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Wednesday, May 20, 2020 | History

2 edition of study of flows over highly-swept wings designed for manoeuvre at supersonic speeds found in the catalog.

study of flows over highly-swept wings designed for manoeuvre at supersonic speeds

P. R. Ashill

study of flows over highly-swept wings designed for manoeuvre at supersonic speeds

by P. R. Ashill

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  • 32 Currently reading

Published by HMSO in London .
Written in English


Edition Notes

Statementby P. R. Ashill, J. L. Fulker, M.J. Simmons.
SeriesTechnical memorandum aero -- 2147
ContributionsFulker, J. L., Simmons, M. J., Royal Aerospace Establishment.
ID Numbers
Open LibraryOL13806178M

Educational site for teaching of Aerodynamics, Gas Dynamics, Fluid Mechanics, Propulsion and Aircraft Performance at a University Level. Supersonic flow Fluid motion in which the Mach number M, defined as the speed of the fluid relative to the sonic speed in the same medium, is more than unity. It is, however, common to call the flow transonic when 5. See Mach number Mach waves A particle moving in a compressible medium, such as air, emits acoustic.

In the present study, high subsonic and supersonic flows over a half-model 60° fixed and pitching delta wing are investigated experimentally, using surface pressure measurements. Also, a numerical simulation of the flow over the wing in the wind tunnel is performed for comparing and verifying the by: 7.   EU-funded researchers evaluated control techniques of air flow over aeroplane wings during supersonic flight. The optimal wing design developed .

In order to have laminar flow over the wings which helps in friction drag reduction, a number of airfoil designs have been proposed from the past to the latest winglets. But if we design a laminar flow wing for supersonic aircraft, the wing should be very thin which . The distribution of pressure over the elastic wing due to twist may be determined by applying known conical-flow solutions for supersonic flow. In t-heIknearizedtheory, the principle of superposition of various solutions maybe used to satisfy the particular boundary conditions of the problem. For the elastic wing, the flow field may be Cited by: 4.


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Study of flows over highly-swept wings designed for manoeuvre at supersonic speeds by P. R. Ashill Download PDF EPUB FB2

Therefore detailed experimental studies are needed of flows over supersonic manoeuvre wings to validate Computational Fluid Dynamic (CFD) methods and to identify flow features not adequately modelled.

This paper describes an investigation with these aims, which was performed in the Bft x 8ft Wind Tunnel, RAE Bedford, on half models of two wing-body con. Flight Experiment Smoothes Flow Over Supersonic Wings. In a series of flight tests, NASA engineers have smoothed the flow over the surface of an FXL wing flying at supersonic speeds (faster than sound), bringing to a successful conclusion a historic achievement in high-speed.

By maintaining laminar, or smooth, non-turbulent flow at the surface of the wing, thereby reducing drag, it is possible to increase an aircraft's fuel efficiency. To test this concept, NASA is using an experimental wing surface attached to the NASA FXL at the NASA Dryden Flight Research Center in Edwards, Calif.

supersonic speeds will also be required to maneuver at supersonic speeds; this is the problem addressed in the present report. Supersonic wing design methodology presently in use in this country was developed for designing supersonic transports and is based on linear aero- File Size: 3MB.

A brief survey is made of the way the flow develops about wings with leading edges swept at about 50° as the stream Mach number rises from a subsonic to a supersonic value.

The shock pattern which occurs may be by: A wind-tunnel investigation into supersonic free-stream flows over two wing-body configurations, having wings of different design, suitable for combat aircraft, is described. DESIGN STUDY OF A SUPERSONIC BUSINESS JET WITH VARIABLE SWEEP WINGS thrust required for a given takeoff mass.

For cruise flight this leads to a lower optimum cruise altitude; in supersonic flight both the lift of the wings and the thrust of the engines are basically proportional to the air density, and as.

control/maneuver slender bodies in supersonic flight, this paper presents a detailed study of a two dimensional laminar supersonic flow over a flat plate with a surface protrusion. The. In this chapter we discuss the aerodynamics of swept wings in transonic flow. To demonstrate the merits of swept-back wings, simple sweep theory is presented.

It is shown why a swept wing can experience local supersonic flow while still being in subcritical conditions, thereby postponing the onset of strong shock waves and drag : Roelof Vos, Saeed Farokhi.

Lift and Drag Characteristics of Delta Wings at Supersonic Speeds Figure 1. Lift Characteristics of Delta Wings 50 2. Form Drag of Delta Airfoils Whose Leading Edges are Inside the Mac'r«. Cone, 50 3.

Lift-Drag Eatio of Delta and Rectangular Wings 51 4.» Maximum Lift-Drag Ratio - Delta Wings, 51 5. Maximum Lift-Drag Eatio 51 Size: 1MB. arrow and diamond wings, through the use of the geometric and flow correlation parameters.

This paper presents the results of a combined ex- perimental and theoretical study of the aerodynam- ics of delta wings at supersonic speeds along with a preliminary delta wing selection and design philoso- phy.

At speeds of about Mach you begin to get wave drag because the flow over the wing is not uniform, and in some regions you have supersonic flow. The wave drag is much less for swept wings, roughly in proportion to the aspect ratio.

So when you are trying to push the plane to Mach 1, swept wings. Effect of Wing Geometry on Lift at Supersonic Speeds 17 Journal Hence the study is designed to create a design table which enables a However at supersonic speeds, the nature of air flow changes and hence these benefits are lost along with it as indicated in Ref.

[1].File Size: 1MB. The numerical method of thin wings with arbitrary sideslip at subsonic and supersonic speeds Computers & Fluids, Vol. 10, No. 2 Symmetric flow characteristics of thin rectangular wingsCited by: W.H.

Mason Supersonic Aerodynamics 7/31/16 The best paper to read on the B is by Erickson.1 The airplane had a poor safety record. In part this was because the tires were very small to allow the gear to fit in the fuselage.

If we think of the oblique shock as a normal shock inclined to the flow at some shock angle s, then the normal shock relations can be applied across the shock in a direction perpendicular to the shock, and the flow component parallel to the shock remains unchanged.

The resulting Mach number and speed of the flow decrease across the shock wave. For the Mach number change. Flying Almost Supersonic Means The Air's Going Supersonic. You know that the air accelerates as it travels over the top of a wing - it's a basic part of Bernoulli's lift.

So, if you're flying near the speed of sound - say Mach.8, the air flowing over the wing could speed up to Mach 1. Now you have supersonic flow.

Why a sweptback wing is better suited to supersonic flight than straight wing Wings, Triangular 'Study of lee-side flows over conically cambered delta wings at supersonic speeds' -- subject(s.

Supersonic Flows Over Wedges and Cones The generation of oblique shocks is illustrated by the examples of flow over wedges (two-dimensional flow) and cones (three-dimensional flow).

It is shown how the oblique shock relations can be used to calculate the flow properties on the downstream side of an oblique shock given the free stream Mach.

Clearly, the message portrayed in figure is that the wings of aircraft designed to penetrate into the low-supersonic speed range should be thin and swept. These purely aerodynamic considerations for choosing a wing of low drag do not necessarily result in an optimum wing for a given airplane.

In view of the problems involved in the design of hypersonic aircraft great interest has arisen in recent years as to the behavior of wings in fast supersonic flows.

Two main approaches have been used: a study of hypersonic flow around traditional wings, and a search for new configurations with optimum aerodynamic properties. Aerodynamic [1, 2], heat-transfer [3], and stability investigations Author: V.

V. Kravets, N. V. Trifonova, A. I. Shvets.Computation of Supersonic Flow over Flying Configurations is a high-level aerospace reference book that will be useful for undergraduate and graduate students of engineering, applied mathematics and author provides solutions for three-dimensional compressible Navier-Stokes layer subsonic and supersonic flows.The WIND code with zonal boundary conditions was exercised to determine the supersonic flow over the geometry shown below, and compared with data as presented by Smith (Ref.

1). The test case selected was for an inlet flow Mach number of (Re=,/in.). At these tunnel conditions the flow should be laminar over most of the upstream plate.