Evaluation of Fast-Time Wake Vortex Prediction Models

Proctor, Fred H.; Hamilton, David W.

doi:10.2514/6.2009-344

Cited by 46 publications

(40 citation statements)

References 21 publications

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“…3,7,8 A concept by Rossow 9,10 proposes precision approaches that follow individual compact flight corridors. In this concept, a wake-zone fast-time model 11 is used to manage the wake vortex risk, 12 and the corridors are navigated with systems that utilize global positioning satellites (GPS). Rossow's concept also allows for new runways to be paved between existing ones, thus further improving capacity by adding new runways on existing airport property (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Interaction of Aircraft Wakes From Laterally Spaced Aircraft

Proctor¹

2009

47th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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Large Eddy Simulations are used to examine wake interactions from aircraft on closely spaced parallel paths. Two sets of experiments are conducted, with the first set examining wake interactions out of ground effect (OGE) and the second set for in ground effect (IGE). The initial wake field for each aircraft represents a rolled-up wake vortex pair generated by a B-747. Parametric sets include wake interactions from aircraft pairs with lateral separations of 400, 500, 600, and 750 ft. The simulation of a wake from a single aircraft is used as baseline. The study shows that wake vortices from either a pair or a formation of B-747's that fly with very close lateral spacing, last longer than those from an isolated B-747. For OGE, the inner vortices between the pair of aircraft, ascend, link and quickly dissipate, leaving the outer vortices to decay and descend slowly. For the IGE scenario, the inner vortices ascend and last longer, while the outer vortices decay from ground interaction at a rate similar to that expected from an isolated aircraft. Both OGE and IGE scenarios produce longer-lasting wakes for aircraft with separations less than 600 ft. The results are significant because concepts to increase airport capacity have been proposed that assume either aircraft formations and/or aircraft pairs landing on very closely spaced runways.

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Section: Introductionmentioning

confidence: 99%

“…11,19 Also it has been used to characterize the onset of Crow 20 instability. 21,22 Simulations with TASS agree with Sarpkaya 23 and Crow and Bate's 24 analytical predictions that show the time of vortex linking is dependent upon atmospheric turbulence via the nondimensional eddy dissipation rate (Fig.…”

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confidence: 99%

Interaction of Aircraft Wakes From Laterally Spaced Aircraft

Proctor¹

2009

47th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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“…13 Understanding of how crosswind shear affects wake vortex transport and decay is needed in order to improve the accuracy of the fast-time models. Most fast-time models ignore effects from the gradient of crosswind shear and assume both members of a vortex pair descend and decay at the same rate.…”

Section: Introductionmentioning

confidence: 99%

Crosswind Shear Gradient Affect on Wake Vortices

Proctor

Ahmad

2011

3rd AIAA Atmospheric Space Environments Conference

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“…They are the Deterministic 2-Phased (D2P) model 6 and the TASS Driven Algorithm for Wake Prediction (TDAWP). 8,9 Both D2P and TDAWP account for two-phased vortex decay. Other studies rooted in laboratory experiments, field data, and theory, have assumed a single-phased decay function for their predictions.…”

Section: Introductionmentioning

confidence: 99%

Three-Phased Wake Vortex Decay

Proctor

Ahmad

Switzer

et al. 2010

AIAA Atmospheric and Space Environments Conference

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A detailed parametric study is conducted that examines vortex decay within turbulent and stratified atmospheres. The study uses a large eddy simulation model to simulate the out-of-ground effect behavior of wake vortices due to their interaction with atmospheric turbulence and thermal stratification. This paper presents results from a parametric investigation and suggests improvements for existing fast-time wake prediction models. This paper also describes a three-phased decay for wake vortices. The third phase is characterized by a relatively slow rate of circulation decay, and is associated with the ringvortex stage that occurs following vortex linking. The three-phased decay is most prevalent for wakes imbedded within environments having low-turbulence and near-neutral stratification. Nomenclature

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Evaluation of Fast-Time Wake Vortex Prediction Models

Cited by 46 publications

References 21 publications

Interaction of Aircraft Wakes From Laterally Spaced Aircraft

Interaction of Aircraft Wakes From Laterally Spaced Aircraft

Crosswind Shear Gradient Affect on Wake Vortices

Three-Phased Wake Vortex Decay

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