Abstract
Particulate matter (PM) has harmful effects on human health. Ccharacteristics of PM and its compositions inside and outside of flame were required to develop reduction technologies for combustion origin PM. In this paper, relationship between PM size distribution and compositions such as soot and soluble organic fraction (SOF) of filter sampled PM were investigated. A laser induced incandescence (LII) method was used to obtain spatial distribution of soot in a laminar diffusion benzene flame. PM at the LII region in the flame and exhaust PM from the flame tip were directly sampled on a glass fiber filter. Compositions of PM sampled from inside and outside of the flame were characterized using a combustion type PM analyser (MEXA-1370PM). In addition, size distributions of PM were measured using an ELPI (Electrical Low Pressure Impactor). It was confirmed that main composition of PM in the flame (In-flame PM) was nuclei or aggregation mode particle (particle diameter is 150nm) with SOF of low boiling point, but PM emitted from the flame tip (Out-flame PM) was aggregation mode particle (about 400nm) with SOF of high boiling point.
