Abstract
An experimental investigation has been undertaken to study the behaviour of a single circular synthetic jet issued into turbulent boundary layer produced on a flat plate in cross flow. At the given free-stream conditions, the jet is also issued into laminar boundary layer so that an effective evaluation on the interaction of the vortices with the changing boundary layer could be made. The flow visualization technique is used in conjunction with the stereoscopic imaging system to reveal a unique quasi three-dimensional recognition of the vortices formed in either type of boundary layer under varying synthetic jet actuator (SJA) operating conditions. Firstly, the laminar boundary layer is produced on the flat plate with zero pressure gradient and later on the same boundary layer is triggered to turbulence using a trigger device. The free-stream conditions are justified by PIV measurements, in that the velocity profiles are drawn at given streamwise locations for both laminar and turbulent boundary layers. The parametric map is given to identify and bound the SJA operating parameters to produce the explicit vortical structures at the given conditions.
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Abbreviations
- D c :
-
Cavity diameter, mm
- L :
-
Dimensionless stroke length
- U :
-
Characteristic velocity, m/s
- y :
-
Normal distance from wall, mm
- δ :
-
Boundary layer thickness, mm
- ρ :
-
Fluid density, kg/m3
- Re L :
-
Reynolds number based on dimensionless stroke length
- f :
-
Diaphragm oscillation frequency, Hz
- St. :
-
Strouhal number
- x :
-
Streamwise distance, mm
- z :
-
Spanwise distance from centerline, mm
- c f :
-
Skin friction coefficient
- ∆:
-
Diaphragm peak-to-peak displacement, mm
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Acknowledgments
The first author would like to thank University of Engineering and Technology Lahore, Pakistan to fund for his PhD studies and the moral support. Thanks to Dr. Zhang, S. for his valuable assistance to build the rig for the experimental work.
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Chaudhry, I.A., Zhong, S. A single circular synthetic jet issued into turbulent boundary layer. J Vis 17, 101–111 (2014). https://doi.org/10.1007/s12650-014-0199-0
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DOI: https://doi.org/10.1007/s12650-014-0199-0