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Transitional shockwave/boundary layer interaction experiments in the R2Ch blowdown wind tunnel.

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Title: Transitional shockwave/boundary layer interaction experiments in the R2Ch blowdown wind tunnel.
Authors: Lugrin, Mathieu1 (AUTHOR) mathieu.lugrin@onera.fr, Nicolas, François1 (AUTHOR), Severac, Nicolas1 (AUTHOR), Tobeli, Jean-Pierre1 (AUTHOR), Beneddine, Samir1 (AUTHOR), Garnier, Eric1 (AUTHOR), Esquieu, Sebastien2 (AUTHOR), Bur, Reynald1 (AUTHOR)
Source: Experiments in Fluids. Feb2022, Vol. 63 Issue 2, p1-19. 19p.
Subjects: Wind tunnels, Proper orthogonal decomposition, Shock waves, Mach number, Reynolds number
Abstract: Transitional shockwave/boundary layer interactions (SBLI) are studied experimentally. Experiments are conducted on a hollow-cylinder flare model in the R2Ch blowdown facility at a Mach number of 5 for three different Reynolds numbers in the transitional regime. Unsteady wall pressure measurements are conducted along with mean and unsteady heat flux measurements and high-speed Schlieren imaging. The images are then processed using Proper Orthogonal Decomposition (POD) and Spectral Proper Orthogonal Decomposition (SPOD) to extract relevant information. Two main phenomena are identified and documented: the oblique modes traveling in the shear layer above the recirculation region and the streaks appearing in the reattachment region. New results illustrating the multiple physical origins of the streaks, either linked with globally unstable modes and convectively unstable mechanisms, are discussed. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Transitional shockwave/boundary layer interactions (SBLI) are studied experimentally. Experiments are conducted on a hollow-cylinder flare model in the R2Ch blowdown facility at a Mach number of 5 for three different Reynolds numbers in the transitional regime. Unsteady wall pressure measurements are conducted along with mean and unsteady heat flux measurements and high-speed Schlieren imaging. The images are then processed using Proper Orthogonal Decomposition (POD) and Spectral Proper Orthogonal Decomposition (SPOD) to extract relevant information. Two main phenomena are identified and documented: the oblique modes traveling in the shear layer above the recirculation region and the streaks appearing in the reattachment region. New results illustrating the multiple physical origins of the streaks, either linked with globally unstable modes and convectively unstable mechanisms, are discussed. [ABSTRACT FROM AUTHOR]
ISSN:07234864
DOI:10.1007/s00348-022-03395-9