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The effect of trailing edge geometry on cavity flow oscillation driven by a supersonic shear layer

Published online by Cambridge University Press:  04 July 2016

X. Zhang ,
A. Rona  and
J. A. Edwards
X. Zhang
Affiliation:
Department of Aeronautics and AstronauticsUniversity of SouthamptonSouthampton, UK
A. Rona
Affiliation:
Department of Aeronautics and AstronauticsUniversity of SouthamptonSouthampton, UK
J. A. Edwards
Affiliation:
Weapons Systems Sector, Dera Fort Halstead Sevenoaks, UK
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Abstract

A computational analysis is performed of self-sustained oscillatory flow over a cavity driven by a shear layer at Mach 1·5. The unsteady flow is studied through solutions of the Reynolds-averaged Navier-Stokes equations with turbulence modelled by a two-equation k-ω model. The trailing edge (face) of a baseline rectangular cavity is modified using wedge and ramp shapes to investigate means for the suppression and attenuation of the self-sustained oscillation. Through modification of the shear layer impingement, both wedge and ramp are effective in reducing the level of oscillation. The time-averaged pressure (form) drag coefficient of the cavity is also reduced significantly. The main cause of the drag reduction is the elimination or reduction of the high pressure area near the downstream corner of the cavity due to the presence of a vortex. Two types of unsteady flow exist when a curved ramp is employed: ‘regular’ and ‘random’. The use of a h= 0·6D ramp generates a random type pressure fluctuation with lower rms pressure compared with the h= 0·2D and 0·4D ramps.

Type
Research Article
Information
The Aeronautical Journal , Volume 102 , Issue 1013 , March 1998 , pp. 129 - 136
Copyright
Copyright © Royal Aeronautical Society 1998 

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References

1. Krishnamurty, K. Acoustic radiation from two-dimensional rectangular cutouts in aerodynamic surfaces, NACA TN-3487, NACA, August 1955.Google Scholar
2. Rossiter, J.E. Wind tunnel measurements on the flow over rectangular cavities at subsonic and supersonic speeds, Ministry of Aviation, Aeronautical Research Council, London, England, R&M 3438, October 1964.Google Scholar
3. Heller, H.H. and Bliss, D.B. Aerodynamically induced pressure oscillations in cavities — physical mechanism and suppression concepts, AFFDL-TR-74-33, 1974.Google Scholar
4. Charwat, A.F., Roos, J.N., Dewey, F.C. Jr and Hitz, J.A. An investigation of separated flows — part 1: the pressure field, J Aero Sci, June 1961, 28, pp 457–470.Google Scholar
5. Franke, M.E. and Carr, D.L. Effects of geometry on open cavity flow induced pressure oscillation, AIAA paper 75–492, 1975.Google Scholar
6. Ross, J.A., Peto, J.W. and Waskett, M. Aerodynamics effects of weapon bay flowfields on the internal carriage and release of stores, 76th Fluid Dynamics Panel Symposium, AGARD, Ankara, Turkey, 24-27 April 1995.Google Scholar
7. Hankey, W.L. and Shang, J.S. Analysis of pressure oscillation in an open cavity, AIAA J, August 1980, 18, (8), pp 892–898.Google Scholar
8. Rizzetta, D.P. Numerical simulation of supersonic flow over a three-dimensional cavity, AIAA J, July 1988, 26, (7), pp 799–807.Google Scholar
9. Zhang, X. and Edwards, J.A. Computational analysis of unsteady cavity flows driven by thick shear layers, Aeronaut J, November 1988, 92, (919), pp 365–374.Google Scholar
10. Shih, S.H., Hamed, A. and Yeuan, J.J. Unsteady supersonic cavity flow simulations using coupled k-ɛ and Navier-Stokes equations, AIAA J, October 1994, 32, (10), pp 2015–2021.Google Scholar
11. Zhang, X. and Edwards, J.A. An investigation of supersonic oscillatory cavity flows driven by a thick shear layer, Aeronaut J, December 1990, 94, (940), pp 355–364.Google Scholar
12. Zhang, X. and Edwards, J.A. Analysis of unsteady supersonic cavity flow employing an adaptive meshing algorithm, Comp & Fluids, 1996, 25, (4).Google Scholar
13. Wilcox, D.C. Reassessment of the scale determining equation for advanced turbulence models, AIAA J, November 1988, 26, (11), pp 1299–1310.Google Scholar
14. Wilcox, D.C. Dilatation-dissipation corrections for advanced turbulence models, AIAA J, November 1992, 30, (11), pp 2639–2646.Google Scholar
15. Roe, P. Approximate Riemann solvers, parameter vectors and difference schemes, J Comp Phys, October 1981, 43, (2), pp 357–372.Google Scholar
16. Roe, P. Characteristic-based schemes for the Euler equations, Annual Review of Fluid Mechanics, 1986, 18, pp 337–365.Google Scholar
17. Quirk, J.J. An Adaptive Grid Algorithm for Computational Shock Hydrodynamics, PhD Thesis, Cranfield Institute of Technology, January 1991.Google Scholar