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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.5

ISSN Imprimir: 1065-3090
ISSN On-line: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v9.i2-3.50
18 pages

EXPERIMENTAL CHARACTERIZATION OF THE FLOW WITHIN A TRANSITIONAL RECTANGULAR CAVITY

Philippe Reulet
ONERA - The French Aerospace Lab, 31055, Toulouse Cedex 4, France
Marie-Josephe Esteve
Airbus, Aerodynamic Department, 316 Route de Bayonne, B.P. M0131/1, 31060 Toulouse Cedex 3, France
Pierre Millan
Onera – Centre de Toulouse Département Modèles pour l'Aérodynamique et l'Energétique 2, Avenue Edouard Belin B.P 4025 31055 Toulouse cedex 4 – France
Michel L. Riethmuller
von Karman Institute for Fluid Dynamics, 72 Chaussee de Waterloo, B-1640 Rhode Saint Genese, Belgique

RESUMO

A rectangular cavity with a length-to-depth ratio of 10 is characterized by means of two optical velocimetry systems: Laser Doppler Velocimetry (LDV) and Particles Images Velocimetry (PIV). Each of these two measurement systems provides a complementary contribution to the understanding of this complex flow. A detailed mean velocity field is acquired by LDV, it shows the presence of a thin fluid layer near the bottom wall where the flow goes upstream all along the cavity which is qualified to be "transitional" and includes a stagnation point within the flow. PIV measurements enable the detection of coherent structures in the flow and the analysis of their evolution near the stagnation point where they interact with the bottom wall. Three different zones are specially studied by a spectral analysis of the LDV velocity signals to define the main detachment frequency of coherent structures.


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