23rd Congress of International Council of the Aeronautical Sciences, 8-13 September, 2002, Toronto, Canada
Paper ICAS 2002-R17

DESIGN OF SURFACE ROUGHNESS FOR PASSIVE FLOW CONTROL

J. M. Floryan (1), S. K. Nikumb (2)
(1) University of Western Ontario, Canada; (2) National Research Council of Canada, Canada

Keywords: passive flow control, surface roughness, laser surface sculpturing

Procedures for the design and manufacturing of surface roughness for passive flow control are considered. The design strategy relies on the identification of hydrodynamically active surface roughness patterns using hydrodynamic stability theory. Patterns that give rise to streamwise vortices are of particular interest. It is demonstrated that it is possible to generate such vortices using roughness with a proper combination of the amplitude and wavelength. Techniques for manufacturing of the desired roughness using laser-based surface sculpturing are investigated. Preliminary results show that it is possible to produce the desired shapes with the required accuracy. The sculpturing process needs significant acceleration in order to make it economical.

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