Flow-Field Measurement of Embedded Streamwise Vortex Generated from Passive Flow-Control Devices

Detailed flow-field measurements were performed downstream of a single vortex generator (VG) using a Stereo Digital Particle Image Velocimetry system. The passive flow-control devices examined consisted of a low-profile VG with a device height, h, approximately equal to 20 percent of the boundary-la...

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Bibliographic Details
Published in:International Journal of Flow Control 2009-12, Vol.1 (4), p.255-270
Main Authors: Yao, Chung-Sheng, Lin, John, Allan, Brian
Format: Article
Language:English
Subjects:
Circulation
Devices
Digital particle image velocimetry
Fluid dynamics
Fluid flow
Trajectories
Vortices
Vorticity
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Summary:Detailed flow-field measurements were performed downstream of a single vortex generator (VG) using a Stereo Digital Particle Image Velocimetry system. The passive flow-control devices examined consisted of a low-profile VG with a device height, h, approximately equal to 20 percent of the boundary-layer thickness, Delta , and a conventional VG with h approximately Delta . Flow-field data were taken at twelve cross-flow planes downstream of the VG to document and quantify the evolution of embedded streamwise vortex. Key parameters including vorticity, circulation, trajectory, and half-life radius-describing concentration, strength, path, and size, respectively-of the device-induced streamwise vortex were extracted from the flow-field data. Peak vorticity and circulation for the low-profile VG decayed exponentially to the distance downstream from the device. The device-height normalized vortex trajectories for the low-profile VG, especially in the lateral direction, followed the general trends of the conventional VG.
ISSN:1756-8250
DOI:10.1260/1756-8250.1.4.255