Hostname: page-component-78c5997874-8bhkd Total loading time: 0 Render date: 2024-11-11T09:23:42.076Z Has data issue: false hasContentIssue false
  • English
  • Français

Pipe jet noise reduction using co-axial swirl pipe

Part of: Sustainable Aerospace

Published online by Cambridge University Press:  06 March 2017

P. Balakrishnan  and
K. Srinivasan
P. Balakrishnan*
Affiliation:
Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai - 600036, India
K. Srinivasan*
Affiliation:
Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai - 600036, India
*
balaaero50@gmail.com
ksri@iitm.ac.in
Get access Rights & Permissions [Opens in a new window]

Abstract

The present experimental work highlights the acoustic far field and flow field characteristics of confined co-axial swirling pipe jets. Co-axial confinements with six vanes at angles of 0°, 20° and 40° are considered here. Two pipe lengths of L/D=0.5 and 2 are studied. The Mach numbers studied range from 0.85 to 1.83. An increase in the pipe length causes suppression of the transonic tones in non-swirl pipe jets. Swirl reduces the low frequency noise components and increases the high-frequency components compared to non-swirl jet. The broadband shock associated noise is mitigated by the swirl pipe jets. However, the screech tone is completely eliminated by the swirl pipe jets. Further, swirl pipe jets radiate low levels of noise at all the emission angles compared to non-swirl pipe jets, for both the pipe length cases at supersonic Mach numbers. Increase in the pipe length enhances the shock associated noise and OASPL for the non-swirl pipe jet. Centreline pitot survey and schlieren visualisation show a reduction in core length, reduction in the number of shock cells, weakening/destruction of the shock cells by the swirl pipe jets compared to the non-swirl pipe jets.

Keywords

Confined co-axial swirl jetswirling pipe jetswirl flowsjet noise reduction
Type
Research Article
Information
The Aeronautical Journal , Volume 121 , Issue 1238 , April 2017 , pp. 488 - 514
Copyright
Copyright © Royal Aeronautical Society 2017 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Park, S.H. and Shin, H.D. Measurements of entrainment characteristics of swirling jets, Int J Heat and Mass Transfer, 1993, 36, (16), pp 4009–4018.Google Scholar
2. Abdelhafez, A. and Gupta, A.K. Swirl effects on free underexpanded supersonic airflow, In 47th AIAA Aerospace Sciences Meeting and Exhibit, 2009, Orlando, Florida, US, AIAA Paper 2009-1646.Google Scholar
3. Schwartz, I.R. Jet noise suppression by swirling the jet flow, AIAA Paper 73-1002, 1973.Google Scholar
4. Schwartz, I.R. Minimization of jet and core noise of a turbojet engine by swirling the exhaust flow, AIAA Paper 75-503, 1975.Google Scholar
5. Elsner, J.W. and Kurzak, L. Characteristics of turbulent flow in slightly heated free swirling jets, J Fluid Mechanics, 1987, 180, pp 147–169.Google Scholar
6. Ahmadvand, M., Najafi, A.F. and Shahidinejad, S. An experimental study and CFD analysis towards heat transfer and fluid flow characteristics of decaying swirl pipe flow generated by axial vanes, Meccanica, 2010, 45, (1), pp 111–129.Google Scholar
7. Eiamsa-Ard, S. and Promvonge, P. Enhancement of heat transfer in a tube with regularly-spaced helical tape swirl generators, Solar Energy, 2005, 78, (4), pp 483–494.Google Scholar
8. Iselk, A.A. The impact of Swirl in Turbulent Pipe flow, MS Thesis, 2004, Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia, US.Google Scholar
9. Ariyaratne, C. Design and Optimization of Swirl Pipes and Transition Geometries for Slurry Transport, Ph.D Thesis, 2005, University of Nottingham, UK.Google Scholar
10. Dhir, V.K. Heat transfer enhancement using tangential injection, The Regents of The University of California, U.S. Patent 5291943, 1994.Google Scholar
11. Alekseenko, S.V., Dulin, V.M., Kozorezov, Y.S. and Markovich, D.M. Effect of axisymmetric forcing on the structure of a swirling turbulent jet, Int J Heat and Fluid Flow, 2008, 29, (6), pp 1699–1715.Google Scholar
12. Dinesh, K.R., Savill, A.M., Jenkins, K.W. and Kirkpatrick, M.P. A study of mixing and intermittency in a coaxial turbulent jet, Fluid Dynamics Research, 2009, 42, (2), p 025507.Google Scholar
13. Ribeiro, M.M. and Whitelaw, J.H. Coaxial jets with and without swirl, J Fluid Mechanics, 1980, 96, (04), pp 769–795.CrossRefGoogle Scholar
14. Tam, C.K.W., Golebiowski, M. and Seiner, J.M. On the two components of turbulent mixing noise from supersonic jets, AIAA Paper 96-1716, 1996.CrossRefGoogle Scholar
15. Zaman, K.B.M.Q., Dahl, M.D., Bencic, T.J. and Loh, C.Y. Investigation of a ‘transonic resonance’ with convergent–divergent nozzles, J Fluid Mechanics, 2002, 463, pp 313–343.Google Scholar
16. Jothi, T.J.S. and Srinivasan, K. Transonic resonance tones in orifice and pipe jets, Int J Aeroacoustics, 2013, 12, (1–2), pp 103–121.Google Scholar
17. Lu, H.Y., Ramsay, J.W. and Miller, D.L. Noise of swirling exhaust jets, AIAA J, 1977, 15, (5), pp 642–646.Google Scholar
18. Yu, Y.K. and Chen, R.H. A study of screech tone noise of supersonic swirling jets, J Sound Vibration, 1997, 205, (5), pp 698–705.Google Scholar
19. Andersson, N., Eriksson, L.E. and Davidson, L. LES prediction of flow and acoustic field of a coaxial jet, AIAA Paper, 2884, 2005.Google Scholar
20. Rostamimonjezi, S. Noise Source Distribution and Mean-Flow Structure of Coaxial Jets, MS Thesis in Mechanical and Aerospace Engineering, 2010, University of California, Irvine, California, US.Google Scholar
21. Dhamanekar, A. and Srinivasan, K. Effect of impingement surface roughness on the noise from impinging jets, Physics of Fluids, 2014, 26, (3), p 036101.Google Scholar
22. Gao, J.H. and Li, X.D. A multi-mode screech frequency prediction formula for circular supersonic jets, J Acoustical Soc America, 2010, 127, (3), pp 1251–1257.Google Scholar
23. Shin, S., Matsunaga, A., Marubayashi, H. and AOKI, T. Effects of nozzle-lip length on reduction of transonic resonance in 2D supersonic nozzle, Open J Fluid Dynamics, 2013, 3, (02), p 69.Google Scholar
24. Yu, Y.K., Chen, R.H. and Chew, L. Screech tone noise elimination and mode switching in supersonic swirling jets, AIAA J, 1998, 36, (11), pp 1968–1974.Google Scholar
25. Phanindra, B., Chiranjeevi, and Rathakrishnan, E. Corrugated tabs for supersonic jet control, AIAA J, 2010, 48, (2), pp 453–465.Google Scholar
26. Rathakrishnan, E. Applied Gas Dynamics, 2010, John Wiley & Sons (Asia) Pte Ltd, Singapore.Google Scholar
27. Baek, S.C., Kwon, S.B. and Lee, B.E. An experimental study of supersonic dual coaxial free jet. KSME Int J, 2003, 17, (12), pp 2107–2115.Google Scholar