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Control of a supersonic elliptical jet

Published online by Cambridge University Press:  08 November 2017

A. Bajpai  and
E. Rathakrishnan
A. Bajpai
Affiliation:
Indian Institute of Technology, Kanpur, India
E. Rathakrishnan*
Affiliation:
Indian Institute of Technology, Kanpur, India
*
[email protected]
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Abstract

Mach 2 jet from a convergent-divergent elliptical nozzle, of aspect ratio 2, has been controlled with limiting flat and arc tabs. The mixing promoting capability of the flat and arc tabs were studied in the presence of different levels of pressure gradient, at the nozzle exit, corresponding to nozzle pressure ratios of 4 to 8, in steps of one. The geometrical blockage of both the tabs is 5% of nozzle exit area. For the flat tab along the minor axis, the waves in the core become weaker and the core length becomes shorter than the uncontrolled jet, at all the NPRs studied. But the flat tab along the major axis promotes mixing only for some NPRs and retards the mixing for the rest of the NPRs studied. At NPR 5, the flat tab along the minor axis causes the largest core length reduction of 86%. For circular arc tab, along the minor axis, the maximum core length reduction is 55% at NPR 6. Arc tab along the major axis protects the core length for the entire range of the nozzle pressure ratios tested and maximum extension in core length is found at NPR 4, which is 40%.

Keywords

JetSupersonicElliptic NozzleLimiting Tab
Type
Research Article
Information
The Aeronautical Journal , Volume 122 , Issue 1247 , January 2018 , pp. 131 - 147
Copyright
Copyright © Royal Aeronautical Society 2017 

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References

REFERENCES

1. Husain, H.S. and Hussain, A.K.M.F. Controlled excitation of elliptical jets, Physics of Fluids, 1983, 26, pp 2763–2766.CrossRefGoogle Scholar
2. Ho, C.M. and Gutmark, E.J. Vortex induction and mass entrainment in a small-aspect ratio elliptical jet, J. Fluid Mechanics, 1987, 179, pp 383–405.CrossRefGoogle Scholar
3. Gutmark, E.J., Schadow, K.C. and Wilson, K.J. Noncircular jet dynamics in supersonic combustion, J. Propulsion and Power, 1989, 5, pp 529–533.CrossRefGoogle Scholar
4. Gutmark, E.J., Schadow, K.C. and Wilson, K.J. Subsonic and supersonic combustion using noncircular injectors, J. Propulsion and Power, 1991, 7, pp 240–249.CrossRefGoogle Scholar
5. Bradbury, L.J.S. and Khadem, A.H. The distortion of a jet by tabs, J. Fluid Mechanics, 1995, 70, (4), pp 801–813.CrossRefGoogle Scholar
6. Samimy, M., Zaman, K.B.M.Q. and Reeder, M. F. Effect of tabs on the flow and noise field of an axisymmetric jet, AIAA, 1993, 31, pp 609–619.CrossRefGoogle Scholar
7. Rathakrishnan, E. Experimental studies on the limiting tab, AIAA, 2009, 47, pp 2475–2485.CrossRefGoogle Scholar
8. Arun Kumar, P. and Rathakrishnan, E. Corrugated triangular tabs for supersonic jet control, Proceedings of the Institution of Mech. Engineers, Part G: J. Aerospace Engineering, 2014, 228, pp 831–845.CrossRefGoogle Scholar
9. Ahuja, K.K. Mixing enhancement and jet noise reduction through tabs plus ejectors, AIAA Paper No. 93-4347, 25-27 October 1993, Monterey, CA.CrossRefGoogle Scholar
10. Arun Kumar, P. and Rathakrishnan, E. Triangular tabs for supersonic jet mixing enhancement, The Aeronautical J, 2014, 118, (1209), pp 1245–1278.Google Scholar
11. Bohl, D. and Foss, J.F. Characteristic of the velocity and streamwise vorticity fields in a developing tabbed jet, AIAA Paper No. 95-0102, 9-12 January 1995.CrossRefGoogle Scholar
12. Ahuja, K.K. and Brown, W.H. Shear flow control by mechanical tabs, AIAA Paper No. 89-0994, 1989.CrossRefGoogle Scholar
13. Aravindh Kumar, S.M. and Rathakrishnan, E. Characteristics of a supersonic elliptical jet, The Aeronautical J, 2016, 120, pp 495–519.CrossRefGoogle Scholar
14. Rathakrishnan, E. Applied Gas Dynamics, 2010, Wiley, Hoboken, New Jersey, US.Google Scholar
15. Aravindh Kumar, S.M. and Rathakrishnan, E. Characteristics of controlled Mach 2 elliptical jet, J Propulsion and Power, 2015, 32, pp 121–133.CrossRefGoogle Scholar
16. Rathakrishnan, E. Instrumentation, Measurements and Experiments in Fluids, 2nd ed., 2017, CRC Press, Boca Raton, Florida, US.Google Scholar