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EPTT 2024
14th Spring School on Transition and Turbulence
BOUNDARY LAYER TRANSITION AFFECTED BY A GAP
Submission Author:
Victor Barcelos Victorino , SP
Co-Authors:
Victor Barcelos Victorino, Felipe Oliveira Aguirre, Lenz Jossue Lopez Lazaro, Marcello Augusto Faraco de Medeiros
Presenter: Marcello Augusto Faraco de Medeiros
doi://10.26678/ABCM.EPTT2024.EPT24-0026
Abstract
The present paper experimentally investigates how a gap affects the boundary layer stability and transition. The experiments were carried out in a low turbulence intensity wind tunnel and the experimental rig consisted of a cavity with interchangeable depth inserted on a flat plate. We employed hot wire anemometry for measuring velocity and a Preston tube to determine the transition location. Results showed that a shallow gap does not significantly affect the transition. Strong destabilization of the T-S waves was observed from a gap deeper than a certain threshold, including traces of non-linear growth. As the gap depth continued to increase, the destabilization of T-S waves and the shift in transition location tended to remain saturated by this non-linear regime. Ultimately, the Rossiter mode emergence was identified, and when it reached large amplitudes, promoted an abrupt transition at the gap trailing edge.
Keywords
Gap, cavity, Tollmien-Schlichting waves, transition, Rossiter mode
