Helicopter Rotor Ground Effect and Frigate Interaction Investigated by Particle Image Velocimetry

AIAA Journal ◽  
2021 ◽  
pp. 1-15
Author(s):  
Rafael Bardera Mora ◽  
Juan Carlos Matías García
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Ground Effect ◽  
Helicopter Rotor ◽  
Image Velocimetry

Discrepancy in the Aerodynamic Property and Flowfield of a Symmetric Airfoil Produced by the Stationary and Moving Ground Effect

2020 ◽  
Vol 143 (2) ◽  
Author(s):  
V. Tremblay-Dionne ◽  
T. Lee
Keyword(s):  
Boundary Layer ◽  
Particle Image Velocimetry ◽  
Particle Image ◽  
Ground Surface ◽  
Leading Edge ◽  
Ground Effect ◽  
Edge Region ◽  
Flow Passage ◽  
Image Velocimetry ◽  
Aerodynamic Property

Abstract The discrepancy in the aerodynamic property and flowfield of a symmetric airfoil produced by the stationary and moving ground effect was quantified through surface pressure and particle-image-velocimetry measurements. The results show that the stationary ground effect produced a higher lift than the moving ground due to the flow passage restriction caused by the longitudinal boundary layer developed on its ground surface. In close ground proximity, the formation of a ground vortex beneath the airfoil's leading-edge region speeded up the flow, leading to a lower lift than its moving-ground counterpart. For the moving ground, the ground vortex was absent. In close ground proximity, the moving ground effect generated a larger wake and drag than the stationary ground effect.

Multiwavelets and Particle Image Velocimetry methods

1999 ◽  
Author(s):  
Andrew Kurdila ◽  
Othon Rediniotis ◽  
Thomas Strganac ◽  
Jeonghwan Ko
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Image Velocimetry
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