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research-article

Measurements of the effects of streamwise riblets on boundary layer turbulence

[+] Author and Article Information
Derek B. Ancrum

Department of Mechanical and Aerospace Engineering Carleton University Ottawa, Ontario, K1S 5B6 Canada
DerekAncrum@cmail.carleton.ca

Metin I. Yaras

Department of Mechanical and Aerospace Engineering Carleton University Ottawa, Ontario, K1S 5B6 Canada
Metin.Yaras@carleton.ca

1Corresponding author.

ASME doi:10.1115/1.4037044 History: Received September 09, 2016; Revised May 10, 2017

Abstract

This study presents experimental results on the effects of riblets on the coherent structures of turbulence within a turbulent spot developing under favourable pressure gradients. The riblet spacings of the study correspond to 0.5 and 1.5 times the natural spacing of the low-speed streak. The cross-sectional dimensions of the riblets were chosen to control the spatial distribution of wave packets consisting of streamwise-aligned hairpin vortices. Both riblet spacings demonstrated effective control on the spanwise positioning of the wave packets. The wider spaced riblets reduced spanwise mutual interaction between wave packets. The closer-spaced riblets promoted this interaction via spanwise-oriented vortical structures which produced stronger turbulent fluctuations.

Copyright (c) 2017 by ASME
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