Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/5606
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dc.contributor.authorJabbal, M-
dc.contributor.authorZhong, S-
dc.date.accessioned2011-07-18T15:00:12Z-
dc.date.available2011-07-18T15:00:12Z-
dc.date.issued2010-
dc.identifier.citationPhysics of Fluids 22(6): 063603, Jun 2010en_US
dc.identifier.issn1070-6631-
dc.identifier.urihttp://bura.brunel.ac.uk/handle/2438/5606-
dc.descriptionCopyright @ 2010 American Institute of Physicsen_US
dc.description.abstractAn experimental investigation of the interaction between a synthetic jet actuator and a zero-pressure gradient laminar boundary layer is reported. The aim of this study is to quantify the impact of synthetic jet vortical structures; namely, hairpin vortices, stretched vortex rings and tilted vortex rings on a boundary layer, and to assess their relative potential for flow separation control. Streamwise particle image velocimetry was employed in a water flume (free stream boundary layer thickness Reynolds number of 500 and boundary layer thickness-to-jet orifice diameter ratio of 4) to obtain phase- and time-averaged boundary layer profile information of the impact of synthetic jets near the wall. The potential for flow control was assessed by analyzing near wall fluid mixing, realized by the measure of increase in wall shear stress produced by a passing vortex. Hairpin vortices (produced at a jet-to-free stream velocity ratio, VR=0.32 and dimensionless stroke length, L=1.6) and stretched vortex rings (VR=0.27; L=2.7) exhibit characteristics akin to a streamwise vortex pair with a common upwash. Conversely, tilted vortex rings (VR=0.54; L=2.7) induce a streamwise vortex pair in the near wall region with a common downwash. Wall shear stress measurements show that synthetic jets composed of stretched vortex rings offer the best combination of near wall fluid mixing, persistency, and low rms fluctuations for potential applications of flow separation control.en_US
dc.description.sponsorshipFinancial support from the Engineering and Physical Sciences Research Council (EPSRC Grant No. AF566NEZ) was used for this work.en_US
dc.languageEN-
dc.language.isoenen_US
dc.publisherAmerican Institute of Physicsen_US
dc.subjectCross-flowen_US
dc.subjectSimulationen_US
dc.subjectActuatorsen_US
dc.subjectEvolutionen_US
dc.titleParticle image velocimetry measurements of the interaction of synthetic jets with a zero-pressure gradient laminar boundary layeren_US
dc.typeArticleen_US
dc.identifier.doihttp://dx.doi.org/10.1063/1.3432133-
pubs.organisational-data/Brunel-
pubs.organisational-data/Brunel/Brunel (Active)-
pubs.organisational-data/Brunel/Brunel (Active)/School of Engineering & Design-
pubs.organisational-data/Brunel/School of Engineering & Design-
Appears in Collections:Publications
Mechanical and Aerospace Engineering
Dept of Mechanical and Aerospace Engineering Research Papers

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