Accession Number : ADA131882

Title :   Laser Velocimeter Measurements and Analysis in Turbulent Flows with Combustion. Part 2.

Descriptive Note : Interim rept. 1 Jan-31 Dec 82,


Personal Author(s) : Stevenson,Warren H ; Thompson,H Doyle ; Gould,R D

PDF Url : ADA131882

Report Date : Jul 1983

Pagination or Media Count : 172

Abstract : Laser velocimeter measurements in the highly turbulent flow field following an axisymmetric sudden expansion have been carried out for both isothermal and reacting flows. Mean streamwise velocity and turbulence intensity profiles covering the region from the sudden expansion to well beyond shear layer reattachment are presented. A study of velocity bias conducted as part of this investigation reconfirmed the effectiveness of the experimental bias elimination technique used in earlier studies. Numerical predictions of the isothermal flow field using the k-epsilon turbulence model were made and compared to experimental measurements. Significant differences in the mean velocity profiles were found to exist, with measured velocities in the central part of the flow being consistently higher than those predicted. Combustion was found to increase mean velocities in regions beyond the combustion zone as expected and to significantly alter the structure of the shear layer. Significant reductions in turbulence intensity were observed throughout most of the flow in the reacting flow case. (Author)

Descriptors :   *Combustion, *Turbulent flow, *Flow fields, *Laser velocimeters, Doppler systems, Experimental data, Errors, Expansion, Recirculation, Mathematical prediction, Numerical analysis, Bias, Elimination, Cold flow, Internal, Mass flow, Measurement, Shear properties, Velocity, Intensity, Mathematical models, Coding, Flame holders

Subject Categories : Lasers and Masers
      Test Facilities, Equipment and Methods
      Fluid Mechanics
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE