RECENT EXPERIMENTAL INVESTIGATIONS ON THE SCATTERING OF SOUND BY TURBULENCE

Abstract

Experimental investigations of the scattering of sound by turbulence were performed in a wind tunnel. Recent theoretical predictions concerning the sound attenuation are well confirmed and partly extended by the measurements. In the range of the parameters which is of interest for practical applications the most important results obtained are the proportionality of the sound attenuation to the square of the sound frequency and to the square of the turbulent Mach number. A formula is derived from which the turbulent attenuation of directed sound (such as aircraft noise in the free atmosphere) can be calculated. A method for measuring large phase variations is described in preliminary form; it will be used to investigate the influence of turbulent scattering on the phase angle of the sound waves.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1963
Accession Number
AD0443152

Entities

People

  • Dieter W. Schmidt

Organizations

  • AGARD

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Acoustic Signals
  • Air Force
  • Aircrafts
  • Dynamic Pressure
  • Flow
  • Frequency
  • Laminar Flow
  • Mach Number
  • Measurement
  • National Security
  • Shock Waves
  • Sound Waves
  • Time Intervals
  • Turbulent Flow
  • Wave Propagation
  • Waves

Fields of Study

  • Physics

Readers

  • Auditory Neuroscience/Auditory Physiology.
  • Calculus or Mathematical Analysis
  • Fluid Dynamics.