An Experimental Investigation of the Acoustic Characteristics of a Variety of Slot Baffle Configurations for Transonic Wind Tunnel Walls

Abstract

A parametric study of various slot baffle geometric configurations was performed in an effort to find an improvement to the acoustic characteristics of baffled slotted walls used in the NASA/Ames Research Center transonic wind tunnels. The desired improvement was to reduce the aerodynamic noise generated by these walls. Parameters studied were baffle inclination angle, shape, and depth. A modification to wall samples which effectively suppressed the noise generated by the baffled slots was a fine-mesh wire screen overlay in combination with baffle inclination angle. The degree of tunnel was noise suppression achieved in the experiments was a factor of six less than the configuration now in use.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1979
Accession Number
ADA070261

Entities

People

  • N. S. Dougherty Jr.

Organizations

  • Arnold Engineering Development Complex

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Acoustic Phenomena
  • Air Force
  • Background Noise
  • Boundary Layer
  • California
  • Engineering
  • Fluid Dynamics
  • Frequency
  • Mach Number
  • Measurement
  • Standards
  • Standing Waves
  • Static Pressure
  • Suction
  • Transonic Wind Tunnels
  • United States
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Aerodynamics/Aeronautics.
  • Combustion and Flow Dynamics.