Effects of Pressure Gradients on Turbulent Boundary Layer Flow Over a Flat Plate with Riblets - Couverture souple

Dement, Franklin L

Couverture souple

ISBN 10 : 1249830990 ISBN 13 : 9781249830993

Editeur : Biblioscholar, 2012

Synopsis

The Air Force Institute of Technology Boundary Layer Research Facility test section was modified to create controlled non-zero streamwise pressure gradients. The capability of the modified facility to reproduce theoretical laminar boundary layer velocity profiles and to create a self-preserving flow with an adverse streamwise pressure gradient was verified with three-dimensional laser Doppler anemometry. The effects of streamwise adverse and favorable pressure gradients on turbulent boundary layer flow characteristics (velocity profiles, turbulence and skin friction) and vortex formation over a flat plate with riblets at low speed (U = 5 m/s) were studied. Normal and spanwise velocity profiles for both pressure gradients showed the presence of paired counter-rotating vortices nested within the riblet valleys. These flow structures increased drag and significantly altered near-wall flow compared to a smooth plate turbulent boundary layer. The adverse pressure gradient tended to degrade these vortices as the flow progressed.

Détails de l'édition

• Éditeur: Biblioscholar
• Date d'édition: 2012
• Langue: anglais
• ISBN 10: 1249830990
• ISBN 13: 9781249830993
• Reliure: Broché
• Nombre de pages: 140
• Coordonnées du fabricant: non disponible
• Personne responsable: non disponible