doi:10.3850/978-981-08-7724-8_04-04

ABSTRACT

The present paper reviews results from previous studies of radiation extinction of diffusion flames based on direct numerical simulation and asymptotic analysis. It focuses particularly on apparent discrepancies between microgravity combustion studies in which radiation extinction is observed at extremely low values of flame stretch (values that may be achieved under microgravity conditions but are unrealistic for earthgravity applications) and in which soot is absent, and smoke-point flame combustion in which extinction is observed under earth-gravity conditions and in which soot is the dominant factor. The general objective of this research is to establish that: (1) the smoke point is a soot-controlled radiation extinction event; (2) and radiation extinction is the dominant flame extinction mechanism under free-burn fire-like conditions.

Keywords: Flame extinction, Thermal radiation, Soot, Smoke point, Microgravity combustion.

© 2011 CPD Unit, University of Leeds