Noise Generation and Boundary Layer Effects in Vortex-Airfoil Interaction and Methods of Digital Hologram Analysis for these Flow Fields.

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.

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Document Details

Document Type
Technical Report
Publication Date
Nov 30, 1987
Accession Number
ADA191470

Entities

People

  • G. E. Meier

Tags

Communities of Interest

  • Air Platforms
  • Human Systems

DTIC Thesaurus Topics

  • Abstracts
  • Acoustic Propagation
  • Boundaries
  • Boundary Layer
  • Classification
  • Demographic Cohorts
  • Flow
  • Flow Fields
  • Holograms
  • Image Processing
  • Leading Edges
  • Security
  • Shock Tubes
  • Sound Waves
  • Stagnation Point
  • Waves
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Fluid Mechanics and Fluid Dynamics.
  • Image Processing and Computer Vision.