Experimental Characterization of the Laminar-Turbulent Transition of a Sucked Boundary Layer due to Surface Defects in a Two-Dimensional Incompressible Flow

Methel, Jeanne; Vermeersch, Olivier; Forte, Maxime; Casalis, Grégoire

doi:10.2514/6.2018-3214

Cited by 4 publications

(4 citation statements)

References 8 publications

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“…This is consistent with the experiments of Jeong [8] where no clear distortion of a boundary layer due to surface roughness was visible. Be that as it may, the results obtained here do not allow to conclude whether amplification is affected by roughness since very little distortion of the boundary layer can have dramatic effect on the amplification, as shown by Methel [12] who found nearly no effect of suction on the boundary layer profile whereas the influence on amplification was clearly demonstrated. More investigations, especially in the near-wall region where the influence of the surface roughness could be the most important, will be necessary to conclude.…”

Section: B Effect Of Roughness On Transition Locationcontrasting

confidence: 65%

“…As illustrated in the figures 1 and 2, a flat plate (1200 mm long, 600 mm large and 38 mm thick) made of aluminium with a specific recess for three exchangeable inserts, is mounted horizontally in the wind tunnel. This plate has a leading edge shape that was numerically optimized to minimize any suction peak on the upper side where measurements are acquired, as for the plate described in [12] which has the same shape. The lower side is semi-elliptical while the upper side is defined by a third-order Béziers polynomial.…”

Section: Experimental Setup a Experimental Facilitymentioning

confidence: 99%

“…Several solutions can be used to determine the transition location using the hot wire's signal. The chosen method [12] consists in determining the transition location thanks to the slope of the curve of u' U 0 against the abscissa. A data point is considered to be the beginning of the transition if the slope is higher than 2.10 −4 [mm −1 ] and stays positive for at least 100 mm.…”

Section: B Instrumentation and Data Acquisitionmentioning

confidence: 99%

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An experimental study of the effects of surface roughness on the laminar-turbulent transition of a 2D incompressible boundary-layer

Ducaffy¹,

Forte²,

Vermeersch³

et al. 2021

AIAA Scitech 2021 Forum

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Section: B Effect Of Roughness On Transition Locationcontrasting

confidence: 65%

Section: Experimental Setup a Experimental Facilitymentioning

confidence: 99%

Section: B Instrumentation and Data Acquisitionmentioning

confidence: 99%

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An experimental study of the effects of surface roughness on the laminar-turbulent transition of a 2D incompressible boundary-layer

Ducaffy¹,

Forte²,

Vermeersch³

et al. 2021

AIAA Scitech 2021 Forum

Self Cite

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“…As a result, the maximum freestream turbulence levels, evaluated over frequencies ranging from 3 Hz to 10 kHz, across all tested speeds were below 0.18%. More details on the evaluation of the turbulence levels can be found in Methel et al (2018).…”

Section: Experimental Facilitymentioning

confidence: 99%

Experimental investigation on the effect of forward-facing steps and gaps combined with wall suction on boundary layer transition

et al. 2021

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An experimental study on the effects of two-dimensional positive surface defects on the laminar–turbulent transition of a sucked boundary layer

et al. 2019

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To cite this version:Jeanne Methel, Maxime Forte, Olivier Vermeersch, Grégoire Casalis. An experimental study on the effects of two-dimensional positive surface defects on the laminar-turbulent transition of a sucked boundary layer. Abstract Laminar-turbulent transition can be e↵ectively delayed using Laminar Flow Control (LFC) by boundary layer suction. However, major obstacles to the industrial implementation of this technique are related to practical limitations such as proper integration of the suction system or unreliability of current design tools. The influence of surface discontinuities that can arise from installing an LFC system (and that can potentially cancel or deteriorate its stabilizing effect on the boundary layer) is scarcely documented in the open literature, adding to the complexity of improving numerical models. The present investigation therefore focuses on experimentally characterizing the e↵ects of surface defects on the laminar-turbulent tran-J. Methel Jeanne Methel et al. ural Tollmien-Schlichting instabilities. For these critical cases, the mechanisms of transition therefore seem mainly governed by the presence of the positive surface defects rather than by instabilities altered by wall suction.

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Experimental Characterization of the Laminar-Turbulent Transition of a Sucked Boundary Layer due to Surface Defects in a Two-Dimensional Incompressible Flow

Cited by 4 publications

References 8 publications

An experimental study of the effects of surface roughness on the laminar-turbulent transition of a 2D incompressible boundary-layer

An experimental study of the effects of surface roughness on the laminar-turbulent transition of a 2D incompressible boundary-layer

Experimental investigation on the effect of forward-facing steps and gaps combined with wall suction on boundary layer transition

An experimental study on the effects of two-dimensional positive surface defects on the laminar–turbulent transition of a sucked boundary layer

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