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Thursday, November 12, 2020 | History

2 edition of A study of the vortex flow over 76/40-deg double-delta wing found in the catalog.

A study of the vortex flow over 76/40-deg double-delta wing

A study of the vortex flow over 76/40-deg double-delta wing

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  • 22 Currently reading

Published by Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, National Technical Information Service, distributor in Hampton, VA, [Springfield, Va .
Written in English

    Subjects:
  • Computational fluid dynamics.,
  • Delta wings.,
  • Flow distribution.,
  • Planforms.,
  • Vortices.,
  • Wind tunnel tests.

  • Edition Notes

    StatementN.G. Verhaagen ... [et al.].
    SeriesICASE report -- no. 95-5., NASA contractor report -- 195032., NASA contractor report -- NASA CR-195032.
    ContributionsVerhaagen, N. G., Institute for Computer Applications in Science and Engineering.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15410055M

      In the study, the vortex and wake characteristics were computed for three classic wing designs: the elliptic wing, and wing designs developed in . Leading edge vortices on the upper surface of a delta wing can augment lift. Manipulating breakdown points of leading edge vortices can effectively change the delta wing’s lift and drag and generate attitude control torque. In this paper, a dynamic model of active flow control of vortex break down points is identified from wind tunnel data. In this paper we implement the immersed interface method to incorporate these jump conditions in a 2D numerical scheme. We study the accuracy, efficiency and robustness of our method by simulating Taylor-Couette flow, flow induced by a relaxing balloon, flow past single and multiple cylinders, and flow around a flapping wing.


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A study of the vortex flow over 76/40-deg double-delta wing Download PDF EPUB FB2

A low-speed wind-tunnel study of the flow about a 76/deg double-delta wing is described for angles of attack ranging from to 25 deg and Reynolds numbers. A study of the vortex flow over a 76/deg double-delta wing. Dye Visualization of the Vortical Flow Structure over a Double-Delta Wing.

Journal of Aerospace Engineering, Vol. 25, No. Skin friction fields on delta wings. 29 May | Experiments in Fluids, Vol. 47, No. A low-speed wind-tunnel study of the flow about a 76/deg double-delta wing is described for angles of attack ranging from to 25 deg and Reynolds numbers ranging from to Million.

The study was conducted to provide data for the purpose of understanding the vortical flow behavior and for validating Computational Fluid Dynamics by: 8. Get this from a library. A study of the vortex flow over 76/deg double-delta wing. [N G Verhaagen; Institute for Computer Applications in Science and Engineering.;].

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Alow-speed wind-tunnel study of the ow about a 76/deg double-delta wing is described for angles of attack ranging from to 25 deg and Reynolds numbers ranging from to Million.

The study was conducted to provide data for the purpose of understanding the vortical ow behavior and for validating Computational. A low-speed wind-tunnel study of the flow about a 76/deg double-delta wing is described for angles of attack ranging from to 25 deg and Reynolds numbers ranging from to Million.

The study was conducted to provide data for the purpose of understanding the vortical flow behavior and for validating Computational Fluid Dynamics methods. Abstract: A family of double-delta wings with leading-edge sweep combinations of 80/80,80///50 and 80/40 deg.

was tested in a small towing tank. The hydrogen bubble technique was used to visualize the vortex patterns above the wings over a range of Reynolds numbers (based on centerline chord) from toThe effects of variations in incidence and leading-edge kink.

Vortex interaction and breakdown over double-delta wings 3 February | The Aeronautical Journal, Vol. No. A study of the vortical flow over a delta wing with a leading edge extension. In this study, the aim is to exhibit vortical behaviors of flow on double delta wings having 70° strake sweep angle and kink angles of °, ° and ° using dye visualization technique in a water channel.

Experiments were performed at Reynolds numbers based on the chord length Re = 10, for angle of attack in the range 5° to 35°. It was observed that the secondary vortex is dominant on flow characteristics of double delta wings at low Reynolds numbers. The strengths of vortices increase with increases of both the wing sweep angle and Reynolds number.

Furthermore, the location of wing vortex breakdown moves farther downstream as the wing sweep angle increased. performance of wing configurations with LE vortex systems lies in manipulating the flow by active and passive control mechanisms.

The latter ones can influence the flow through generating additional stabilizing vortices, i.e. from canard-wing or double-delta wing configurations, and through unsteady excitation by flow induced motions of a.

A study of the vortex flow. over a 76/deg double-delta wing. AIAA Paper,AIAA 10 Verhaagen N G. Effects of Reynolds number on flow over 76/ degree double-delta wings. Verhaagen, N.G. Effects of Reynolds number on the flow over 76/40 - deg double-delta wings, AIAA 17th App Aero Dyn Conf,pp – Hebbar, S.K., Phatzer, M.F.

and Fritzelas, A.E. Reynolds number effects on the vortical flow structure generated by a double-delta wing, Experiments in Fluids,28, pp –   A double delta wing model with sweep angles of Λ = 70 ° and 50° (with the kink at mid-chord, as shown in Fig.

2), and a simple slender delta wing model of Λ = 70 ° were tested. Both models had a chord length of c = mm and a thickness-to-chord ratio of t / c = %.Both models were manufactured from aluminum sheet and had a deg bevel on leading edges, thus producing a sharp.

core flow is characterized by an instability type referred to as helical mode instability [4], [7]. Fig. 1: Delta wing vortex formation: main delta wing flow features (a) and vortex bursting characteristics (b) [8]. The manipulation of the characteristic vortex flow instabilities is of great interest due to the.

the effect of Angle Of Attack and Mach number on vortex flow structure and pressure. In this study we are varying the angle of attack from 10º to 25º and for each angle of attack we are considering three Mach numbers (,) representing subsonic, transonic and supersonic conditions.

Key Words: CFD, Double Delta Wing, Vortex flow 1. Mary, in Engineering Turbulence Modelling and Experiments 5, Test case. A 70° sweep angle delta wing with sharp leading-edges has been chosen for the study, because the detailed experimental data of Mitchell et al.

(b) are available. The flow configuration is quite realistic: the Reynolds number, based on the root chord (c = m), and the upstream velocity (u ∞ = 24ms. Numerical simulations were performed on the massively separated flows of a 76/40° double delta wing using detached-eddy simulation (DES).

A new type of cross-flow vortex is suggested. A vortex was initially generated near the junction of the strake and wing, which then moved towards the wing tip at certain wavelength and speed.

Analyses were made in detail on the mechanism of the generation. A delta wing is a wing shaped in the form of a triangle. It is named for its similarity in shape to the Greek uppercase letter delta (Δ).

Although long studied, it did not find significant applications until the Jet Age, when it proved suitable for high-speed subsonic and supersonic the other end of the speed scale, the Rogallo flexible wing proved a practical design for the hang. A novel vortex control technique, known as recessed angled spanwise blowing, has been investigated in a water tunnel on a beveled deg delta wing, Three pairs of blowing ports, located on the.

A Conceptual Study of Leading-Edge-Vortex Development by Blowing”, (). A Study of the Vortex Flow over a 76/deg Double-Delta Wing”, (). A Theory of the Flow Past a Slender Delta Wing with Leading Edge Separation”.

Nick G. Verhaagen, Steven H.J. Naarding, "Experimental and Numerical Investigation of Vortex Flow over a Sideslipping Delta Wing", Journal of Aircraft, VolNovember O.V. Cavazos, A Flow Visualization Study of LEX Generated Vortices on a Scale Model of a F/A Fighter Aircraft at High Angles of Attack.

The behaviour of the flow over slender delta wings under transonic conditions is highly complex. With the occurrence of a number of shocks in the flow the behaviour of vortex breakdown is quite different to that for subsonic flow.

This investigation considers this behaviour over the 65o sharp leading edge delta wing used in the 2nd. VORTEX FLOW. DELTA WING. LIFT. SHARP LEADING EDGE. Available Downloads Name Type pdf STI cloud_download.

content_copy. visibility. This document could not be previewed in your browser. Try downloading it insead. In this flow visualization result, the dominant feature of the AOA and Reynolds number effect on the vortical flow structure over the double-delta wing has been observed.

With increasing Reynolds number, the distance between the vortex trajectory and the model surface becomes smaller. As mentioned in the beginning of Section 5, the sharp leading-edge separation occurs as a spiral vortex sheet that emanates from the highly swept leading edge and rolls up upon itself to form a vortex core over the suction side of the wing.

A sketch of this vortex flow, simplified to only the primary vortex, is shown in Fig. The close. High-resolution skin friction fields in separated flows over a 65° delta wing and a 76/40° double-delta wing with different junction fillets are obtained by using quantitative global skin friction.

The wing is modeled mathematically by a single horseshoe-shaped vortex (black line) Flow visualization showing that the horse-shoe vortex is a good approximation of real flow The stronger the vortex, the higher the lift Wingtip or trailing vortices Bound vortex.

The development of and interaction between vortices over a yawed delta wing with leading-edge extension (LEX) were analyzed by flow visualization, and the results show that with increased α, coiling of the wing and LEX vortices was intensified, under sideslip, the coiling, the merging, and the diffusion of the wing and LEX vortices increased.

The flow that occurs from the canard is close enough to the main wing to produce a good interaction for the aircraft model. At AoA 30°, canard vortex stream flows over the wing to the rear. The vortex flow from the main wing flows sideways along the back leading edge, and undergoes vortex core breakdown at x/L = Streamlined wall shear.

At 55 degrees sweep the spanwise component of flow is strong enough to push the axial component of the vortex toward the tip thereby creating a stabile, non expanding, cone shaped vortex. Actually, on a delta wing, there is no distinct tip vortex, the LEV starts near the nose of the airplane and runs along the top surface to the tip, where it.

However, vortex flow meter low-flow cutoff is actually a far more severe problem. If the volumetric flow rate through a turbine flow meter falls below the minimum linear value, the turbine continues to spin, albeit slower than it should. If the volumetric flow rate through a vortex flow meter falls below the low-flow cutoff value, however, the.

Investigations were performed on an 81°/45° sweep double-delta wing at a freestream velocity of 20 m/s. Experiments consisted of the measurement of forces, static pressures, and surface flow visualizations.

Effect of the leading edge shapes of the double-delta wing was studied. ciency, CFD analysis was performed on several three dimensional wing-vortex flap combinations that incor-porated the cross sectional geometry detailed above. Wing seeps of 30 and 60 degrees were considered in the study as well as an examination of the three dimensional flow effects caused by including a gap in the flap geometry.

Flap Design Process. These vortices are formed because the wing develops lift. The pressure on the top of the wing is lower than on bottom, causing air to move around the edge of the wing from the bottom surface to the top. The boundary layer on the wing separates as a shear layer that rolls up into a vortex attached to the tip of the wing (Fig.

Since the velocity. the velocity and turbulent flow field over a Delta wing when vortex breakdown occurs. Schiavetta et al. [4], studied the VB phenomenon over different Delta wings with the use of Detached Eddy Simulation (DES), coupled with the one equation Spalart Almaras turbulent model, and Unsteady Reynolds Averaged Navier Stokes equations.

翼平面形(よくへいめんけい)とは、翼を真上から見た形状のこと。 翼に言及していることが明らかな文脈では単に平面形ともいう。この項では、主に航空機の翼平面形について解説する。. flow behaviour both experimentally and computationally over a specified 65° delta wing geometry. The work. of VFE-2 built on the first International Vortex Flow Experiment (VFE-1) [] carried out in the late eighties, which was used to validate the inviscid CFD codes of.

The higher-pressure air below a wing spills up over the wing tip into the area of lower-pressure air above. The wing’s forward motion spins this upward spill of air into a long spiral, like a small tornado, that trails off the wing tip.

These wing tip vortices create a form of pressure drag called vortex drag. Investigation of Unsteady Vortex Flow Over A Maneuvering Delta Wing." I have examined the final copy of this dissertation for form and content and recommend that it be accepted in partial fulfilment of the requirements for the degree of Doctor of Philosophy, with a major in Aerospace Engineering.

& - Ahmad D. Vakili, Major Professor. An experimental study was conducted inthe Virginia Tech Stability Wind Tunnel to determine surface pressures over a sweep delta wing with three vortex flap designs. Extensive pressure data was collected to provide a base data set for comparison with computational design codes and to allow a better understanding of the flow over vortex flaps.The fluid dynamic properties of the flow over a delta wing are still not yet fully understood.

Recent numerical simulations have shown that the stability o Experimental investigations on vortex breakdown over delta wings with Doppler global velocimetry - IEEE Conference Publication.Flow Research is currently working on a new study called “The World Market for Vortex Flowmeters, 4th Edition,” scheduled to be published by Flow Research in July For more information, visit Flow Research’s vortex flowmeter Web portal at