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Study of a Crossflow over a Zero-Net-Mass-Flux Synthetic Jet Driven by a Vibrating Diaphragm

Published online by Cambridge University Press:  07 December 2011

L.-Y. Tseng ,
A.-S. Yang  and
J.-C. Lin
L.-Y. Tseng
Affiliation:
Institute of Mechatronic Engineering, National Taipei University of Technology, Taipei, Taiwan 10608, R.O.C.
A.-S. Yang*
Affiliation:
Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, Taipei, Taiwan 10608, R.O.C.
J.-C. Lin
Affiliation:
Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, Taipei, Taiwan 10608, R.O.C.
*
**Professor, corresponding author
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Abstract

Miniature synthetic jet actuators are low operating power, zero-net-mass-flux and very compact devices which have demonstrated their capability in modifying the subsonic flow characteristics for boundary layer flow control. In order to improve the design active flow control systems, the present study aims to examine the formation and interaction of unsteady flowfield of a synthetic jet with external crossflow. In view of a single synthetic jet emitting into a turbulent boundary layer crossflow via a circular orifice, the theoretical model utilized the transient three-dimensional conservation equations of mass and momentum for compressible, turbulent flows with a negligible temperature variation over the computational domain. The motion of a movable membrane plate was also treated as the moving boundary by prescribing the displacement on the plate surface. The predictions by the computational fluid dynamics (CFD) software ACE+® were compared with the measured transient phase-averaged velocities in literature for code validation. The predictions showed the time evolution of the large vortical structure originating from the jet orifice and its successive interaction with the crossflow to change the flow structure inside the boundary layer.

Keywords

Synthetic jetBoundary layer separationVortex structureActive flow control
Type
Articles
Information
Journal of Mechanics , Volume 27 , Issue 4 , December 2011 , pp. 503 - 509
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2011

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References

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