Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Experiments on the influence of bump on the boundary layer transition.
Submission Author:
Lenz Jossue Lopez Lazaro , SP , Brazil
Co-Authors:
Lenz Jossue Lopez Lazaro, Victor Barcelos Victorino, Felipe Oliveira Aguirre, Marcello Augusto Faraco de Medeiros
Presenter: Lenz Jossue Lopez Lazaro
doi://10.26678/ABCM.COBEM2023.COB2023-2177
Abstract
Real aircraft often exhibit surface irregularities, such as bumps, which can lead to a decrease in performance due to the anticipated transition of the boundary layer. Thus, this paper presents an experimental investigation of the effects of a two-dimensional bump on boundary layer transition dominated by Tollmien-Schlichting (T-S) waves. The objective of this research is to understand the influence of a 2D bump on the dynamics of T-S growth and the transition from laminar to turbulent flow. 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. Hot-wire anemometry was employed to measure mean and fluctuation velocity. Concerning the detection of the transition location, a Preston tube was applied. The experimental rig consists of an aluminum flat plate with a chord of 2.32 m featuring a bump in x=0.6 m with adjustable height, with a maximum stroke of 20 mm. The results of this study are expected to provide insights into the effects of surface irregularities on aircraft performance and could lead to improved design strategies for future aircraft.
Keywords
Boundary Layer Transition, Tollmien-Schlichting (T-S) waves, Bump
