Accession Number : ADA191470
Title : Noise Generation and Boundary Layer Effects in Vortex-Airfoil Interaction and Methods of Digital Hologram Analysis for these Flow Fields.
Descriptive Note : Interim periodic rept. no. 1, 11 Sep-28 Nov 87,
Corporate Author : MAX-PLANCK-INST FUER STROEMUNGSFORSCHUNG GOETTINGEN (GERMANY F R)
Personal Author(s) : Meier, G E
PDF Url : ADA191470
Report Date : 30 Nov 1987
Pagination or Media Count : 6
Abstract : The mechanism of sound generation and the kind of viscid interaction of vortices with airfoils in an airflow is investigated. Experiments have been performed in regular, quasi-stationary flow with vortices of a Karman vortex street. Depending on the dimensions of vortices and airfoils, their distance, and the flow Machnumbers, different kinds of upstream propagating sound waves occur. Keywords: Noise, Boundary layer, Vortex airfoil interaction, Secondary vortex, Vortex noise, Digital interferogram analysis, Fringe evaluation, Image processing.
Descriptors : *AIRFOILS, *VORTICES, *FLOW NOISE, *BOUNDARY LAYER FLOW, *FLOW VISUALIZATION, *HOLOGRAMS, AIR FLOW, BOUNDARY LAYER, DIGITAL SYSTEMS, FLOW FIELDS, HOLOGRAMS, IMAGE PROCESSING, INTERACTIONS, INTERFEROGRAMS, NOISE GENERATORS, SECONDARY, SOUND WAVES, SYSTEMS ANALYSIS, TEST AND EVALUATION, VISCOUS FLOW, WAVE PROPAGATION
Subject Categories : Fluid Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE