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Friday, November 27, 2020 | History

3 edition of Analytical observations on the aerodynamics of a delta wing with leading edge flaps found in the catalog.

Analytical observations on the aerodynamics of a delta wing with leading edge flaps

Analytical observations on the aerodynamics of a delta wing with leading edge flaps

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Published by Stanford University, Dept. of Aeronautics and Astronautics, Joint Institute for Aeronautics and Acoustics, National Technical Information Service, distributor in Stanford, CA, [Springfield, Va .
Written in English


Edition Notes

Statementby Sejong Oh and Domingo Tavella
SeriesJIAA TR -- 74, NASA contractor report -- NASA CR-177022
ContributionsTavella, D. A, Joint Institute for Aeronautics and Acoustics
The Physical Object
FormatMicroform
Pagination1 v
ID Numbers
Open LibraryOL14985049M

  The prominent aerodynamic feature of the delta wing is the dominant leading edge vortex pair on the lee side, particularly over wings with sharp leading edges.   Common airfoils are designed and optimised for 2d flow conditions, wich just doesn't really apply in case of a delta wing. Deltas do just fine with a thin symmetric wing section, some fine tuning can be done by chosing the leading edge radius. The inner wing has those flaps deployed and, consequently, a suction peak near the leading edge and low pressure on the whole upper side. This will also suck in air from the side. As a consequence, the flow moving towards the outer wing will see a similar upward acceleration as does the flow streaming towards the inner wing, plus a sideways. At a high angle of attack, the leading edge creates strong vortices that allow a delta wing to maintain lift at very high angle, which is advantageous in combat. The high sweep angle reduces aerodynamic drag in supersonic flight. Disadvantages: High drag and generally poor performance in subsonic flight. High drag in hard turns.


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Analytical observations on the aerodynamics of a delta wing with leading edge flaps Download PDF EPUB FB2

The effect of a leading edge flap on the aerodynamics of a low aspect ratio delta wing is studied analytically. Analytical observations on the aerodynamics of a delta wing with leading edge flaps Author: Sejong Oh ; D A Tavella ; Joint Institute for Aeronautics and Acoustics.

A series of wind tunnel tests were run on 60 and 75 deg sweep delta wings to examine the effectiveness of leading-edge vortex flaps. Test results showed that leading-edge vortex flaps. The aim of this study is to research the aerodynamic improvement of delta wing in low Reynold’s number region to develop an applicative these air vehicle.

As an attractive tool in delta wing, leading edge flap (LEF) is employed to directly modify the strength and structure of vortices originating from the separation point along the leading : Tadateru Ishide, Mao Itazawa.

Investigation of leading-edge flap performance on delta and double-delta wings at supersonic speeds [mic Lift augmentation on a delta wing via leading edge fences and the Gurney flap [microform] / by Mark D. B Analytical observations on the aerodynamics of a delta wing with leading edge flaps [microform] / by Sej.

In contrast to most recent studies, low angles of attack were emphasized, with most data in the range of 5–20 deg. Delta wings of and deg leading-edge sweep and deg windward-side. The aerodynamic characteristics of delta wings at lifting conditions have been evaluated for the effects of wing leading-edge sweep, leading-edge bluntness, and wing thickness and camber and then summarized in the form of graphs which may be used to assess the aerodynamics in the preliminary design process.

Em. Recent developments in delta wing aerodynamics are reviewed. For slender delta wings, recent investigations shed more light on the unsteady aspects of shear-layer structure, vortex core, breakdown and its instabilities. For nonslender delta wings, substantial differences in the structure of vortical flow and breakdown may by: Flapping Wings and Aerodynamic Lift: The Role of Leading-Edge Vortices.

The role of leading-edge vortex (LEV) in enhancing aerodynamic lift during flapping flight is discussed. The LEV is generated from the balance between the pressure gradient, the centrifugal force, and the Coriolis force in the momentum equation. Experimental Aerodynamics Delta wing history •!Until the s the vast majority of aircraft featured rectangular, trapezoidal or elliptical wings.

•!Delta wings started being studied in the s by Alexander Lippisch in Germany. •!Lippisch wanted to create tail-less aircraft, and Delta wings were one of the solutions he Size: 2MB. The primary advantage of the delta wing is that, with a large enough angle of rearward sweep, the wing’s leading edge will not contact the shock wave boundary formed at the nose of the fuselage as the speed of the aircraft approaches and exceeds transonic to supersonic speed.

A low-speed wind-tunnel investigation is presented, characterizing the effect of plain trailing-edge flaps on 65 and 70 deg sweep delta wings.

Four flap angles and three hinge locations were evaluated. The leading-edge suction analogy was extended to allow estimation of the effect of flaps on both the attached flow and vortex lift by: 5.

The effect of apex flap and tip flap, deflected both independently and jointly, on the vortex flow and lift generation of a 65 deg-sweep delta wing was investigated experimentally. The drooped apex flap produced a higher lift at medium-to-high angle of attack regime and also a delayed by: 1. Request PDF | Leading-Edge Tubercles on Swept and Delta Wing Configurations | The effects of leading-edge (LE) tubercles on the aerodynamic characteristics of the flipper, swept and delta wings.

Aerodynamic Flow Characteristics of Utilizing Delta Wing Configurations in Supersonic and Subsonic Flight Regimes usually always exhibit a noticeable sweep angle (usually rearward, and rarely forward sweep). For structural reasons, as well as aerodynamic, variations of delta wings are found in almost every supersonically-capable aircraft.

The typical angle of attack for maximum lift of a delta wing is about 35°, which is much higher than for a two-dimensional airfoil. The delta wing is, therefore, suitable for highly maneuverable aircraft. In this paper, experimental results for delta wings is by: Analytical Observations on the Aerodynamics of a Delta Wing with Leading Edge Flaps - S.

OH and D. TAVELLA Prospects for Destructive Self-Induced Interactions in a Vortex Pair Due to Sinusoidal Disturbances - V.J. ROSSOW   An investigation of the tabbed vortex flap. Keith D. Hoffler and Analytical observations on the aerodynamics of a delta wing with leading edge by: An analytical method for predicting the longitudinal aero- dynamic characteristics of externally blown flap configurations is described.

Two potential flow models make up the prediction method: a wing and flap lifting-surface model and a turbofan engine wake model. A vortex-lattice lifting-surface method is used to represent the wing and File Size: KB.

The highly swept profile of a delta wing facilitates the generation of vortex systems due to leading-edge separation. Previous works on flows over a delta wing of various profiles cover a wide range of Mach numbers and angles of attack. Since the vorticity may be considered the only source of aerodynamic forces at low MachCited by: 7.

The Behaviour of the Leading-Edge Vortices over a Delta Wing Following a Sudden Change of Incidence By N. LAMBOURNE, D. BRYER and J. MAYBREY Aerodynamics Division N.P.L.

Reports and Memoranda No. * March, Size: 2MB. The hinged leading edge or droop nose or leading edge flap is a mechanical device that increases the leading edge camber and therefore C Lmax and α stall of the wing (see Figure ).The device reduces the stalling speed and can also reduce roll instability at stall.

Mechanically it is a very simple device and has limited impact on drag when retracted when compared to. Recent supersonic studies (refs.

82 and 83) have examined delta wing aerodynamics in terms of upper and lower surface contributions and have assessed available prediction methods for estimating leading- edge vortex aerodynamics for planar and cambered delta wings. Subsonic Aerodynamics of Airfoils and Wings Introduction In this chapter we discuss the subsonic aerodynamics of airfoils and wings.

We look at the basic aerodynamics mainly from an inviscid point of view. Generally, this is a reasonable starting point for thinking about aerodynamics in attached flow. Traditionally, the methods used to makeFile Size: 2MB. Experimental investigation of aerodynamic control on a 35° swept flying wing by means of nanosecond dielectric barrier discharge (NS-DBD) plasma was carried out at subsonic flow speed of 20–40 m/s, corresponding to Reynolds number of × 10 5 – × 10 control condition, the plasma actuator was installed symmetrically on the leading edge of the by: REYNOLDS NUMBER, COMPRESSIBILITY, AND LEADING-EDGE BLUNTNESS EFFECTS ON DELTA-WING AERODYNAMICS 3 vortex will be affected by leading-edge radius and will change with Mach number, Reynolds number, and angle of attack.

While the focus of this work is on steady flows, dynamic effects could also be significantly affected by the blunt leading Size: KB.

A series of 65° sweep delta wings with different leading edges, designated as the standard model VFE-2, are introduced by the AVT task group of the Research and Technology Organization (RTO) of the present simulation, the VFE-2 model with sharp leading edge is chosen in order to reduce the uncertainty caused by Reynolds number, turbulence Cited by: 7.

Colloq., droops") found: OCLC WorldCat, May 9, (titles: Analytical observations on the aerodynamics of a delta wing with leading edge flaps, ; Subsonic investigation of leading-edge flaps designed for vortex- and attached-flow on a high-speed civil transport configuration, ; Effects of asymmetric leading edge flap deflection on.

A discussion of the pros and cons of delta wings (see schematic in Figure ) is given in Appendix C, The delta wing, and will not be elaborated on here, other than that they are planform shapes intended for high-subsonic or supersonic aircraft and not low-subsonic though it is certainly possible to use delta wings for low-speed airplanes (as evident by the Dyke Delta.

an identical clipped delta planform with an inboard leading edge swept back 65 ° and an outboard leading edge swept back 50 °.

The trailing edge was swept for-ward 25 °. Tile leading-edge flaps were deflected -4 °,-2 ° (cambered wing only), 0 °, 5°, 10 °, and 15 °, and the trailing-edge flaps were deflected °, °,File Size: 3MB.

Figure 10 shows results for a thick wing with a swept trailing edge. This is a plot of AC versus x and the wing is at an angle of attack of °. The leading-edge vortex sheet is assumed to be shed from the wing leading edge.

Because of the near wake problem discussed earlier, the File Size: 4MB. leading edge, reversed delta planform wing, were carried out by numerical and experimental methods. Results show an increase of the lift and hence lift-to-drag ratio with decreasing ground clearence. Lift-to-drag ratios of 30 are observed for h/b=, which double the values of those for the ground-free case.

No major. As the angle of attack increases, the leading edge of the wing generates a vortex which energises the flow on the upper surface of the wing, delaying flow separation, and giving the delta a very high stall angle.

A normal wing built for high speed use. The problem is that such wings may be able to sustain attached flow next to broken-down delta-wing vortices, or stall like two-dimensional wings, while shedding vortices with generators parallel to their leading edge.

To address this situation we studied the flow field over diamond-shaped planforms and sharp-edged finite by: 1. Close Drawer Menu Close Drawer Menu Menu. Home; Journals. AIAA Journal; Journal of Aerospace Information Systems; Journal of Air Transportation; Journal of Aircraft; Journal of Guidance, Control, and Dynamics.

Experimental studies of leading edge vortex control of enAuthor: K. Sibilski, A. Żyluk, W. Wróblewski. Mangler, K.W. and Smith, J.H.B., “A Theory of the Flow Past a Slender Delta Wing with Leading Edge Separation”, Proceedings of Royal Society, A, vol. Cited by: 5. I simulated a delta wing and a straight wing in xflr5 with the same profile, wing area and airspeed (very low airspeed.

around 10 m/s. it's for a model aircraft). The straight wing was operating at nearly the lift coefficient of the 2d airfoil at a particular angle of attack, but the delta wing was operating at a lift coefficient far below the.

DELTA WING AERODYNAMICS – Requirements from CFD and experiments I I GursulGursul (University of Bath), (University of Bath), M. Allan and K. Badcock (University of Glasgow) M.

Allan and K. Badcock (University of Glasgow) Integrating CFD and Experiments, Sept 8. At the beginning of the flow — for instance, at the leading edge of an airplane's wing — this boundary layer describes a laminar flow; but the width of the layer increases as the air moves along the surface, and at some point it becomes turbulent.

These and a number of other factors contribute to the coefficients of drag and lift. AN INTRODUCTION TO FLAPPING WING AERODYNAMICS book is to address recent developments in flapping wing aerodynam-ics.

This book extends the work presented in Aerodynamics of Low Unsteady Aerodynamic Mechanisms in Flapping Wings Leading-Edge Vortices (LEVs) Rapid Pitch-Up Nowadays, aeronautics discovers new ways of flights near the critical regimes, unconventional aircraft forms, utilizing the micro–electro-mechanical technologies in flow and aircraft control, adaptive and morphing structures, using the structures and controls based on the biological principles, developing highly flexible structures, etc.

Before deployment, these new Author: Jozsef Rohacs.The Aerodynamics of Low Sweep Delta Wings Jose M. Rullan Abstract The aerodynamics of wings with moderately swept wings continues to be a challenging and important problem due to the current and future use in military aircraft. And yet, there is very little work devoted to the understanding of the aerodynamics of such wings.