Accession Number : ADA186355

Title :   On the Pairing Process in an Excited, Plane, Turbulent Mixing Layer.

Descriptive Note : Final Technical rept. 15 Aug 85-15 Aug 86,

Corporate Author : TEL-AVIV UNIV (ISRAEL) SCHOOL OF ENGINEERING

Personal Author(s) : Wygnanski, I ; Weisbrot, I

PDF Url : ADA186355

Report Date : Aug 1987

Pagination or Media Count : 16

Abstract : The flowfield of a plane, turbulent mixing layer disturbed by a small oscillating flap was investigated. Three experiments were carried out: one in which the flap oscillated sinusoidally at a single frequency, a second in which the flap oscillation at two frequencies, a fundamental and a subharmonic; and a third in which the amplitude of the subharmonic perturbation was increased until a distortion in the mean flow was detected. Two velocity components were measured at all phase angels intervals. The data were used to map vorticity fields and the streak-line patterns for the purpose of assessing the relevance of the latter to the understanding of the dynamical processes involved. Keywords: Vortex pairing. (Israel)

Descriptors :   *FLAPS(CONTROL SURFACES), *TURBULENT FLOW, DISTORTION, DYNAMICS, VORTICES, FLOW FIELDS, HARMONICS, ISRAEL, LAYERS, MEAN, MIXING, OSCILLATION, PERTURBATIONS, TURBULENT FLOW

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE