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
      Acoustics
      Holography

Distribution Statement : APPROVED FOR PUBLIC RELEASE