Accession Number : ADA310030

Title :   Detailed Studies of Soot Formation in Laminar Diffusion Flames for Application to Modeling Studies.

Descriptive Note : Final rept. 1 Feb 93-30 Jun 95,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Santoro, Robert J.

PDF Url : ADA310030

Report Date : 30 JAN 1996

Pagination or Media Count : 104

Abstract : An investigation of soot formation in laminar diffusion flames showed that soot particle surface growth under laminar diffusion flame conditions ceases because of the depletion of hydrocarbon species and not soot particle reactivity loss due to thermal aging of the particles. This result was obtained through direct species concentration measurements under well-controlled conditions, while the particle reactivity effects were calculated based on premixed flame results along with particle temperature/time information available from earlier laminar diffusion flame studies. Comparisons with a soot formation model which incorporated detailed chemistry effects showed good agreement in terms of predicted and measured species concentration and soot particle field evolution. In addition, a novel technique for measuring soot volume fraction was developed based on laser-induced incandescence and was successfully applied to similar laminar diffusion flame studies. This technique was extended to droplet and turbulent diffusion flame conditions where a two-dimensional imaging approach was employed to measure soot volume fraction. Finally, the complete data set from these studies was assembled in a form suitable for dissemination on computer diskettes throughout the research community for comparison with modeling efforts.

Descriptors :   *SOOT, *FLAME PROPAGATION, THERMAL PROPERTIES, DATA BASES, MATHEMATICAL MODELS, YAG LASERS, SPATIAL DISTRIBUTION, LIGHT SCATTERING, BENZENE, AGING(MATERIALS), REACTIVITIES, TURBULENCE, PULSED LASERS, LASER APPLICATIONS, COMBUSTION DEPOSITS, PARTICLES, THERMAL DIFFUSION, ACETYLENE, FUEL AIR RATIO, SURFACE CHEMISTRY, LAMINAR FLOW, CHEMICAL EQUILIBRIUM, THERMAL DEGRADATION, CONCENTRATION(CHEMISTRY), GAS CHROMATOGRAPHY, HYDROXYL RADICALS, MASS SPECTROMETRY, COMBUSTION PRODUCTS, INCANDESCENCE.

Subject Categories : Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE