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Friday, May 15, 2020 | History

3 edition of Vortex wake alleviation studies with a variable twist wing found in the catalog.

Vortex wake alleviation studies with a variable twist wing

G. Thomas Holbrook

Vortex wake alleviation studies with a variable twist wing

by G. Thomas Holbrook

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  • 1 Currently reading

Published by National Aeronautics and Space Administration, Scientific and Technical Information Branch, For sale by the National Technical Information Service] in [Washington, D.C.], [Springfield, Va .
Written in English

    Subjects:
  • Vortex-motion.

  • Edition Notes

    StatementG. Thomas Holbrook, Dana Morris Dunham, and George C. Greene.
    SeriesNASA technical paper -- 2442.
    ContributionsDunham, Dana Morris., Greene, George C., United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14664178M

    On wake vortex alleviation. Research within NASA relating to the nature of lift-induced vortex wakes behind large aircraft and the means whereby the hazard they represent to smaller aircraft can be alleviated is reviewed. carried out in ground based facilities and in flight shows that more rapid dispersion of the wake can be effected Author: L. Roberts. Figure 1 – Wake vortex studies/projects in the framework of European partnership [33]. The present paper aims at illustrating main results in the field of wake vortex alleviation, recorded from dedicated testing by: 4.

    A Stereoscopic PIV Study of a Near-field Wingtip Vortex Hirofumi Igarashi, Paul A. Durbin, Hongwei Ma and Hui Hu Department of Aerospace Engineering, Iowa State University, Ames, Iowa, Email: [email protected] Abstract An experimental study was conducted to investigate the wing-tip vortex generated from a. the wing. Every free vortex filament takes part of the movement that is induced by the other vortex filaments in that location. According to this vortex law the free vortex filaments with the same direction of rotation are twisted together in their common center at some distance behind the wing. So, the average distance d from the wing root of File Size: KB.

    Abstract. Multiple-vortex systems of aircraft wakes have been investigated experimentally in a unique large-scale laboratory facility, the free-flight B20 catapult bench, ONERA Lille. 2D/2C PIV measurements have been performed in a translating reference frame, which provided time-resolved crossvelocity observations of the vortex systems in a Lagrangian frame normal to the wake by: 5. the incoming flow; see figure 1. A vortex generator acts like a small wing with a low aspect ratio, and the flow past the tip creates a longitudinal vortex that convects high momentum fluid down into the boundary layer. The positive effect of vortex generators on an airplane wing is to delay separation.


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Vortex wake alleviation studies with a variable twist wing by G. Thomas Holbrook Download PDF EPUB FB2

Vortex wake alleviation studies with a variable twist wing. [Washington, D.C.]: National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va.: For sale by the National Technical Information Service], BASIC RESEARCH IN WAKE VORTEX ALLEVIATION USING A VARIABLE TWIST WING By Dana J.

Morris and G. Thomas Holbrook NASA Langley Research Center INTRODUCTION Aircraft trailing vortices are one of the principal factors affecting air- craft acceptance and departure rates at airports. Vortex wake alleviation studies were conducted in a wind tunnel and a water towing tank using a multisegmented wing model which provided controlled and measured variations in span load.

also be useful for active wake alleviation. We conducted an experimental and computational study toassess thepotential forusing MiTEs for active wake vortex alleviation. Wind tunnel tests were performed on a half-span model NACA wing equipped with an array of 13 independent MiTE pairs.

The chord-based Reynolds number was aroundInvestigation of vortex wakes behind various aircraft, especially behind wide bodied and heavy cargo ones, is of both scientific and practical in terest. The vortex wakes shed from the wing’s trailing edge are long lived and attenuate only atdistances of10–12kmbehindthe wake generating : Hardcover.

The wake is the stream of turbulent air behind a plane, and everything on the plane in contact with the outside air contributes to it. This video shows. Numerical Study of the Effect of Spoiler Configuration on Wake Vortex Alleviation Journal of Aerospace Engineering, Vol.

28, No. 3 Fluidic Control of a Wing Tip VortexCited by:   In the study, the vortex and wake characteristics were computed for three classic wing designs: the elliptic wing, and wing designs developed in classic studies by.

The wake-generating aircraft in the second series of tests were a C-5A and a DC, with a DC and a Learjet used to probe the C-5A's wake and an L and a DC-9 probing the DC wake. The flights revealed that the strength of the vortices produced by the largest and heaviest of the tri-jets, the DC, was comparable to.

Schell, I., Özger, E., Jacob, D., “Influence of Different Flap Settings on the Wake-Vortex Structure of a Rectangular Wing with Flaps and Means of Alleviation with Wing Fins”, Aerospace Science and Technology, No.

4 (), pp. 79–90, Google ScholarCited by: 3. field is interpreted as wing twist (or as local angle of attack). To find out how well the vortex-lattice method represents the interaction of a wing with the vortical flowfields of lift-generated wakes, a potential flow analysis based on Munk's crossflow theory _ was carried out for the interaction of a potential vortex filament with a wing of File Size: KB.

ζ Wake (vortex) age, rad θtw Effective linear blade twist per radius, degrees λh Non-dim. hover induced velocity, CT 2 λi Induced velocity, scaled by vh µW Effective wake transport velocity, scaled by vh µx Non-dimensional forward speed,V∞ v h µz Non-dimensional climbing speed,Vc vh ρ Air density, kgm 3 σ Rotor solidity, Nb c πR ψ File Size: 1MB.

situations exists. In any case the wake vortex produces an adverse effect on aircraft motion which is the reason for the today’s encounter avoidance policy.

The pilots position concern-ing wake vortex is formulated by the statement that no aircraft should encounter a wake vortex by. Wake Vortex Alleviation by Differe ntial Flap Setting and Oscillating Flap Setting: A flight test Guido Voss 1, Thomas Gerz 2, Robert Baumann 2, Eike Stumpf 3, Michael Press 4.

Investigation of vortex wakes behind various aircraft, especially behind wide bodied and heavy cargo ones, is of both scientific and practical in terest. The vortex wakes shed from the wing’s trailing edge are long lived and attenuate only atdistances of10–12kmbehindthe wake generating aircraft.

Technische Universität München Wing elements Dipl.-Ing. Jung, PD Dr.-Ing. Breitsamter FAR-Wake Workshop, 2 Problem task – wake vortex alleviation Analysis of turbulent flow fields and unsteady effects.

A Novel Vortex Method to Investigate Wind Turbine Near-Wake Characteristics Pavithra Premaratne1, and Hui Hu2() Iowa State University, Ames, Iowa,USA.

We utilize vortex methods to identify possible mechanisms which cause vortex filaments to break-up in the wake behind a. It was a fixed-wing drone and it already had wing tips. By analyzing and improving them, we improved the lift over drag ratio by up to 30%. Which is quite massive for a fixed-wing drone.

Vortex is book three of the Spin series. If you haven't read Spin and like sci-fi at all, you should definitely read it. Incredibly great book, with some truly beautiful ideas.

The second book in the series wasn't that great, but Vortex makes up for it. Not quite as good as Spin, it still manages to stand on it's own/5. Wake vortex is essentially caused by the span wise flow of air along the wing, due to the high and low pressure areas. If you take the infinite aerofoil, theoretically there would be no span wise flow and therefore no induced drag and wake vortex.

), but you don't need to read the previous series to read Vortex Visions. It will give you context for a lot things but this book stands on its it wasn't an instant catch, this book had me hooked by the end and I am SO very excited to explore the world beyond the Empire in future books (because I'm pretty sure that's where we're headed!)/5().The team's studies suggest that non-elliptical wings could increase the distance required for a wake vortex to form by up to 12 times.

Ryoh Ishihara Researchers from the University of Illinois Urbana-Champaign have examined new shapes of aircraft wing and determined that non-elliptical wings could reduce the significance of the wingtip vortices.In the study, the vortex and wake characteristics were computed for three classic wing designs: the elliptic wing, and wing designs developed in classic studies by R.T.

Jones and Ludwig Prandt. “The elliptic wing configuration has been used as the gold standard of aerodynamic efficiency for the better part of a century.