Dynamic Wind Tunnel Simulation of Aircraft Wake Vortex Trajectory in Ground Proximity

Environmental crosswind can greatly affect the development of aircraft wake vortex pair. Previous numerical simulations and experiments have shown that the nonlinear vertical shear of the crosswind velocity can affect the dissipation rate of the aircraft wake vortex, causing each vortex of the vortex pair descent with different velocity magnitude, which will lead to the asymmetrical settlement and tilt of the wake vortex pair. Through numerical simulations, this article finds that uniform crosswind convection and linear vertical shear crosswind convection can also have an effect on the strength of the vortex. This effect is inversely proportional to the cube of the vortex spacing, so it is more intense on small separation vortex pair. In addition, the superposition of crosswind and vortex-induced velocities will lead to the asymmetrical pressure distribution around the vortex pair, which will also cause the tilt of the vortex pair. Furthermore, a new analysis method for wake vortex is proposed, which can be used to predict the vortex trajectory.

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Analysis of Predicted Aircraft Wake Vortex Transport and Comparison with Experiment

Journal of Aircraft ◽

10.2514/3.59843 ◽

1975 ◽

Vol 12 (7) ◽

pp. 619-620

Author(s):

M. R. Brashears ◽

James N. Hallock

Keyword(s):

Wake Vortex ◽

Comparison With Experiment ◽

Aircraft Wake

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Modeling the Radar Signature of Raindrops in Aircraft Wake Vortices

Journal of Atmospheric and Oceanic Technology ◽

10.1175/jtech-d-11-00220.1 ◽

2013 ◽

Vol 30 (3) ◽

pp. 470-484 ◽

Cited By ~ 7

Author(s):

Zhongxun Liu ◽

Nicolas Jeannin ◽

Francois Vincent ◽

Xuesong Wang

Keyword(s):

Traffic Control ◽

Vortex Flow ◽

Doppler Radar ◽

Elevation Angle ◽

Wake Vortex ◽

Wake Vortices ◽

Radar Signature ◽

Radar Echo ◽

Aircraft Wake ◽

Resolution Cell

Abstract The present work is dedicated to the modeling and simulation of the radar signature of raindrops within wake vortices. This is achieved through the computation of the equation of raindrop motion within the wake vortex flow. Based on the inhomogeneous distribution of raindrops within wake vortices, the radar echo model is computed for raindrops in a given resolution cell. Simulated Doppler radar signatures of raindrops within wake vortices are shown to be a potential criterion for identifying wake vortex hazards in air traffic control. The dependence of the radar signature on various parameters, including the radial resolution and antenna elevation angle, is also analyzed.

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Wind-tunnel simulation of store jettison with the aid of an artificial gravity generated by magnetic fields.

Journal of Aircraft ◽

10.2514/3.43793 ◽

1967 ◽

Vol 4 (1) ◽

pp. 48-51 ◽

Cited By ~ 6

Author(s):

EUGENE E. COVERT

Keyword(s):

Wind Tunnel ◽

Magnetic Fields ◽

Artificial Gravity ◽

Wind Tunnel Simulation

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Wind tunnel simulation of the Texas tech building

Journal of Wind Engineering and Industrial Aerodynamics ◽

10.1016/0167-6105(92)90571-q ◽

1992 ◽

Vol 43 (1-3) ◽

pp. 1617-1618

Author(s):

D. Surry

Keyword(s):

Wind Tunnel ◽

Wind Tunnel Simulation

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A new atmospheric boundary layer wind tunnel simulation methodology for wind effects on large cooling towers considering wind environment variations

Advances in Structural Engineering ◽

10.1177/1369433218809899 ◽

2018 ◽

Vol 22 (5) ◽

pp. 1194-1210 ◽

Cited By ~ 2

Author(s):

XX Cheng ◽

X Chen ◽

YJ Ge ◽

H Jiang ◽

L Zhao

Keyword(s):

Boundary Layer ◽

Wind Tunnel ◽

Atmospheric Boundary Layer ◽

Model Test ◽

Test Results ◽

Wind Effects ◽

Simulation Methodology ◽

Codes Of Practice ◽

Wind Tunnel Simulation ◽

Tunnel Model

The traditional atmospheric boundary layer wind tunnel model test practice employs wind fields, the flow characteristics of which are in accordance with the empirical formulae of the atmospheric turbulence presented in Codes of Practice and monographs. However, the empirical formulae presented in Codes of Practice and monographs cannot truthfully reflect the high variations of the realistic atmospheric turbulence which sometimes aggravates wind effects on structures. Based on model tests conducted in a multiple-fan actively controlled wind tunnel, it is found that most wind effects on large cooling towers change monotonically with the increase in free-stream turbulence, and the model test results are more unfavorable for a flow field of low turbulence intensity than for a flow field of high turbulence intensity with respect to the measured coherences. Thus, a new atmospheric boundary layer wind tunnel simulation methodology for wind effects on circular cylindrical structures is proposed to overcome the deficiency of the traditional atmospheric boundary layer wind tunnel model tests. The new simulation methodology includes the simulation of two realistic atmospheric boundary layer flow fields with the highest and the lowest turbulence intensities in the wind tunnel and the envelopment of model test results obtained in the two flow fields (e.g. the mean and fluctuating wind pressure distributions, the power spectral density, the coherence function, and the correlation coefficient). The superiority of the new atmospheric boundary layer wind tunnel simulation methodology over the traditional model test practice is demonstrated by comparing the model test results with the full-scale measurement data.

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