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Saturday, August 1, 2020 | History

2 edition of Effects of winglets on the drag of a low-aspect-ratio configuration found in the catalog.

Effects of winglets on the drag of a low-aspect-ratio configuration

Leigh Ann Smith

Effects of winglets on the drag of a low-aspect-ratio configuration

by Leigh Ann Smith

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  • 15 Currently reading

Published by National Aeronautics and Space Administration in Washington, DC .
Written in English


Edition Notes

StatementLeigh Ann Smith and Richard L. Campbell.
SeriesNASA technical paper -- 3563
ContributionsCampbell, Richard L.
ID Numbers
Open LibraryOL21866680M

winglets are minimum. We observed induced drag reduced 10 to 15 percent linearly for 50 percent we observe slight increase in L/D compared to its prior to its preceding cant angles (that at 50 deg). However wing configuration with winglets has less induced drag compared to wings without winglets. The effects of the multi-winglets on drag at most of angles of attack are of small magnitude. It can be seen that for angles of attack up to 2, the device produces a slightly more drag than the basic wing. For higher angles, as in Fig.4, the reductions of the induced drag become more ex-.

Winglets reduce wake turbulence thus minimizing its potential effect on following aircraft. Shapes and sizes. Winglets come in different shapes and sizes with each type performing the same basic drag-reducing function. They have proven to be very effective even when retrofitted to aircraft originally designed in the s.   Aerodynamic drag force breakdown of a typical transport aircraft shows that lift-induced drag can amount to as much as 40% of total drag at cruise conditions and % of the total drag in take-off configuration. One way of reducing lift-induced drag is by using wing-tip devices.

coefficient results in a larger drag force reduction at low-aspect ratio. DESIGN PROCEDURE The present work has been undertaken to design a low aspect ratio wing-winglet wind tunnel model to be constructed and tested in the NASA LaRC 7 x 10 high speed tunnel, to confirm the numerical drag . The study on the effect of winglet shape in wing design has been a focus of many researchers. Nevertheless, the effect of cant angle on the wing performances at low Reynolds number has not been fully explored. This paper describes the effect of a single semi-circular shaped winglet attached with a rectangular wing model to lower the drag without increasing the span of the wing.


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Effects of winglets on the drag of a low-aspect-ratio configuration by Leigh Ann Smith Download PDF EPUB FB2

To help you understand the effects of winglets on the drag of a wing, we have performed some simple wind tunnel tests with a variety of winglet models.

The winglet design, construction, and testing was performed by three high school "shadows". The wind tunnel that was used is a low speed tunnel that has been used for several student projects.

configurations with little emphasis on low-aspect-ratio effects. Recently, Kuhlman et al. () in-vestigated winglet effects for low-aspect-ratio con-figurations, determining that the percentage drag reduction afforded by winglets depends only on the ratio of winglet length to wing span, not on aspect ratio or wing : Leigh Ann Smith, Richard L.

Campbell. Abstract. A wind-tunnel investigation has been performed to determine the effect of winglets on the induced drag of a low-aspect-ratio wing configuration at Mach numbers between and and a nominal angle-of-attack range from -2 deg to 20 deg.

Results of the tests at the cruise lift coefficient showed significant increases in lift-drag ratio for the winglet configuration relative to a Author: Richard L.

Campbell and Leigh Ann Smith. The performance of the low aspect ratio inboard wing can be improved by as much as 15 percent by using the vertical stabilizers as winglets. This effect should also be enhanced by the propeller if the ‘winglets’ are properly designed.

In the aerodynamic analysis, the outboard wing sections can be treated as separate, low aspect ratio surfaces. high aspect ratio wing-winglet configuration the drag reduction effect. o~ winglet twist and toe angle. Since there is a wealth of data about the Boeing KC aircraft fitted with winglets and because of the proven benefits of winglets on this tip loaded wing, a wing-winglet configuration similar to the KC was chosen as the base line for Author: Thomas T.

Moore. BMAX winglet has two tips vertically opposite to each other as compared to the 50 degree sweep of the multi-tip-2 winglet.

The multi-tip-3 winglet has shown a significant reduction in drag over the BMAX winglet, this due to the three vortices producing a vortex drag alleviating effect as Effects of winglets on the drag of a low-aspect-ratio configuration book to the two vortices in BMAX. In the foreground, a red blended winglet extends up from the port wing tip of a Boeing In the background, a yellow wingtip fence on the starboard wing of an Airbus A Wingtip devices are usually intended to improve the efficiency of fixed-wing aircraft.

There are several types of wing tip devices, and although they function in different manners, the intended effect is always to. Winglets certainly do change lift distributions and increase bending moments, as I found out all too well when I was assessing the effect of winglets on the F&DT characteristics of a wing a while ago, but I thought that they were installed primarily to reduce total aircraft drag by generating a net forward component of force, and that any.

Wingtip devices are intended to improve the efficiency of fixed-wing aircraft by reducing drag. Although there are several types of wing tip devices which function in different manners, their intended effect is always to reduce an aircraft's drag by partial recovery of the tip vortex energy.

Wingtip devices can also improve aircraft handling characteristics and enhance safety for following. Winglets are optimized for a particular configuration of wing, flight speed and profile and are usually ineffective, and may even have adverse effects on aircraft performance in other situations.

For example, the winglet increases profile drag while reducing induced drag; in conditions where profile drag is a major contributor to the total drag.

The measured inline drag and transverse lift forces on the fixed caisson at different drafts are presented and the effect of the fluid velocity and flow vorticity on the frequency contents in the. Interference drag shows up anywhere you have tight angles.

Airflow at these angles mixes and becomes turbulent, creating drag. With composites and new manufacturing technology, you can now blend winglets into the wing, eliminating interference drag and making the winglets even more efficient. to low induced drag and the wings with winglet have more surface area, which caused the friction drag to increase.

At high angle of attack, the induced drag increase and then the effect of winglet increase to reducing induced drag. It was found that the lowest drag coefficient; C.

Effect of Winglets on Performance and Handling Qualities of General Aviation Aircraft Article (PDF Available) in Journal of Aircraft 18(7) September with 1, Reads How we measure 'reads'.

Weight and CG control. To address the effects of both flutter and dynamic load, the weight and CG control of the winglet were considered carefully, including the location of the winglet lights and specifications for the painting and possible repair of the meet flutter requirements with minimal structural changes, additional wingtip ballast was mounted on the front spar to counteract.

Winglets Close-up of winglet on KC test aircraft, with attached tufts displaying flow of air over winglet surface. NASA Photo EC Winglets are one of the most successful examples of a NASA aeronautical innovation being utilized around the world on all types of aircraft.

Winglets makes the passage of air from the bottom of the wing to the lower pressure top of the wing more difficult, thus reducing induced drag. The big manufacturers explored offering winglet retrofit kits to their customers but at the time, it wasn't economical since fuel was so cheap.

drag. Profile drag is the drag due to the shape of the airfoil or wing section. It is a consequence of both the skin-friction drag due to air moving along the surface of the airfoil, as well as pressure drag, due to pressures acting over the front of a body not being balanced by those acting over its rear.

in less-intense tip vortices and lower induced drag. WINGLET EFFECTS Stretching wingspan or increasing aspect ratio certainly reduces induced drag. Designers, though, have to balance the benefits of less induced drag against the costs of structural weight increases, more parasitic drag.

For example, the C is based on the Boeingwhich has already been modified with winglets; therefore, that experience can inform the decisions regarding the C 19 Similarly, in the s the suitability of winglets on the KC was studied. 20 This previous work could help to inform a winglet retrofit decision today.

However, the. the parasite drag is small, but the induced drag increases very fast. At higher speeds, parasite drag increases but induced drag becomes small. This trade-off between para-site drag and induced drag is what makes the design of winglets interesting.

How do winglets reduce induced drag? Adding a winglet to a wing has a similar effect to adding.Taking friction into account, favors the classical wingtip at low lift coefficients, but the total drag of the winglet configurations will still be lower at higher lift coefficients.

For the flying wing, the winglets make a vertical fin obsolete, whose friction drag would have to be added to the drag of the conventional wing tip configuration.Low aspect ratio wings are usually used on fighter aircraft, not only for the higher roll rates, but especially for longer chord and thinner airfoils involved in supersonic flight.

Parasitic drag: While high aspect wings create less induced drag, they have greater parasitic drag, (drag due to shape, frontal area, and surface friction).