SURFACE AND VOLUME SOUND FROM BOUNDARY LAYERS,

Abstract

It is shown for turbulent boundary layers that surface, dipole sound is in general very much less than volume, quadrupole sound. This is so for two reasons: first, the relative volume sound is increased by several orders of magnitude because of shear-flow enhancement within the boundary layer. Secondly, the dipole sound intensity is shown, through the use of image argument similar to that used in the discussion of flat boundary layers, to be reduced by a factor of (L/R) squared where L is the boundary layer thickness and R is the surface radius of curvature. A discussion of irregular surface bumps shows that such imperfections may be the source of significantly large dipole sound. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1963
Accession Number
AD0600476

Entities

People

  • William C. Meecham

Organizations

  • University of Minnesota

Tags

DTIC Thesaurus Topics

  • Boundaries
  • Boundary Layer
  • Curvature
  • Flow
  • Geometric Forms
  • Geometry
  • Intensity
  • Layers
  • Lines (Geometry)
  • Shear Flow
  • Thickness
  • Turbulent Boundary Layer

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Plasma Physics / Magnetohydrodynamics