Accession Number : ADA195501

Title :   Fuel Structure and Pressure Effects on the Formation of Soot Particles in Diffusion Flames.

Descriptive Note : Annual rept. 15 Jan 87-14 Jan 88,

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

Personal Author(s) : Santoro, Robert J

PDF Url : ADA195501

Report Date : 15 Feb 1988

Pagination or Media Count : 33

Abstract : During the first year of the present grant, efforts have concentrated on examining the effects of fuel molecular structure on soot formation in diffusion flames. Studies involving alkane, alkene, alkyne and aromatic fuel species have been studied with specific attention given to the surface growth process. Analysis of these studies has demonstrated a strong fuel structure dependence for the amount of soot formed, the conversion percentage of fuel carbon to soot, and the soot particle surface area present in these diffusion flames. However, when surface area taken into account, similar specific surface growth rate coefficients are observed for all the fuels studied. These results point to a similar surface growth process for all the fuels. Consistent with premixed flame results, the present studies show a continual decrease in this specific surface growth rate coefficient with time. Other effects of fuel structure observed include an acceleration of the inception of soot particles to lower locations and, thus, earlier times in the flame as soot conversion percentage increases. These results also point to the importance of the initial particle inception process which appears to control subsequent soot particle evolution. Keywords: Soot formation; Soot particles; Diffusion flames.

Descriptors :   *FLAMES, *FUELS, *MOLECULAR STRUCTURE, *SOOT, ACCELERATION, ALKENES, ALKYNES, AROMATIC COMPOUNDS, CARBON, CONVERSION, DIFFUSION, EVOLUTION(GENERAL), GROWTH(GENERAL), MIXING, PARTICLES, PRESSURE, SURFACES

Subject Categories : Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE