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

M. F.A.K. Hussain, Z. M.A. Hasan

Research output: Contribution to journalArticle

37 Scopus citations

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 < St0 < 0.02, where Std 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.

Original languageEnglish
Pages (from-to)159-168
Number of pages10
JournalJournal of Fluid Mechanics
Volume150
DOIs
StatePublished - Jan 1985

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