TY - JOUR
T1 - TURBULENCE SUPPRESSION IN FREE SHEAR FLOWS BY CONTROLLED EXCITATION.
AU - Zaman, K. B.M.Q.
AU - Hussain, A. K.M.F.
N1 - Copyright:
Copyright 2004 Elsevier B.V., All rights reserved.
PY - 1980
Y1 - 1980
N2 - 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.
AB - 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.
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M3 - Conference article
AN - SCOPUS:0019244771
JO - AIAA Paper
JF - AIAA Paper
SN - 0146-3705
T2 - AIAA Pap AIAA Fluid & Plasma Dyn Conf, 13th
Y2 - 14 July 1980 through 16 July 1980
ER -