An Experimental Investigation of Techniques to Suppress Edgetones from Perforated Wind Tunnel Walls

Abstract

The aerodynamic noise emitted by perforated walls in transonic wind tunnels has been under study for several years at AEDC. This report presents a summary of recent experimental tests to suppress perforated wall noise in transonic test sections. The mechanism of noise generation from perforated walls having 60-deg inclined holes is the edgetone phenomenon where the shear layer over each hole interacts with the trailing edge to produce intense tones at discrete frequencies. Noise reduction was achieved with several modified wall samples in the 6-in. tunnel at resonance conditions.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1975
Accession Number
ADA013728

Entities

People

  • C. F. Anderson
  • N. S. Dougherty Jr.
  • R. L. Parker Jr.

Organizations

  • Arnold Engineering Development Complex

Tags

Communities of Interest

  • Air Platforms
  • Counter IED

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Acoustic Waves
  • Air Force
  • Boundary Layer
  • Government Procurement
  • Governments
  • Mach Number
  • Noise
  • Noise Reduction
  • Pressure Distribution
  • Reynolds Number
  • Sound Waves
  • Standards
  • Tennessee
  • Trailing Edges
  • United States
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Fluid Dynamics.
  • Fluid Mechanics and Fluid Dynamics.