Spatial resolution effects on PIV measurements in a turbulent wake flow

1994 ◽  
Author(s):  
K. Paschal ◽  
C. Yao ◽  
S. Ullrich
Keyword(s):  
Spatial Resolution ◽  
Turbulent Wake ◽  
Wake Flow ◽  
Piv Measurements

scholarly journals An industrial light field camera applied for 3D velocity measurements in flow past confined cylinder

2019 ◽  
Vol 196 ◽  
pp. 00056
Author(s):  
Alexander Seredkin ◽  
Maxim Shestakov ◽  
Tokarev Mikhail
Keyword(s):  
Quality Control ◽  
Spatial Resolution ◽  
Light Field ◽  
Optical Axis ◽  
Turbulent Wake ◽  
Velocity Fields ◽  
Depth Of Field ◽  
Velocity Measurements ◽  
Piv Measurements ◽  
Light Field Image

Light field cameras have some advantages over classic cameras in a narrow field of application, such photography, cinematography surveillance and quality control in industry. Light field cameras have larger depth of field, compare to regular camera, but lower spatial resolution along optical axis then binocular system. However, 3D velocity measurements using light field are reasonable alternative to modern 3D PIV measurements. The nature of light field image requires extra reconstruction step which affects overall accuracy. In this article, light field PTV was compared to Tomo-PIV. Both techniques were used to measure 3D velocity fields in a turbulent wake past confined cylinder.

Control of the turbulent wake flow behind a circular cylinder by asymmetric sectoral hydrophobic coatings

2021 ◽  
Vol 33 (12) ◽  
pp. 121703
Author(s):  
Anatoliy Lebedev ◽  
Konstantin Dobroselsky ◽  
Alexey Safonov ◽  
Sergey Starinskiy ◽  
Veronica Sulyaeva ◽  
...  
Keyword(s):  
Circular Cylinder ◽  
Turbulent Wake ◽  
Wake Flow ◽  
Hydrophobic Coatings

Two-Dimensional Experimental Investigation on the Effects of a Fowler Flap Gap and Overlap Size on the Wake Flow Field

2016 ◽  
Vol 139 (2) ◽  
Author(s):  
David Demel ◽  
Mohsen Ferchichi ◽  
William D. E. Allan ◽  
Marouen Dghim
Keyword(s):  
Experimental Investigation ◽  
Flow Field ◽  
Angle Of Attack ◽  
Wake Flow ◽  
Two Dimensional ◽  
Edge Region ◽  
Suction Surface ◽  
Trailing Edge ◽  
Piv Measurements ◽  
Image Velocimetry

This work details an experimental investigation on the effects of the variation of flap gap and overlap sizes on the flow field in the wake of a wing-section equipped with a trailing edge Fowler flap. The airfoil was based on the NACA 0014-1.10 40/1.051 profile, and the flap was deployed with 40 deg deflection angle. Two-dimensional (2D) particle image velocimetry (PIV) measurements of the flow field in the vicinity of the main wing trailing edge and the flap region were performed for the optimal flap gap and overlap, as well as for flap gap and overlap increases of 2% and 4% chord beyond optimal, at angles of attack of 0 deg, 10 deg, and 12 deg. For all the configurations investigated, the flow over the flap was found to be fully stalled. At zero angle of attack, increasing the flap gap size was found to have minor effects on the flow field but increased flap overlap resulted in misalignment between the main wing boundary layer (BL) flow and the slot flow that forced the flow in the trailing edge region of the main wing to separate. When the angle of attack was increased to near stall conditions (at angle of attack of 12 deg), increasing the flap gap was found to energize and improve the flow in the trailing edge region of the main wing, whereas increased flap overlap further promoted flow separation on the main wing suction surface possibly steering the wing into stall.

Mass Transport in Shallow Turbulent Wake Flow by Planar Concentration Analysis Technique

2009 ◽  
Vol 135 (4) ◽  
pp. 257-270 ◽  
Author(s):  
Carl F. Carmer ◽  
Andreas C. Rummel ◽  
Gerhard H. Jirka
Keyword(s):  
Mass Transport ◽  
Turbulent Wake ◽  
Wake Flow ◽  
Analysis Technique
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