Accession Number : AD0776084

Title :   Modulation of Acoustic Wave by Turbulent Shear Flow.

Descriptive Note : Interim technical rept.,

Corporate Author : JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF MECHANICS AND MATERIALS SCIENCE

Personal Author(s) : Chih-ming,Ho ; Kovasznay,Leslie S. G.

Report Date : FEB 1974

Pagination or Media Count : 205

Abstract : The collimated monochromatic and coherent acoustic wave, (a sine wave of 3 KHz-90 KHz), was directed perpendicularly across a two-dimensional turbulent jet. Extensive study of the statistical properties of both the turbulent flow and of the received wave (amplitude and phase modulation) offers physical insight into the general phenomenon of a periodic pressure field scattered by a random solenoidal velocity field. In addition, there is strong indication that the acoustic wave may be used as a diagnostic tool for measuring some statistical properties of the turbulence velocity field. (Author)

Descriptors :   *Acoustic waves, *Turbulent flow, *Pressure, Shear properties, Stochastic processes, Correlation techniques, Amplitude modulation, Phase modulation, Anemometers, Data processing, Atmospheres

Subject Categories : Atmospheric Physics
      Acoustics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE