fully effective tripping, for the largest element, with a turbulent wedge forming immediately downstream of the element; a long wake, in length several hundred times the boundary layer thickness, leading ultimately to transition; and retention of laminar flow, for the smallest element. With appropriate element size, a fully intermittent wedge formed, comprising a clear train of turbulent spots.

Type
Papers
Copyright
© 2014 Cambridge University Press 

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