Eventos Anais de eventos
EPTT 2024
14th Spring School on Transition and Turbulence
Some experimental results of the impact caused by a rectangular bump on boundary layer transition.
Submission Author:
Lenz Jossue Lopez Lazaro , SP , Brazil
Co-Authors:
Lenz Jossue Lopez Lazaro, Victor Barcelos Victorino, Marcello Augusto Faraco de Medeiros
Presenter: Lenz Jossue Lopez Lazaro
doi://10.26678/ABCM.EPTT2024.EPT24-0023
Abstract
The study of surface irregularities is an important topic in the aeronautical field. Various approaches have been reviewed over time, integrating semi-empirical theories to anticipate and explain the behavior of the boundary layer under these conditions. In this paper will be seen some experimental results of the effects caused by rectangular bump on the transition from laminar to turbulence of the boundary layer, where this single roughness is placed at a certain distance from the leading edge of a flat plate with a little pressure gradient. The experiments were carried out at the Low Acoustic Noise and Turbulence (LANT) wind tunnel from the School of Engineering of São Carlos, University of São Paulo. This documentation shows how the amplification of Tollmien-Schlichting waves is significantly affected by different bump heights and free stream velocities. Furthermore, it will be shown that for determined bump heights, an abrupt transition of the boundary layer is reveled.
Keywords
Boundary Layer Transition, Tollmien–Schlichting wave, bypass transition, Bump
