Near-field Wingtip Vortex Characteristics of a Rectangular Wing in Ground Effect

2016 ◽  
Author(s):  
Qiulin Qu ◽  
Liewei Huang ◽  
Peiqing Liu ◽  
Ramesh K. Agarwal
Keyword(s):  
Near Field ◽  
Ground Effect ◽  
Wingtip Vortex ◽  
Wing In Ground Effect

Effect of Ground Boundary Condition on Near-Field Wingtip Vortex Flow and Lift-Induced Drag

2020 ◽  
Vol 143 (3) ◽  
Author(s):  
A. Lu ◽  
T. Lee
Keyword(s):  
Boundary Condition ◽  
Near Field ◽  
Ground Effect ◽  
Tip Vortex ◽  
Secondary Vortex ◽  
Significant Discrepancy ◽  
Vortex Strength ◽  
Induced Drag ◽  
Wingtip Vortex ◽  
Ground Distance

Abstract The ground proximity is known to induce an outboard movement and suppression of the wingtip vortices, leading to a reduced lift-induced drag. Depending on the ground boundary condition, a large scatter exists in the published lift-induced drag and vortex trajectory. In this experiment, the ground boundary condition-produced disparity in the vortex strength and induced drag were evaluated. No significant discrepancy appeared for a ground distance or clearance larger than 30% chord. As the stationary ground was further approached, there was the appearance of a corotating ground vortex (GV), originated from the downstream progression of a spanwise ground vortex filament, which added vorticity to the tip vortex, leading to a stronger tip vortex and a larger lift-induced drag compared to the moving ground. For the moving ground, the ground vortex was absent. In close ground proximity, the rollup of the high-pressure fluid flow escaped from the wing's tip always caused the formation of a counter-rotating secondary vortex, which dramatically weakened the tip vortex strength and produced a large induced-drag reduction. The moving ground effect, however, induced a stronger secondary vortex, leading to a smaller lift-induced drag and a larger outboard movement of the tip vortex as compared to the stationary ground effect.

Smart Control Systems for Next-Generation Autonomous Wing-In-Ground Effect Vehicles

2010 ◽  
Vol 43 (15) ◽  
pp. 112-117 ◽  
Author(s):  
Alexander Nebylov ◽  
Sukrit Sharan ◽  
Farid Arifuddin
Keyword(s):  
Control Systems ◽  
Ground Effect ◽  
Next Generation ◽  
Smart Control ◽  
Wing In Ground Effect

Was Archaeopteryx a wing-in-ground effect flier?

Ibis ◽  
2002 ◽  
Vol 144 (4) ◽  
pp. 686-688 ◽  
Author(s):  
Brian O'Farrell ◽  
John Davenport ◽  
Thomas Kelly
Keyword(s):  
Ground Effect ◽  
Wing In Ground Effect

Design Parametric Study of a Compound Wing-in-Ground Effect. II: Aerodynamics Coefficients

2016 ◽  
Vol 29 (1) ◽  
pp. 04015023 ◽  
Author(s):  
Saeed Jamei ◽  
Adi Maimun ◽  
Shuhaimi Mansor ◽  
Nor Azwadi ◽  
Agoes Priyanto
Keyword(s):  
Parametric Study ◽  
Ground Effect ◽  
Wing In Ground Effect
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