Abstract
Accurate experimental characterization of longitudinal vortices induced by rectangular winglets is necessary to develop and validate numerical models that can predict these flows. For this aim, an experimental investigation is conducted to examine the characteristics of longitudinal vortices generated downstream rectangular winglets in fully developed turbulent channel flow. A row of rectangular winglet pairs is implemented in a parallel plate flow. Stereoscopic Particle Image Velocimetry (SPIV) is used to harvest three-dimensional (3D) instantaneous velocity fields for a Re = 4400 based on the channel’s hydraulic diameter and mean flow velocity. 3D velocity components, velocity streamlines, topologies of Γ2 function and normalized turbulent kinetic energy downstream the winglets are analyzed. It is shown that the flow properties are disturbed, and a main vortex pair is generated in addition to induced vortices downstream the rectangular winglets. Moreover, this work provides an SPIV benchmark of the complex flow developing downstream rectangular winglet pairs, where this configuration has been widley studied using numerical simulations.
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Abbreviations
- H :
-
Channel height, m
- X :
-
Longitudinal distance from VG trailing edge, m
- Y :
-
Transverse distance from channel mid-axis, m
- Z :
-
Vertical distance from channel bottom wall, m
- Re :
-
Reynolds number, dimensionless
- S :
-
Domain
- M :
-
Domain center
- U :
-
Mean flow velocity, m s−1
- u rms :
-
Rms velocity component, m s−1
- u :
-
Flow longitudinal velocity component, m s−1
- v :
-
Flow transverse velocity component, m s−1
- w :
-
Flow vertical velocity component, m s−1
- \( \overline{u},\overline{v},\overline{w} \) :
-
mean velocity components, m s−1
- u ′ , v ′ , w′ :
-
Turbulent Fluctuations, m s−1
- \( \overrightarrow{u_s} \) :
-
Velocity convection, m s−1
- \( \overrightarrow{u_m} \) :
-
Local velocity in a domain, m s−1
- y + :
-
Dimensionless wall distance
- U + :
-
Dimensionless mean velocity profile with wall shear velocity
- Γ1 :
-
Gamma-1 function
- Γ2 :
-
Gamma-2 function
- 2D-PIV:
-
2-Dimensional Particle Image Velocimetry
- 3D-PIV:
-
3-Dimensional Particle Image Velocimetry
- 3C-PIV:
-
3 Components Particle Image Velocimetry
- CCD:
-
Charge-coupled device
- CCW:
-
Counterclockwise
- CFD:
-
Computational Fluid Dynamics
- CW:
-
Clockwise
- DWP:
-
Delta Winglet Pair
- KEtot :
-
Total turbulent kinetic energy, J
- KEm :
-
Mean kinetic energy, J
- LDA:
-
Laser Doppler Anemometry
- LVG:
-
Longitudinal Vortex Generator
- Nd:YAG:
-
Neodymium-doped Yttrium Aluminum Garnet
- PIV:
-
Particle Image Velocimetry
- rms :
-
Root mean square
- RWP:
-
Rectangular Winglet Pair
- SPIV:
-
Stereoscopic Particle Image Velocimetry
- TKE:
-
Turbulent kinetic energy
- TVG:
-
Transverse Vortex Generator
- VG:
-
Vortex Generator
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Acknowledgements
This work was partially funded by the ANR CarnotMINES “C.I.E.T.”. Authors would like to acknowledge Chrystèle Qaegeber-Evrard for her contribution in the experimental work.
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Oneissi, M., Bouhoubeiny, E., Russeil, S. et al. Experimental analysis by stereo-PIV of the development of streamwise vortices downstream of rectangular winglets. Heat Mass Transfer 56, 2487–2502 (2020). https://doi.org/10.1007/s00231-020-02874-1
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DOI: https://doi.org/10.1007/s00231-020-02874-1