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Transonic shockwave/turbulent boundary layer interactions on a porous surface

Published online by Cambridge University Press:  04 July 2016

N. Chokani  and
L. C. Squire
N. Chokani
Affiliation:
Department of Engineering, University of Cambridge
L. C. Squire
Affiliation:
Department of Engineering, University of Cambridge
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Abstract

Transonic shockwave/turbulent boundary layer interactions on a porous surface above a closed plenum chamber have been studied experimentally in the choked flow of a windtunnel test-section. The equivalent freestream Mach number is 0.76 and results were obtained for three shock strengths. Without the porous surface the Mach numbers ahead of the shock were 1.13, 1.18 and 1.26. The respective shock Mach numbers with the porous surface were 1.10, 1.11 and 1.19. Laser holographic interferometry results are used to measure the density flowfield and examine the nature of the interaction. These results show that the interaction on the porous surface is modified by a thin shear layer adjacent to the surface and the weakening of the Shockwave is attributed to this. The interaction was also studied by solving the two-dimensional Reynolds-averaged Navier-Stokes equations together with the two-layer algebraic eddy-viscosity model of Baldwin-Lomax modified with appropriate corrections for surface transpiration. The computed results show excellent agreement with the experimental data. The examination of these numerical results shows that the surface transpiration occurs at a low subsonic velocity and suggests that the effect of the transpiration through the porous surface on the interaction may be optimised.

Type
Research Article
Information
The Aeronautical Journal , Volume 97 , Issue 965 , May 1993 , pp. 163 - 170
Copyright
Copyright © Royal Aeronautical Society 1993 

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Footnotes

*

Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, USA.

References

1. Krogmann, P., Stanewsky, E. and Thiede, P. Transonic shock-boundary layer interaction control, ICAS Paper 84–2.3.2. 14th International Congress of Aeronautical Sciences, Toulouse. 1984.Google Scholar
2. Thiede, P., Krogmann, P. and Stanewsky, E. Active and passive shock/Boundary layer interaction control on supercritical aerofoils, AGARD CP-365, Paper 24. 1984.Google Scholar
3. Krogmann, P., Thiede, P. and Stanewsky, E. Effects of suction on shock/Boundary layer interaction and shock-induced separation, J Aircr, 1985, 22, (1), pp 37–42.Google Scholar
4. Thiede, P. and Krogmann, P. Passive control of transonic shock/Boundary-layer interaction, In: IUTAM Symposium Transsonicum III, Oertel, H. and Zierep, J. (eds), Göttingen. 1988.Google Scholar
5. Bahi, L., Ross, J.M. and Nagamatsu, H.T. Passive shock wave/ Boundary layer control for transonic airfoil drag reduction, AIAA Paper 83–0137, 1983.Google Scholar
6. Raghunathan, S. Passive control of shock/boundary-layer interaction, Prog Aerospa Sci, 1988, 25, pp 271–296.Google Scholar
7. Dawes, W.N. Efficient implicit algorithm for the equations of 2-D viscous compressible flows: application to shock-boundary layer interaction, Int J Heat Fluid Flow, 1982, 4, pp 17–26.Google Scholar
8. Chokani, N. A study of the passive effect on transonic shockwave-turbulent boundary layer interactions on porous surfaces, PhD Thesis, Department of Engineering, Cambridge University. 1988.Google Scholar
9. Vest, C.M. Holographic Interferometry, J. Wiley & Sons, New York, 1979.Google Scholar
10. Alber, I.E., Bacon, J.W., Masson, B.S. and Collins, D.J. An Experimental investigation of turbulent viscous-inviscid interactions. AIAA J, 1981,11, (5), pp 620–627.Google Scholar
11. Liu, X. and Squire, L.C. An investigation of shock/boundary layer interaction on curved surfaces at transonic speeds, J Fluid Mech, 1988,187, pp 467–486.Google Scholar
12. Baldwin, B.S. and Lomax, H. Thin layer approximation and algebraic model for separated turbulent flows, AIAA paper 78–257, 1978.Google Scholar
13. Cebeci, T. Behaviour of turbulent flow near a porous wall with pressure gradient, AIAA J, 1978, 8, pp 2152–2156.Google Scholar
14. Squire, L.C. and Verma, V.K. The calculation of compressible turbulent boundary layers with fluid injection, British ARC Current Paper 1265, 1973.Google Scholar
15. Chokani, N. and Squire, L.C. Passive control of shock/boundary-layer interactions: numerical and experimental studies. In: IUTAM Symposium Transsonicum III, Oertel, H., Zierep, J. (eds), Göttingen, pp 399–406, 1988.Google Scholar