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Supersonic flow over three dimensional cavities

Published online by Cambridge University Press:  27 January 2016

R. Das  and
J. Kurian
J. Kurian*
Affiliation:
Indian Institute of Technology, Madras, Chennai, India
*
kurian@iitm.ac.in
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Abstract

This work presents a study of acoustic oscillations generated and the wave structure associated with supersonic flow past wall mounted 3D open cavities of varying length-to-width (L/W) ratio. Experiments were conducted to investigate the acoustic signature generated by the cavities at freestream Mach number of 1·7. The effect of L/W ratio of the cavity on the dominant modes of the acoustic signature registered on different walls of the cavities is investigated for an L/W range of 0·83-4. Shift in the dominant acoustic mode is observed as L/W ratio changes from 3 to 4. Statistical analysis of pressure data showed existence of acoustic waves and spreading of acoustic energy over different modes with change in cavity width. Time averaged schlieren visualisation indicated variation of shock and shear layer structure in the mainstream for the different cavities. Acoustic waves generated by the presence of the cavity and the dynamic behaviour of the shear layer were observed during instantaneous shadowgraph visualisation. Numerical simulation was done to make a prior assessment of the flow structure and the results are in good agreement with those from experiments. Ratio of mass exchange between cavity and mainflow and the cavity volume was observed to have profound effect on the magnitude of pressure oscillations generated by the cavities.

Type
Research Article
Information
The Aeronautical Journal , Volume 117 , Issue 1188 , February 2013 , pp. 175 - 192
Copyright
Copyright © Royal Aeronautical Society 2013 

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References

1. Krishnamurthy, K. Acoustic radiation from two-dimensional rectangular cutouts in aerodynamic surface, 1955, NASA-TN-3487.Google Scholar
2. Rossiter, J.E. Wind tunnel experiments on the flow over rectangular cavities at subsonic and transonic speeds, reports and memoranda No 3438, 1964, Aeronautical Research Council, pp 1–36.Google Scholar
3. Heller, H.H, Holmes, D.G and Covert, E.E. Flow induced pressure oscillations in shallow cavities, J Sound and Vibration, 1971, 18, (4), pp 545–553.Google Scholar
4. Bilanin, A.J. and Covert, E.E. Estimation of possible excitation frequencies for shallow rectangular cavities, AIAA J, 1973, 11, (3).Google Scholar
5. Yu, K.H. and Schadow, K.C. Cavity Actuated supersonic mixing and combustion control, J Combustion and Flame, 1994, 99, pp 295–301.Google Scholar
6. Yakar, A.B. and Hanson, R.K. Cavity flame holders for ignition and and flame stabilization in scramjets: an overview, J Propulsion and Power, 1998, 17, (4), pp 869–877.Google Scholar
7. Rockwell, D. and Naudascher, E. Review — self sustaining oscillations of flow past cavities, J Fluids Eng, June 1978, 100, (6), pp 152–165.Google Scholar
8. Tam, C.K.W. and Block, P.J.W. On the tones and pressure oscillations induced by flow over rectangular cavities, 1978, J Fluids Eng, 89, Part 2.Google Scholar
9. Heller, H. and Delfs, J. Cavity Pressure oscillations: the generating mechanism visualized. J Sound and Vibration, 1996, 196, (2), pp 248–252.Google Scholar
10. Block, P.J.W. Noise response of cavities of varying dimensions at subsonic speeds, 1976, NASA TN D 8351.Google Scholar
11. Maull, D.J. and East, L.F. Three dimensional flow in cavities, J Fluid Mech, 1963, 16, pp 620–632.Google Scholar
12. Sheih, C.M. and Morris, P.J. Comparison of two and three dimensional turbulent cavity flows, January 2001, AIAA 2001-0511.Google Scholar
13. Soemarwoto, B.I. and Kok, J.C. Computations of three-dimensional unsteadysupersonic cavity flow to study the effect of downstream geometries, November 2001, NLR-TP-2001-446.Google Scholar
14. Zhuang, N., Alvi, F.S., Alkislar, M.B. and Sheih, C. Supersonic cavity flows ad their controls, AIAA J, 2006, 44, ()9, pp 2118–2156.Google Scholar
15. Choi, H., Mun, P. and Kim, J. Numerical analysis of subsonic flow around a three dimensional cavity, J Mech. Science and Tech, 2009, 23, pp 1702–1709.Google Scholar
16. Woo, C., Kim, J. and Lee, K. Three dimensional effects of supersonic cavity flow due to the variation of cavity aspect and width ratios, J Mech. Science and Tech, 2008, 22, pp 590–598.Google Scholar
17. Gruber, M.R, Braule, R.A., Mathur, T. and Hsu, K.Y. Fundamental studies of cavity based fameholder concepts for supersonic combustors, July 1999, AIAA Paper 99-2248.Google Scholar
18. Zhang, X. and Edward, J.A. An investigation of supersonic oscillatory cavity flows driven by thick shear layers, Aeronaut J, 1990, pp 355–364.Google Scholar
19. Rowley, C.W., Colonius, T. and Basu, A.J. On self sustained oscillations in two-dimensional compressible flow over rectangular cavities, J Fluid Mech, 2002, 455, pp 315–346.Google Scholar
20. Handa, T. and Masuda, M. On the jump in the frequency of acoustic oscillations in supersonic flows over rectangular cavity, Physics of Fluids, February, 2009, 21, 026102, pp 1–7.Google Scholar
21 Zhang, X. Compressible cavity flow oscillation due to shear layer instabilities and pressure feedback, AIAA Journal, 1995, 33, (8), pp 1404–1411.Google Scholar
22. Sharma, M., Rishikesh, V., Shet, U.S.P. and Sundararajan, T. Enhancement of fuel air mixing in supersonic flow by wall mounted opposed cavity, Proceedings of ISABE-2005-1112, pp 1–9.Google Scholar