dorsal/arxiv
View SchemaD\'eveloppement d'instabilit\'es dans un \'ecoulement subsonique se d\'eveloppant au-dessus d'une cavit\'e : mesures synchronis\'ees PIV-LDV
| Authors | Thierry Faure, François Lusseyran, Luc Pastur, Romain Pethieu, Philippe Debesse |
|---|---|
| Categories | |
| ArXiv ID | physics/0609008 |
| URL | https://arxiv.org/abs/physics/0609008 |
| Journal | Congr\`{e}s Francophone de Techniques Laser, CFTL 2006, Toulouse, 19 - 22 septembre 2006, France (2006) |
Abstract
A boundary layer interacting with a cavity is a benchmark case that is present in environmental applications, aeronautics, automobile aerodynamics or industrial applications, where the velocity over a rectangular cavity is relatively low. In the present investigation, the interaction between a laminar boundary layer with external velocity Ue and an open cavity is investigated experimentally for medium range Reynolds numbers (between 4600 and 18500) with flow diagnostics optical methods, for a cavity aspect ratio (length over depth) of two. A shear layer induces a main vortex and a counter-rotating secondary vortex inside the cavity. The shear layer also develops instabilities interacting with the downstream cavity edge. Particle image velocimetry (PIV) and laser Doppler velocimetry (LDV) measurements are synchronized in order to get global information of both spatial velocity fields and time-resolved signals in a particular position situated downstream of the development of the shear layer above the cavity. The PIV velocity fields are phase-averaged with a singular value decomposition of the LDV signal.
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"abstract": "A boundary layer interacting with a cavity is a benchmark case that is\npresent in environmental applications, aeronautics, automobile aerodynamics or\nindustrial applications, where the velocity over a rectangular cavity is\nrelatively low. In the present investigation, the interaction between a laminar\nboundary layer with external velocity Ue and an open cavity is investigated\nexperimentally for medium range Reynolds numbers (between 4600 and 18500) with\nflow diagnostics optical methods, for a cavity aspect ratio (length over depth)\nof two. A shear layer induces a main vortex and a counter-rotating secondary\nvortex inside the cavity. The shear layer also develops instabilities\ninteracting with the downstream cavity edge. Particle image velocimetry (PIV)\nand laser Doppler velocimetry (LDV) measurements are synchronized in order to\nget global information of both spatial velocity fields and time-resolved\nsignals in a particular position situated downstream of the development of the\nshear layer above the cavity. The PIV velocity fields are phase-averaged with a\nsingular value decomposition of the LDV signal.",
"arxiv_id": "physics/0609008",
"authors": [
"Thierry Faure",
"Fran\u00e7ois Lusseyran",
"Luc Pastur",
"Romain Pethieu",
"Philippe Debesse"
],
"categories": [
"physics.class-ph"
],
"journal_ref": "Congr\\`{e}s Francophone de Techniques Laser, CFTL 2006, Toulouse,\n 19 - 22 septembre 2006, France (2006)",
"title": "D\\\u0027eveloppement d\u0027instabilit\\\u0027es dans un \\\u0027ecoulement subsonique se d\\\u0027eveloppant au-dessus d\u0027une cavit\\\u0027e : mesures synchronis\\\u0027ees PIV-LDV",
"url": "https://arxiv.org/abs/physics/0609008"
},
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