[article]
| Titre : |
Flow bistability downstream of three-dimensional double backward facing steps at zero-degree sideslip |
| Type de document : |
texte imprimé |
| Auteurs : |
Herry, Benjamin B., Auteur ; Keirsbulck, Laurent, Auteur ; Labraga, Larbi, Auteur |
| Année de publication : |
2011 |
| Article en page(s) : |
04 p. |
| Note générale : |
Fluids engineering |
| Langues : |
Anglais (eng) |
| Mots-clés : |
Flow control instability visualisation Turbulence Two-phase flow |
| Index. décimale : |
620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux |
| Résumé : |
The flow downstream of a three-dimensional double backward facing step (3D DBWFS) is investigated for Reynolds number Reh ranging from 5×103 to 8×104 (based on the first step height h). The flow is studied both qualitatively by means of laser tomoscopy and oil-flow visualizations and quantitatively by means of particle image velocimetry (PIV) measurements. In particular, the results show a mean flow asymmetry. A sensitivity study around zero degree sideslip has shown that the flow is bistable for this geometry. This bistability has been observed in two different wind tunnels for very different upstream conditions. As a main consequence, the zero degree drift angle could be a relevant validation case of unstable flow computation. More tests are carried out to understand and control this particular flow feature. |
| DEWEY : |
620.1 |
| ISSN : |
0742-4795 |
| En ligne : |
http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JFEGA400013 [...] |
in Transactions of the ASME . Journal of fluids engineering > Vol. 133 N° 5 (Mai 2011) . - 04 p.
[article] Flow bistability downstream of three-dimensional double backward facing steps at zero-degree sideslip [texte imprimé] / Herry, Benjamin B., Auteur ; Keirsbulck, Laurent, Auteur ; Labraga, Larbi, Auteur . - 2011 . - 04 p. Fluids engineering Langues : Anglais ( eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 133 N° 5 (Mai 2011) . - 04 p.
| Mots-clés : |
Flow control instability visualisation Turbulence Two-phase flow |
| Index. décimale : |
620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux |
| Résumé : |
The flow downstream of a three-dimensional double backward facing step (3D DBWFS) is investigated for Reynolds number Reh ranging from 5×103 to 8×104 (based on the first step height h). The flow is studied both qualitatively by means of laser tomoscopy and oil-flow visualizations and quantitatively by means of particle image velocimetry (PIV) measurements. In particular, the results show a mean flow asymmetry. A sensitivity study around zero degree sideslip has shown that the flow is bistable for this geometry. This bistability has been observed in two different wind tunnels for very different upstream conditions. As a main consequence, the zero degree drift angle could be a relevant validation case of unstable flow computation. More tests are carried out to understand and control this particular flow feature. |
| DEWEY : |
620.1 |
| ISSN : |
0742-4795 |
| En ligne : |
http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JFEGA400013 [...] |
|
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