The near-wake of discrete roughness elements on swept wings

Tomographic PTV measurements

Conference paper (2022)

Authors

G. Zoppini Aerodynamics - Aerospace Engineering
Theodorus Michelis Aerodynamics - Aerospace Engineering
D. Ragni Wind Energy - Aerospace Engineering
M. Kotsonis Aerodynamics - Aerospace Engineering
Research Group
Aerodynamics (Aerospace Engineering) (TU Delft)
Copyright: © 2022 G. Zoppini, Theodorus Michelis, D. Ragni, M. Kotsonis
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Published Date

2022

Language

English

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Faculty

Aerospace Engineering

Department

Flow Physics and Technology

Research Group

Aerodynamics

Abstract

This work presents the first reported experimental characterization of the flow field in the direct vicinity of discrete roughness elements (DRE), in a swept wing boundary layer. High magnification tomographic Particle Tracking Velocimetry (3D-PTV) measurements are used to acquire time-averaged velocity and standard deviation fields in a 3D volume directly aft of the DRE elements. The collected data detail the near-element flow topology, providing information on the developing wake and emerging flow structures, their organization and amplitude evolution. A transient growth behaviour is identified in the element wake, while onset and growth of crossflow instabilities is observed further downstream. As such, the near element flow is confirmed to be a fundamental part of the receptivity process, contributing in setting the initial amplitudes for the crossflow instability evolution.

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- Embargo expired in 01-06-2023