[article]
| Titre : |
An experimental study of the laminar flow separation on a low-Reynolds-number airfoil |
| Type de document : |
texte imprimé |
| Auteurs : |
Hui, Hu, Auteur ; Zifeng Yang, Auteur |
| Année de publication : |
2009 |
| Article en page(s) : |
11 p. |
| Note générale : |
Fluids engineering |
| Langues : |
Anglais (eng) |
| Mots-clés : |
Separation (technology) airfoils bubbles pressure boundary layers laminar flow flow (dynamics) drag (fluid dynamics) |
| Résumé : |
An experimental study was conducted to characterize the transient behavior of laminar flow separation on a NASA low-speed GA (W)-1 airfoil at the chord Reynolds number of 70,000. In addition to measuring the surface pressure distribution around the airfoil, a high-resolution particle image velocimetry (PIV) system was used to make detailed flow field measurements to quantify the evolution of unsteady flow structures around the airfoil at various angles of attack (AOAs). The surface pressure and PIV measurements clearly revealed that the laminar boundary layer would separate from the airfoil surface, as the adverse pressure gradient over the airfoil upper surface became severe at AOA≥8.0deg. The separated laminar boundary layer was found to rapidly transit to turbulence by generating unsteady Kelvin–Helmholtz vortex structures. After turbulence transition, the separated boundary layer was found to reattach to the airfoil surface as a turbulent boundary layer when the adverse pressure gradient was adequate at AOA12.0deg. |
| En ligne : |
http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] |
in Transactions of the ASME . Journal of fluids engineering > Vol. 130 N° 5 (Mai 2008) . - 11 p.
[article] An experimental study of the laminar flow separation on a low-Reynolds-number airfoil [texte imprimé] / Hui, Hu, Auteur ; Zifeng Yang, Auteur . - 2009 . - 11 p. Fluids engineering Langues : Anglais ( eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 130 N° 5 (Mai 2008) . - 11 p.
| Mots-clés : |
Separation (technology) airfoils bubbles pressure boundary layers laminar flow flow (dynamics) drag (fluid dynamics) |
| Résumé : |
An experimental study was conducted to characterize the transient behavior of laminar flow separation on a NASA low-speed GA (W)-1 airfoil at the chord Reynolds number of 70,000. In addition to measuring the surface pressure distribution around the airfoil, a high-resolution particle image velocimetry (PIV) system was used to make detailed flow field measurements to quantify the evolution of unsteady flow structures around the airfoil at various angles of attack (AOAs). The surface pressure and PIV measurements clearly revealed that the laminar boundary layer would separate from the airfoil surface, as the adverse pressure gradient over the airfoil upper surface became severe at AOA≥8.0deg. The separated laminar boundary layer was found to rapidly transit to turbulence by generating unsteady Kelvin–Helmholtz vortex structures. After turbulence transition, the separated boundary layer was found to reattach to the airfoil surface as a turbulent boundary layer when the adverse pressure gradient was adequate at AOA12.0deg. |
| En ligne : |
http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] |
|
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