TURBULENCE SUPPRESSION IN FREE SHEAR FLOWS BY CONTROLLED EXCITATION.

K. B.M.Q. Zaman, A. K.M.F. Hussain

Research output: Contribution to journalConference article

5 Scopus citations

Abstract

In an attempt to explain the mechanics of turbulence suppression observed earlier under controlled excitation, the near-fields of four circular jets, a plane jet and a plane mixing layer - all with laminar efflux boundary layers - have been explored through hot-wire measurements. It is shown that controlled excitation - induced acoustically as well as by vibrating ribbons - can reduce turbulence intensities in all these flows. Reduction by as much as 80% is observed, the maximum decrease occurring at about 400 theta //e downstream from the exit; theta //e is the initial shear layer moment thickness. The suppression effect is maximum for excitation at the Strouhal number of about 0. 017.

Original languageEnglish
JournalAIAA Paper
StatePublished - 1980
EventAIAA Pap AIAA Fluid & Plasma Dyn Conf, 13th - Snowmass, CO, USA
Duration: Jul 14 1980Jul 16 1980

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