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Friday, May 22, 2020 | History

2 edition of Aircraft trailing vortices found in the catalog.

Aircraft trailing vortices

Zakaria M. El-Ramly

Aircraft trailing vortices

a survey of the problem

by Zakaria M. El-Ramly

  • 51 Want to read
  • 28 Currently reading

Published by Carleton University, Faculty of Engineering in Ottawa .
Written in English

    Subjects:
  • Vortex-motion.

  • Edition Notes

    Statementby Z. El-Ramly.
    SeriesReport (Carleton University. Faculty of Engineering. Division of Aerothermodynamics)
    ContributionsCarleton University. Division of Aerothermodynamics., Carleton University. Dept. of Mechanical and Aeronautical Engineering.
    The Physical Object
    Paginationvii, 186 leaves.
    Number of Pages186
    ID Numbers
    Open LibraryOL19959258M

    A MODEL FOR SIMULATION OF FLIGHT PASSAGES THROUGH TRAILING TIP VORTICES 2 General Background All aircraft (‘A/C’) will react some way or the other on interacting vortical flow encountered in vortex wakes. The dynamic response will depend on the generating A/C, the incoming A/C itself and the speed and flight. Wake vortices can cause crashes All aircraft produce wake vortices much like two small horizontal tornadoes trailing behind the wing tips. The larger and heavier the plane the stronger the wake. That means small aircraft that follow larger ones can encounter turbulence if they are not kept far enough apart.

    Helicopters will generate a pair of wingtip vortices when in forward flight. - These vortices are strong, high-speed trailing vortices that are similar to wing tip vortices produced by larger fixed-wing aircraft - Some evidence indicates that per pound of gross mass, helicopter vortices are more intense than those of a fixed-wing aircraft.   Volpe’s Aircraft Wakes and Weather Division designs and conducts measure­ments of wake behavior and atmospheric conditions at major airports. We develop and test new wake, weather, and visibility sensors, and operate the nationally recognized Otis Weather Test Facility to support these activities.

    A uniform lift distribution over the wing of an aircraft would cause the shedding of two wingtip trailing vortices and a (stationary) starting vortex. Note that in reality, lift distribution cannot be uniform, and that viscosity causes decay of the trailed and starting : Olivier Cleynen. Aircraft Wake Turbulence and Its Detection Sub-Scale Modeling of Aircraft Trailing Vortices. Pages Aircraft Wake Turbulence and Its Detection Book Subtitle Proceedings of a Symposium on Aircraft Wake Turbulence held in Seattle, Washington, September 1–3, Sponsored jointly by the Flight Sciences Laboratory, Boeing.


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Aircraft trailing vortices by Zakaria M. El-Ramly Download PDF EPUB FB2

VISCOUS EFFECTS IN AIRCRAFT TRAILING VORTICES" Alan J. Bilanin, Milton E. Teske, Coleman duP. Donaldson and Richard S. Snedeker Aeronautical Research Associates of Princeton, Inc.

SUMMARY The mechanism of merging like-signed aircraft vortices leads to a rapid redistribution of trailed vorticity in a wake through both convective and turbulent Size: 5MB. Trailing vortices of large aircraft present a wake hazard for following aircraft. Two main approaches were taken to attenuate the rolling moment Author: Philippe Spalart.

23 1. Introduction 24 a. Motivation 25 Aircraft trailing vortices are a hazard to following airplanes during take-off and landing (e.g., 26 Barbagallo ). For a review of their dynamics, see Spalart ().

Due to their mutually 27 induced velocity, a pair of trailing vortices generally descends from the altitude where it was 28 generated. (For exceptions to this in strongly stratified.

The production of lift results in the generation of vortices trailing an aircraft. The airplane wing applies pressure to the band of air through which it sweeps.

The natural tendency of the Aircraft trailing vortices book to escape sideways creates an overturning motion on each Aircraft trailing vortices book of the aircraft, and therefore the wake consists primarily of a pair of large, powerful Author: Philippe R. Spalart. These phenomena are due to non-linearity.

A premature break-up of aircraft trailing vortices could be obtained by promoting this kind of instabilities (see Crouch and Jacquin, ).

Download: Download full-size image; Fig. Development of the Crow instability in a contrail at two different instants. Download: Download full-size imageCited by: This review surveys the formation, motion, and persistence of trailing vortices as relevant to the safety and productivity of air travel.

It highlights findings or shifts made since review in this series. This review also examines the predictability of the vortices (particularly in terms of lifespan), the durability of multiple vortex pairs, the controversy between expectations of vortex decay Cited by: INVISCID MODELING OF AIRCRAFT TRAILING VORTICES Vernon J.

Rossow Ames Research Center SUMMARY A survey is presented of inviscid theoretical methods that have proven useful in the study of lift-generated vortices. inviscid theories are then presented which have helped to guide research directed at alleviating the velocities and rolling moments File Size: KB.

Trailing vortices are naturally shed by airplanes and they typically evolve into a counter-rotating vortex pair. Downstream of the aircraft, these vortices can persist for a very long time and extend for several by: 1.

American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA A realistic lift distribution over the wing of an aircraft. The continuously-changing lift distribution causes the shedding of a vortex sheet whose strength varies span-wise.

The generation of negative lift at the tail and the reduction of lift around the fuselage cause the shedding of vortices rotating in the direction opposite to that of the.

Aircraft trailing vortices constitute both a kaleidoscope of instructive fluid dynamics phenomena and a challenge for the sustained development of Cited by: 1.

Influence of Downwash on the Tailplane. On most aircraft the tailplane is between the trailing vortices springing from the wing ahead, and the flow around it is considerably influenced by them. Forces on airfoils are proportional to the square of the velocity and the angle of attack.

around the engine nacelles. Notice the condensation on the A trailing as a sheet behind the wing. The two illustrations below show similar phenomena on modern jet fighters, the F and F/AE.

Both aircraft are trailing tip vortices, which File Size: KB. Aircraft Response to Turbulence Including Wakes.- Airloads and Moments on an Aircraft Flying Over a Pair of Inclined Trailing Vortices.- Aircraft Wake Turbulence Controllability Experiment.- Fog Formation and Dispersal by Trailing Vortices.- An Estimate of the Power Required to Eliminate Trailing Vortices by Suction.- Panel Discussion.

ATV - Aircraft Trailing Vortices. Looking for abbreviations of ATV. It is Aircraft Trailing Vortices. Aircraft Trailing Vortices listed as ATV. Aircraft Trailing Vortices; Aircraft trails; Aircraft trails; Aircraft Transfer Order; aircraft transient servicing; Aircraft Transport Kit.

Bound and Trailing Vortices of Supersonic Flow, and the in Downwash of a Delta Wing By the Linearised Theory in the Wake i 2 "'"!~" ' ii A.

ROBINSON,S., and Squadron Leader J. HUNTER-Ton, M.A., of both bound and trailing vortices for supersonic as w~ll as for low-speed flight. This leads to a convenient method,File Size: KB.

: Abstract Aircraft trailing vortices constitute both a kaleidoscope of instructive fluid dynamics phenomena and a challenge for the sustained development of the safety and capacity of the air-transportation system. This section gives an overview of the wake vortex issue commencing at its historical roots, proceeding with a.

Aircraft trailing vortices/Tourbillons de sillages d’avions Physics of vortex merging Patrice Meunier∗, Stéphane Le Dizès, Thomas Leweke Institut de recherche sur les phénomènes hors équilibre, CNRS/universités Aix-Marseille I & II, 49, rue Frédéric Joliot Curie, BPMarseille ce France Available online 27 July book-end vortices.

Mesoscale vortices observed at the ends of a line segment of convective cells, usually cyclonic on the northern end of the system and anticyclonic on the southern end, for an environment of westerly vertical wind shear (in the Northern Hemisphere).

trailing vortices, and their effect on aircraft which fly into them. Theory indicates that the strength of trailing vortices increase directly as tne weight and inversely as the span and speed of the aircraft.

It may be expected, therefore, that the problem will assume serious propor. The theory presented in [1] is extended to the two-dimensional case and predictions of the shape of aircraft trails are displayed in nondimensional form.

As a special case we present a preliminary prediction for the wake shape of ain cruise condition, for a set of parameters that are only approximately by: 3. But vortices are present in more places than reported in this advisory circular.

AC G reports that, “An aircraft generates vortices from the moment it rotates on takeoff to touchdown, since trailing vortices are a by-product of wing lift.” Not exactly.

Vortices begin early in the takeoff roll and can continue after touchdown. Every aircraft in flight generates a wake.

Historically, when pilots encountered this wake the disturbance was attributed to “prop wash.” It is known, however, that this disturbance is caused by a pair of counter-rotating vortices trailing from the wing-tips.

The vortices from large aircraft pose problems to encountering :