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Article Dans Une Revue Physics of Fluids Année : 2024

An in-depth examination of flow structures organization downstream of a delta-winglet pair vortex generator under laminar, transitional, and turbulent flow regimes

Eliane Younes
Souria Hamidouche
Rémi Gautier
Serge Russeil

Résumé

In the present study, we experimentally investigate the time-averaged and time-evolving flow structures generated downstream of a delta-winglet pair vortex generator in an airflow channel. The Stereoscopic Particle Image Velocimetry technique is used to measure the velocity fields in the cross-sectional planes at various axial positions along the channel. The analysis of time-averaged flow topology shows that the flow is predominantly composed of two main counter-rotating longitudinal vortices under laminar, transitional, and turbulent regimes. While the time-averaged flow behavior might appear simple, the real-time organization of the instantaneous flow structures presents more complex features. The study of the flow's temporal evolution indicates that the transition from laminar to turbulent regime is controlled by a meandering mechanism referred to the motion of the main vortex centers around their axis and the emergence of secondary structures that evolve periodically over time.

Dates et versions

hal-04487421 , version 1 (03-03-2024)

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Citer

Eliane Younes, Souria Hamidouche, Rémi Gautier, Serge Russeil. An in-depth examination of flow structures organization downstream of a delta-winglet pair vortex generator under laminar, transitional, and turbulent flow regimes. Physics of Fluids, 2024, 36 (2), pp.024117. ⟨10.1063/5.0185595⟩. ⟨hal-04487421⟩
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