Accession Number : ADA191967

Title :   Heterogeneous Diffusion Flame Stabilization.

Descriptive Note : Final rept. Oct 83-Sep 87,

Corporate Author : GEORGIA INST OF TECH ATLANTA SCHOOL OF AEROSPACE ENGINEERING

Personal Author(s) : Strahle, Warren C ; Jagoda, Jechiel I

PDF Url : ADA191967

Report Date : 29 Nov 1987

Pagination or Media Count : 13

Abstract : Analytical modelling and several experimental diagnostics were applied to an experimental flow in a two-dimensional subsonic windtunnel with a backward facing step and provision for injection of inerts and combustibles through the porous floor behind the step. The analytical techniques were based on a two equation modeling of turbulence with several variants of near wall models and numerical approaches. Conventional experimental techniques, where applicable in the cold flow, included hot film and pitot and anemometry. Laser - based diagnostics in the cold and hot flows for velocity and species concentration measurements (both mean and instantaneous) included laser velocimetry in two components and Rayleigh molecular scattering. Major findings in this complex turbulent flow with chemical reactions were a) there was a general agreement between analysis and experiment in cold flow both with and without wall injection, b) this agreement occurred at the the most detailed level of turbulent shear stress and mass transport, c) in hot flow there was acceptable agreement as to the gross features of the mean flow field, but some theoretical details, such as reattachment length, went counter to experimental results.

Descriptors :   *TURBULENT FLOW, *FLAME PROPAGATION, *COMBUSTION STABILITY, ANEMOMETERS, CHEMICAL REACTIONS, COLD FLOW, DIAGNOSIS(GENERAL), DIFFUSION, EQUATIONS, EXPERIMENTAL DESIGN, FILMS, FLAMES, FLAMMABILITY, FLOORS, FLOW, FLOW FIELDS, HETEROGENEITY, HIGH TEMPERATURE, INJECTION, LASER VELOCIMETERS, LASERS, MASS TRANSFER, MEAN, METHODOLOGY, MODELS, MOLECULES, NUMERICAL METHODS AND PROCEDURES, PITOT TUBES, POROUS MATERIALS, RAYLEIGH SCATTERING, SHEAR STRESSES, STABILIZATION, TURBULENCE, VARIATIONS, WALLS, RAMJET ENGINES, SOLID JET ENGINE FUELS, SIMULATION, TWO DIMENSIONAL FLOW, LASER VELOCIMETERS, SUBSONIC WIND TUNNELS

Subject Categories : Combustion and Ignition
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE