Effectiveness of micro synthetic jet actuator enhanced by flow instability on controlling laminar separation caused by adverse pressure gradient

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dc.contributor.author Hong, Guang en_US
dc.date.accessioned 2009-12-21T02:32:15Z
dc.date.available 2009-12-21T02:32:15Z
dc.date.issued 2006 en_US
dc.identifier 2006005002 en_US
dc.identifier.citation Hong Guang 2006, 'Effectiveness of micro synthetic jet actuator enhanced by flow instability on controlling laminar separation caused by adverse pressure gradient', Elsevier, vol. 132, no. 2, pp. 607-615. en_US
dc.identifier.issn 0924-4247 en_US
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/4208
dc.description.abstract This paper aims to understand how a micro synthetic jet actuator works effectively to prevent the boundary layer flow from laminar separation caused by adverse pressure gradient. Experimental results showed that syntheticjets were effective when the forcing frequency was a lower frequency of the Tollmien-Schlichting (T-S) wave, which received amplification from the base flow. They demonstrated the feasibility of controlling a largescale structure feature, such as flow separation, using a micro actuator which requires very low power supply 7.5 V) and generates inaudible noise in a boundary layer with the Reynolds number of 1.78 x 10(5)-2.24 x 10(5). The interaction between the synthetic jet and the base flow is analyzed, and the significance of using the instability to make the synthetic jets effective is discussed. To enable a micro actuator to work effectively on preventing the boundary layer flow from laminar separation, the key issue is to use the synthetic jet actuator as an instability trigger to trigger T-S instability which resonates with the Kelvin-Helmortz (K-H) instability to accelerate the viscous transition. The triggered T-S waves are amplified and enhanced by the non-viscous K-H instability of the base flow and consequently become effective in controlling the K-H instability. As a trigger rather than a force generator, the synthetic jet actuator actuates independently to its size and weight. en_US
dc.publisher Elsevier en_US
dc.relation.hasversion Accepted manuscript version en_US
dc.relation.isbasedon http://dx.doi.org/10.1016/j.sna.2006.02.040 en_US
dc.rights NOTICE: This is the author’s version of a work that was accepted for publication by Elsevier. Changes resulting from the publishing process,such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published by Elsevier. en_US
dc.title Effectiveness of micro synthetic jet actuator enhanced by flow instability on controlling laminar separation caused by adverse pressure gradient en_US
dc.parent Sensors and Actuators A: Physical en_US
dc.journal.volume 132 en_US
dc.journal.number 2 en_US
dc.publocation Kindlington, Oxford OX5 1GB, UK en_US
dc.identifier.startpage 607 en_US
dc.identifier.endpage 615 en_US
dc.cauo.name FEIT.School of Elec, Mech and Mechatronic Systems en_US
dc.conference Verified OK en_US
dc.for 091300 en_US
dc.personcode 900424 en_US
dc.percentage 34 en_US
dc.classification.name Mechanical Engineering en_US
dc.classification.type FOR-08 en_US
dc.description.keywords Synthetic jet actuator; Separation Flow Control, Laminar separation; T-S instability; K-H instability en_US
dc.staffid 900424 en_US


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