The effect of upstream boundary layer conditions on planar wake development

K. Kilany, L. Chen, J. Soria

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Abstract

This paper investigates the characteristics of the turbulent wake structure developing from the trailing edge of an elliptical leading edge flat plate using particle image velocimetry. The objective of this present research is to measure the velocity fields in the near and far wake regions of the flat plate to provide insight into the flow mechanisms responsible for the development of the coherent structures within the wake due to the characteristics of the boundary layer at the trailing edge. The effect of two different boundary layers at the trailing edge of the flat plate is investigated - one laminar and one turbulent. In the laminar boundary layer case, the boundary layer is allowed to develop from the elliptic leading edge without disturbance to the trailing edge feeding a laminar boundary layer into the wake. In the turbulent boundary layer case, exactly the same free-stream velocity as the laminar case is used, but the boundary layer is tripped at the leading edge such that a turbulent boundary layer at the trailing edge feeds into the wake. All experiments were conducted in a 500 mm recirculating horizontal water tunnel at LTRAC at a Reynolds number, based on the plate thickness, h, of 2700. The velocity fields in the near wake and far wake were measured using multigrid crosscorrelation digital particle image velocimetry (MCCDPIV). Prior to the experiments, the tunnel was seeded with 11 μm diameter hollow glass spheres. A two cavity pulsed Nd: YAG laser was used to illuminate the seed particles in the plane of interest. The planar illumination sheet was formed with suitable spherical and cylindrical lenses. Single exposed images of 4008 × 2672 pixels were recorded during the experiments.

Original languageEnglish
Title of host publicationProceedings of the 16th Australasian Fluid Mechanics Conference, 16AFMC
Pages712-719
Number of pages8
Publication statusPublished - 1 Dec 2007
EventAustralasian Fluid Mechanics Conference 2007 - Crown Plaza, Gold Coast, Australia
Duration: 3 Dec 20077 Dec 2007
Conference number: 16th

Conference

ConferenceAustralasian Fluid Mechanics Conference 2007
Abbreviated title16AFMC
CountryAustralia
CityGold Coast
Period3/12/077/12/07

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