Effect of Perforated Tabs on the Noise Field of an Axisymmetric Jet

Abstract:

Effect of triangular tabs with circular perforations on the acoustic far-field of an axisymmetric jet issued from a convergent nozzle of exit diameter of 30.16 mm was studied for both subsonic and sonic underexpanded cases. It was found that the noise in the low frequency range (Strouhal number < 0.29) reduced in both subsonic and supersonic jet mach numbers with a penalty in high frequency noise. OASPL plots showed that overall noise levels in subsonic jets increased due to the introduction of tabs except for far downstream angles where the noise levels reduced by 2 dB. Overall noise levels in underexpanded jets decreased in all directions and at all jet mach numbers without the penalty of high frequency noise. Comparison between tabs without perforation and perforated tabs showed that both the tabs were equally effective.

• Periodical: Applied Mechanics and Materials (Volume 307)
• Pages: 250-256
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.307.250
• Online since: February 2013
• Authors: G. Fayaaz Hussain, Afthab Shaban Nasser, Mohammad Mohiudeen Nawaz, Bikash Kumar Mondal, N. Karthikeyan
• Keywords: Aeroacoustics, Jet Noise, Tabs

References

[1] M. J Lighthill, On sound generated Aerodynamically: I. General Theory, Proceedings of the Royal Society of London, no. A211, pp.564-581, (1952).

[2] M. J Lighthill, On sound generated Aerodynamically: II. Turbulence as a source of sound, Proceedings of the Royal Society of London, no. A222, pp.1-32, (1954).

DOI: 10.1098/rspa.1954.0049

[3] J. E Ffwocs Williams, The noise from turbulence convected at high speed, Philosophical Transactions of the Royal Society A, no. A255, (1963).

[4] L.J. S Bradbury and A. H Khadem, The distortion of a jet by tabs, Journal of Fluid Mechanics, vol. 70, (1975).

[5] M Samimy, K.B.M. Q Zaman, and M. F Reeder, Effect of tabs on the flow and noise field of an axisymmetric jet, AIAA Journal, vol. 31, (1993).

DOI: 10.2514/3.11594

[6] K.B.M. Q Zaman, M. F Reeder, and M Samimy, Control of an axisymmetric jet using vortex generators, Physics of Fluids, vol. 6, (1994).

DOI: 10.1063/1.868316

[7] H Hui, T Kobayashi, S Wu, and G Shen, Changes to the vortical and turbulent structure of jet flows due to mechanical tabs, Proceedings of the Instituition of Mechanical Engineers, vol. 213, pp.321-329, (1999).

DOI: 10.1243/0954406991522284

[8] L. P Chua, S.C. M Yu, and X. K Wang, Flow visualization and measurements of a square jet with mixing tabs, Experimental Thermal and Fluid Science, vol. 27, no. 6, pp.731-744, (2003).

DOI: 10.1016/s0894-1777(02)00312-6

[9] S Clement and E Rathakrishnan, Characteristics of sonic jets with tabs, Shock Waves, vol. 15, pp.219-227, (2006).

DOI: 10.1007/s00193-006-0017-2

[10] P Behrouzi and J. J McGuirk, Effect of tab parameters on near-field jet plume development, Journal of Propulsion and Power, vol. 22, pp.576-585, (2006).

DOI: 10.2514/1.15473

[11] K. K Ahuja, Mixing enhancement and jet noise reduction through tabs plus ejectors, in 15th Aeroacoustics Conference, (1993).

DOI: 10.2514/6.1993-4347