Accession Number : AD0766781

Title :   Turbulence Measurements with a Laser Doppler Velocimeter,

Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s) : Yanta,William J.

Report Date : 01 MAY 1973

Pagination or Media Count : 84

Abstract : Turbulence measurements with a Laser Doppler Velocimeter (LDV) using the dual scatter or differential Doppler mode have been made in a subsonic, fully developed channel flow. The measurements were made using only those light scattering particles occurring naturally in air. Results include mean velocity profiles, turbulence intensities, Reynolds stress distributions and a skewness measurement of the velocity distribution function across the channel. Statistical techniques were used to obtain the various turbulence parameters. Guidelines have been established for the amount of data needed to obtain results with a specified accuracy and confidence level. Measurements have also been made to determine the particle-size distribution. An aerodynamic means was used to determine the size distribution, in contrast to the usual optical procedures. (Modified author abstract)

Descriptors :   (*TURBULENCE, MEASUREMENT), FLOWMETERS, DOPPLER SYSTEMS, WIND TUNNELS, AEROSOLS, PARTICLE SIZE, DISTRIBUTION FUNCTIONS, VELOCITY, INTENSITY, SCATTERING

Subject Categories : Test Facilities, Equipment and Methods
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE