Accession Number : ADA157554


Title :   The Measurements of Axisymmetric Air Turbulent Jet Flow with an Individual Realization Laser Velocimeter System,


Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH


Personal Author(s) : Shen,X ; Yu,H ; Chen,D ; Xie,S


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a157554.pdf


Report Date : 29 May 1985


Pagination or Media Count : 23


Abstract : This paper describes the measurements of axisymmetric air turbulent jet flow with the use of an IRLV system. The distributions of axial mean velocity, turbulent intensity and probability density functions of velocity in the initial region of jet flow were obtained. The data from LV were sampled and processed automatically by a microprocessor. The experiments show that the velocity measurements can be realized even with the air particles in their natural state. The measurements of the mean velocity were also simultaneously made with aa hot wire anemometer in order to compare with those made with a LV. Their results were in good coincidence in the core flow region. The velocity bias was increased with the decrease of data rate and increase of turbulent intensity in the mixing boundary layer. Keywords: Laser velocimeters (LV); Velocity measurements. (Translations)


Descriptors :   *LASER VELOCIMETERS , VELOCITY , FUNCTIONS , MEASUREMENT , MICROPROCESSORS , AIR , INTENSITY , BOUNDARY LAYER , TURBULENCE , LASERS , PARTICLES , TRANSLATIONS , MIXING , MEAN , BIAS , CHINA , CHINESE LANGUAGE


Subject Categories : Lasers and Masers
      Test Facilities, Equipment and Methods


Distribution Statement : APPROVED FOR PUBLIC RELEASE