Controlled perturbation of circular jets

  • A. K. M. F. Hussain
  • K. B. M. Q. Zaman
Conference paper
Part of the Lecture Notes in Physics book series (LNP, volume 75)


The near flow fields of periodically perturbed circular air jets have been experimentally investigated for the Strouhal number range 0 ≤ StD ≤ 4.0 and the Reynolds number range 11,000–113,000. The largest total fluctuation intensity growth on the centerline occurs at StD ≌ 0.85 while the largest fundamental amplitude growth occurs at StD ≌ 0.30. At StD ≌ 0.85, most of the fluctuations is at the subharmonic frequency associated with vortex pairing in the ‘jet mode’, which is independent of the ‘shear layer mode’ of vortex pairing occurring at Ste ≌ 0.011. Smoke visualization at lower speeds provided further details of pairing in either mode. In the jet mode of vortex pairing, the Reynolds stress undergoes large excursions even though its time average values are not altered appreciably by the excitation.


Shear Layer Reynolds Stress Strouhal Number Vortex Pairing Settling Chamber 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Brown, G. L. and Roshko, A.: J. Fluid Mech. 64 (1974) 775–816.Google Scholar
  2. 2.
    Winant, C. D. and Browand, F. K.: J. Fluid Mech. 63 (1974) 237–255.Google Scholar
  3. 3.
    Browand, F. K. and Laufer, J.: Turbulence in Liquids 4 (1975) 333–344.Google Scholar
  4. 4.
    Hussain, A. K. M. F. and Zaman, K. B. M. Q.: Proc. 3rd Interag. Symp. Trans. Noise, U. of Utah, (1975) 314–326.Google Scholar
  5. 5.
    Zaman, K. B. M. Q. and Hussain, A. K. M. F.: Proc. Turb. Shear Flow, Penn. State U., April, 1977, 11:23–11:31.Google Scholar
  6. 6.
    Crow, S. C., and Champagne, F. H.: J. Fluid Mech. 48 (1971) 547–591.Google Scholar

Copyright information

© Springer-Verlag 1978

Authors and Affiliations

  • A. K. M. F. Hussain
    • 1
  • K. B. M. Q. Zaman
    • 1
  1. 1.University of HoustonTexas

Personalised recommendations