Hostname: page-component-cd9895bd7-8ctnn Total loading time: 0 Render date: 2024-12-25T05:45:59.805Z Has data issue: false hasContentIssue false
  • English
  • Français

Pressure fluctuations caused by transonicshock/boundary-layer interaction

Published online by Cambridge University Press:  04 July 2016

A. R. G. Mundell  and
D. G. Mabey
Get access Rights & Permissions [Opens in a new window]

Summary

An analysis of an extensive series of unsteady and steady pressure measurements at transonic speeds on a rigid 12% thick NACA 16 series aerofoil reveals a useful classification of the type of excitation characteristics of particular flow regions.

The pressure fluctuation measurements suggest that when the shock from the aerofoil reaches the tunnel roof, serious interference (both dynamic and static) occurs.

The RAE 2 ft × 1½ ft Transonic Tunnel used for the tests has low levels of flow unsteadiness at low frequencies, making it a useful facility for basic research in time-dependent aerodynamics.

Type
Research Article
Information
The Aeronautical Journal , Volume 90 , Issue 897 , September 1986 , pp. 274 - 282
Copyright
Copyright © Royal Aeronautical Society 1986 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

*

Aerodynamics Department, Royal Aircraft Establishment, Farnborough.

†

Aerodynamics Department, Royal Aircraft Establishment, Bedford.

References

1. Mundell, A. R. G. and Moss, G. F. Some wind tunnel measurements of wing surface pressure fluctuations at high subsonic speeds at conditions appropriate to buffeting. RAE unpublished data.Google Scholar
2. Tijdeman, H. Investigations of the transonic flow around oscillating aerofoils. NLR TR 77-09OU, 1977.Google Scholar
3. Ashill, P. R. and Fulker, J. R. A study of the factors influencing shock induced separation on swept wings. RAE Technical Report 83088, 1983.Google Scholar
4. Owen, T. B. Techniques of pressure fluctuation measurements employed in the RAE low speed wind tunnels. AGARD Report 172, ARC 10780, 1958.Google Scholar
5. Mabey, D. G. Flow unsteadiness and model vibration in wind tunnels at subsonic and transonic speeds. ARC CP 1155 1971, RAE Technical Report 70184, 1970.Google Scholar
6. Mabey, D. G. Some remarks on the design of transonic tunnels with low levels of flow unsteadiness. NASA CR 2722, 1976.Google Scholar
7. Pearcey, H. H. and Holder, D. W. Simple methods for the prediction of wing buffeting resulting from bubble type separations. ARC 23884, NPL Aero Report 1024, 1962.Google Scholar
8. Mabey, D. G. Analysis and correlation of data on pressure fluctuations in separated flow. AIAA Journal, 1972.Google Scholar
9. Cherry, N. J., Hillier, R. and Latour, M. E. M. P. The unsteady structure of two-dimensional separated and reattaching flows. Journal of Wind Engineering and Industrial Aerodynamics, 1983, 11, 95–105.Google Scholar
10. Ladson, C. L. Chordwise pressure distributions over several NACA 16 series aerofoils at transonic Mach numbers up to 1-25. NASA TIL 6454, NASA Memo 6-1-59L, 1959.Google Scholar
11. Mabey, D. G. Boundary layer transition measurements on the AEDC 10° cone in three RAE wind tunnels and their implications. R&M 3821, 1978, RAE Technical Report 76077, 1976.Google Scholar
12. Rossiter, J. E. Wind tunnel experiments on the flow over rectangular cavities at subsonic and transonic speeds. RAE Technical Report 64037, 1964.Google Scholar
13. Mabey, D. G., Welsh, B. L. and Cripps, B. E. Periodic flows on a rigid 14% thick biconvex wing at transonic speeds. RAE Technical Report 81059, 1981.Google Scholar
14. Lee, B. H. K. and Ohman, L. H. Unsteady pressure and force measurements associated with transonic buffeting on a two-dimensional supercritical aerofoil. Canadian NAE AN14, 1983.Google Scholar
15. Timme, A. Effects of turbulence and noise on wind-tunnel measurements at transonic speeds. Paper 5. AGARD R-602 Fluid motion problems in wind tunnel design, 1973.Google Scholar
16. Roos, F. W. Some features of the unsteady pressure field in transonic aerofoil buffeting. AIAA J. Aircraft, 17, 11, 781–788.Google Scholar
17. Mabey, D. G. A review of some recent research in time-dependent aerodynamics. Aeronautical Journal of Royal Aero Soc, February 1984.Google Scholar
18. Mabey, D. G. Buffet definition and criteria Chapter 7. The effects of buffeting and other transonic phenomena on manoeuvring combat aircraft. AGARD Advisory Report 82, 1975.Google Scholar
19. Rose, R. and Nicholas, O. P. Flight and wind tunnel measurements of pressure fluctuations on the upper surface of a Venom aircraft with a sharp leading edge. ARC CP 1032, 1967.Google Scholar