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2005•Proceeding of Fourth International Symposium on Turbulence and Shear Flow PhenomenaRequires access

TURBULENT BOUNDARY LAYER SEPARATION - PASSIVE CONTROL

Ola Lögdberg, P. Henrik Alfredsson

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Abstract

We report results where a separated turbulent boundary layer is controlled using vortex generators of various heights. Measurements are performed using Particle Image Velocimetry (PIV) and velocity profiles, reversed flow profiles and integral parameters of the boundary layer are presented. The effectiveness of the separation control is shown to depend on the circulation induced by the vortex generators and for the largest values a complete cancellation of the separation seems to be possible.

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What this paper is about

We report results where a separated turbulent boundary layer is controlled using vortex generators of various heights. Measurements are performed using Particle Image Velocimetry (PIV) and velocity profiles, reversed flow profiles and integral parameters of the boundary layer are presented. The effectiveness of the separation control is shown to depend on the circulation induced by the vortex generators and for the largest values a complete cancellation of the separation seems to be possible.

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Available abstract

We report results where a separated turbulent boundary layer is controlled using vortex generators of various heights. Measurements are performed using Particle Image Velocimetry (PIV) and velocity profiles, reversed flow profiles and integral parameters of the boundary layer are presented. The effectiveness of the separation control is shown to depend on the circulation induced by the vortex generators and for the largest values a complete cancellation of the separation seems to be possible.

Key concepts: Boundary layer, Particle image velocimetry, Flow separation, Separation (statistics), Vortex generator, Vortex, Boundary layer control, Mechanics

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