Hostname: page-component-848d4c4894-x5gtn Total loading time: 0 Render date: 2024-05-07T21:14:32.638Z Has data issue: false hasContentIssue false
  • English
  • Français

Turbulence suppression in free turbulent shear flows under controlled excitation. Part 2. Jet-noise reduction

Published online by Cambridge University Press:  20 April 2006

A. K. M. F. Hussain  and
M. A. Z. Hasan
A. K. M. F. Hussain
Affiliation:
Department of Mechanical Engineering, University of Houston, Texas
M. A. Z. Hasan
Affiliation:
Department of Mechanical Engineering, University of Houston, Texas Present address: Department of Mechanical Engineering, The Catholic University of America, Washington, D.C. 20064.
Get access Rights & Permissions [Opens in a new window]

Abstract

It is shown that reduction of broadband (even total) far-field jet noise can be achieved via controlled excitation of a jet at a frequency in the range 0.01 < Stθ < 0.02, where Stθ is the Strouhal number based on the exit momentum thickness of the shear layer. Hot-wire measurements in the noise-producing region of the jet reveal that the noise suppression is a direct consequence of turbulence suppression, produced by early saturation and breakdown of maximally growing instability modes.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 150 , January 1985 , pp. 159 - 168
Copyright
© 1985 Cambridge University Press

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

Ahuja K. K.1972 M. Phil. thesis, London University.
Bechert, D. & Pfizenmaier E.1975 J. Sound Vib. 43, 581.
Crighton D. G.1975 Prog. Aero. Sci. 16, 31.
Crighton D. G. 1981a In The Role of Goherent Structures in Modelling Turbulence and Mixing (ed. J. Jimenez). Lecture Notes in Physics, vol. 136, p. 340. Springer.
Crighton D. G.1981b J. Fluid Mech. 106, 261.
Crighton, D. G. & Gaster M.1976 J. Fluid Mech. 77, 397.
Crow S. C.1972 Acoustic gain of a turbulent jet. (Private communication.)
Crow, S. C. & Champagne F. H.1971 J. Fluid Mech. 48, 547.
Ffowcs Williams J. E.1963 Phil. Trans. R. Soc. Lond. A 225, 469
Ffowcs Williams, J. E. & Kempton, A. J. 1978 J. Fluid Mech. 84, 673.
Freymuth P.1966 J. Fluid Mech. 25, 683.
Goldstein M. E.1976 Aeroacoustics. McGraw-Hill.
Hasan M. A. Z.1983 Ph.D. thesis, University of Houston.
Hussain A. K. M. F.1983 Phys. Fluids 26, 2816.
Hussain, A. K. M. F. & Zaman K. B. M. Q.1975 In Proc. 3rd Interagency Symp. on University Research and Transportation Noise, University of Utah, p. 314.
Hussain, A. K. M. F. & Zaman K. B. M. Q.1978 J. Fluid Mech. 87, 349.
Hussain, A. K. M. F. & Zaman K. B. M. Q.1981 J. Fluid Mech. 110, 39.
Kibens V.1980 AIAA J. 18, 434.
Laufer J.1973 Bull. Am. Phys. Soc. 18, 1478.
Lighthill M. J.1952 Proc. R. Soc. Lond. A 211, 364.
Lush P. A.1971 J. Fluid Mech. 46, 477.
Michalke A.1965 J. Fluid Mech. 23, 521.
Moore C. J.1977 J. Fluid Mech. 80, 321.
Petersen R. A., Kaplan, R. E. & Laufer J.1974 NASA Contr. Rep. 134733.
Pfizenmaier E.1973 Doctor-Ingenieur thesis, Technische Universität Berlin.
Rockwell, D. O. & Schachenmann A.1982 J. Fluid Mech. 117, 425.
Vlasov, Y. V. & Ginevskiy A. S.1974 NASA TTF-15, 721.
Zaman, K. B. M. Q. & Hussain A. K. M. F.1981 J. Fluid Mech. 103, 133.