design of a low aspect-ratio wing for use in an experimental ... - garteur

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ROYAL AEROSPACE ESTABLISHMENT
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DESIGN OF A LOW ASPECT-RATIO
WING FOR USE IN AN EXPERIMENTAL
INVESTIGATION OF TURBULENT
SHEAR LAYERS
by
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M.C.P. Firmin
M. A. McDonald
Procurement Executive, Ministry of Defence
Farnborough, Hants
GARTEUR No. AD(AG07)/TP032,

GARTEUR Working Paper AD(AG07)/TP032
DESIGN OF A LOW ASPECT-RATIO WING FOR USE IN AN EXPERIMENTAL
INVESTIGATION OF TURBULENT SHEAR LAYERS
M. C. P. Firmin
M. A. McDonald
Aerodynamics Department,
Royal Aircraft Establishment,
Farnborough, Hants, England
SUMMARY
The design of a wing for the validation and improvement of calculation
methods for three-dimensional flows has been undertaken by RAE following guidelines
agreed by the GARTEUR Action Group AD(AG07).
The wing design is arranged so that detailed results can be obtained for
the boundary layer and wake flow in conditions of:
(a)
(b)
extreme three-dimensionality for at least part of the flow, and
separation near the trailing edge of the upper surface.
This paper details the work done towards the design.
August 1987

LIST OF CONTENTS
Page
1 INTRODUCTION
3
2 DESIGN PROCESS
3 PROGRAMS USED
3.1 BAe (SPARV) panel method
3.2 RAE aerofoil method
4 CALCULATIONS
4.1 Development of wing
4.2 Final design for incipient separation
4.3 Design for separated flow
5 CONCLUSIONS
Acknowledgment
Table 1
References
List of illustrations :
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Original proposal
Aerofoil section
Calculated surface pressure distributions
Streamwise sections - wing design H3
Calculated shape factors for boundary-layer development
(a)
(b)
Upper surface
Lower surface
Calculated skin-friction distribution
(a)
(b)
Upper surface
Lower surface
Calculated surface streamlines
(a)
(b)
Upper surface
Lower surface
Development of boundary-layer shape factor on upper
surface of NACA 4412 aerofoil
Correlation of
for wing design
Selection of revised wing sections
Sketch of revised experimental set-up