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Effect of cut-outs on underexpanded rectangular jets

Published online by Cambridge University Press:  04 July 2016

S. Elangovan  and
E. Rathakrishnan
S. Elangovan
Affiliation:
Department of Mechanical Engineering, Gurunanak Dev Engineering College, Bidar, Karnataka, India
E. Rathakrishnan
Affiliation:
Department of Aerospace Engineering, Indian Institute of Technology, Kanpur, India
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Abstract

The flowfield characteristics of jets from plain and rectangular orifices with semi-circular cut-outs have been experimentally investigated for both sonic and underexpanded conditions. Detailed pitot pressure measurements revealed that the cut-outs had a strong influence on the emerging flowfield. The rectangular orifice with cut-outs at the minor axis ends showed more effective mixing with shorter core lengths and faster near field jet decay when compared with the plain rectangular and the rectangular orifice with cut-outs at the major axis ends. The general trend of variation of shock cell length with fully expanded Mach number was consistent with Tam's theory, but the shock cell length of orifice jets were less than that predicted by Tam.

Type
Research Article
Information
The Aeronautical Journal , Volume 102 , Issue 1015 , May 1998 , pp. 267 - 276
Copyright
Copyright © Royal Aeronautical Society 1998 

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References

1. Morris, P.J., Bhat, T.R.S. and Chen, G. A linear shock cell model for jets of arbitrary exit geometry, J Sound and Vibration, 1989, 132, pp 199–211.Google Scholar
2. Quinn, W.R. and Marsters, G.F. Upstream influence on turbulent jet flows from cruciform nozzles, Aeronaut J, Feb 1985, 89, (882), pp 55–58.Google Scholar
3. Pannu, S.S. and Johannesen, N.H. The structure of jets from notched nozzles, J Fluid Mech, 1976, 74, pp 515–528.Google Scholar
4. Wlezien, R.W. and Kibens, V. Influence of nozzle asymmetry on supersonic jets, AIAA J, 1988, 26, pp 27–33.Google Scholar
5. Krothapalli, A., Baganoff, D. and Karamcheti, K. On the mixing of a rectangular jet. J Fluid Mech, 1981,107, pp 201–220.Google Scholar
6. Husain, H.S. and Hussain, A.K.M.F. Controlled excitation of elliptic jet, Physics of Fluids, 1983,26, pp 2763–2765.Google Scholar
7. Gutmark, E. and Ho, CM. Near field pressure fluctuations of an elliptic jet, AIAA J, 1985, 23, pp 354–358.Google Scholar
8. Gutmark, E. and Ho, CM. Visualization of a forced elliptic jet, AIAA J, 1985,24, pp 684–685.Google Scholar
9. Quinn, W.R. On mixing in an elliptic turbulent free jet, Physics of Fluids, 1983, 26, pp 1716–1722.Google Scholar
10. Trentacoste, N. and Sforza, P.M. Further experimental results for three-dimensional free jets, AIAA J, 1967,5, pp 885–891.Google Scholar
11. Gutmark, E. and Schadow, K.C, Flow characteristics of orifice and tapered jets, Physics of Fluids, 1987, 30, pp 885–891.Google Scholar
12. Sforza, P.M., Steiger, M.H. and Trentacoste, N. Studies on three- dimensional viscous jets,AIAA J, 1966,98, pp 800–806.Google Scholar
13. Narain, J.P. Momentum flux development from three-dimensional free jets, Trans ASME, J Fluid Eng, 1976, 98, pp 256–260.Google Scholar
14. Krothapalli, A., Hsia, Y., Baganoff, D. and Karamcheti, K. The roll of screech tones in mixing of an underexpanded rectangular jet,J Sound and Vibration, 1986,106, pp 119–143.Google Scholar
15. Gutmark, E., Schadow, K.C. and Bicker, C.J. Near acoustic field and shock structure of rectangular supersonic jets, AIAA J, 1990, 28, pp 1163–1170.Google Scholar
16. Shih, C, Krothapalli, A. and Gogineni, S. Experimental observations of instability modes in a rectangular jet, AIAA J, 1991, 30, pp 2388–2394.Google Scholar
17. Rice, E.J. and Raman, G. Supersonic jets from beveled rectangular nozzles, ASME Paper 93-WA/NCA-26, 1993.Google Scholar
18. Raman, G. and Rice, E.J. Instability modes excited by natural screech tones in a supersonic rectangular jet, Physics of Fluids, 1994, 6, pp 3999–4008.Google Scholar
19. Raman, G. Screech tones from rectangular jets with spanwise oblique shock-cell structure. Paper No AIAA-96-0643, 34th Aerospace Science Meeting and Exhibit, Reno, NV, January 1996.Google Scholar
20. Tam, C.K.W. The shock-cell structures and screech tone frequencies of rectangular and non-axisymmetric supersonic jets, J Sound and Vibration, 1988, 121, pp 135–147.Google Scholar
21. Raman, G. and Rice, E.J. Instability modes excited by natural screech tones in a supersonic rectangular jet, AIAA paper 93 4321, 1993.Google Scholar
22. Hussain, F. and Husain, H.S. Elliptic jets. Part 1, Characteristics of unexcited and excited jets, J Fluid Mech, 1989, 208, pp 257–320.Google Scholar
23. Hussain, A.K.M.F. and Ramjee, V. Effects of the axisymmetric contraction shape on incompressible turbulent flow. Trans ASME, J Fluid Eng, 1976, 98, pp 58–69.Google Scholar
24. Schadow, K.C., Gutmark, E., Koshigoe, S. and Wilson, K.J. Combustion related shear flow dynamics in elliptic supersonic jets, AIAA J, 1989, 27, pp 1347–1353.Google Scholar
25. Raman, G. and Rice, E.J. Mixing and noise benefit versus thrust penalty in supersonic jets using impingement tones, AIAA Paper 94-2955, 1994.Google Scholar
26. Nagai, M. Mechanism of pseudo-shock wave in supersonic jet, Bulletin of the JSME, 1983, 26, pp 207–214.Google Scholar
27. Batchelor, G.K. An Introduction of Fluid Mechanics, Cambridge University Press, England, 1967.Google Scholar
28. Tsuchiya, Y., Horikoshi, C. and Sato, T. On the spread of rectangular jets, Exp in Fluids, 1986, 4, pp 197–204.Google Scholar
29. Tam, C.K.W., Jackson, J.A. and Seiner, J.M. A multiple scale model of the shock cell structure of imperfectly expanded sonic jets, J Fluid Mech, 1985, 153, pp 123–149.Google Scholar
30. Powell, A. On the noise emanating from a two-dimensional jet above the critical pressure, Aeronaut Q, February 1953, 4, pp 103–122.Google Scholar