Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/921386

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Title
Near-field measurements and development of a new boundary layer over a flat plate with localized suction
Author/Creator
Agrawal, Amit;  Djenidi, Lyazid;  Antonia, R. A.
Institution
The University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering
Description
Suction on a turbulent boundary layer is applied through a narrow strip in order to understand the effects suction can have on the boundary layer development and turbulent structures in the flow. Detailed two-component laser Doppler velocimetry (LDV) and laser-induced fluorescence (LIF) based measurements have been undertaken in regions close to the suction strip and further downstream. The region close to the strip involves a flow reversal accompanied by a change in sign for the Reynolds shear stress and strong gradients in the flow variables. The mean streamwise velocity after suction remains larger than its corresponding no-suction value. Relative to the no-suction case, the velocity fluctuations first decrease with suction followed by a slow recovery which may involve a slight overshoot. LIF visualizations indicate that compared to the no-suction case, the low-speeds streaks stay closer to the wall and exhibit a smaller amount of spanwise and wallnormal oscillations with suction. The visualization results are consistent with two-point velocity correlation measurements. The streamwise and spanwise correlation measurements indicate that the structures are disrupted or removed from the boundary layer due to suction suggesting that the original boundary layer has been strongly influenced by suction. The results are explained by the development of a new inner layer that forms downstream of the suction strip.
Relation
Experiments in Fluids Vol. 48, Issue 5, p. 747-762
Publisher Link
http://dx.doi.org/10.1007/s00348-009-0766-7
Date
2010
Publisher
Springer
Keyword(s)
laser Doppler velocimetry;  laser-induced fluorescence;  turbulent boundary layer;  near-field;  suction
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/921386
Identifier
ISSN:0723-4864
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Subject
"Experiments in Fluids"
 
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