A Study of Narrow Band Noise Generation by Flow Over Ventilated Walls in Transonic Wind Tunnels

Abstract

The report is concerned with the problem of environmental noise in transonic wind tunnels with ventilated, or perforated, walls. A brief critical review of past experimental investigations of such sounds is given. It is indicated that the instability of the separated shear layer over the cavities in a perforated wall should be the main agency for sound generation. A stability analysis of a nonparallel shear flow is undertaken. Relations such as the Strouhal numbers and minimum breadths, are given in terms of wind-tunnel aerodynamic parameters.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1973
Accession Number
AD0758254

Entities

People

  • James P. Woolley
  • Krishnamurty Karamcheti

Organizations

  • Nielsen Engineering & Research (United States)

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Compressible Flow
  • Fluid Dynamics
  • Fluid Flow
  • Frequency
  • Geometry
  • Incompressible Flow
  • Mach Number
  • Measurement
  • Mechanics
  • Reynolds Number
  • Shear Flow
  • Steady Flow
  • Transonic Wind Tunnels
  • Turbulent Flow
  • Turbulent Mixing
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Systems Analysis and Design