Concentration and Temperature Effects on Soot Formation in Diffusion Flames

Abstract

The effects of fuel dilution on soot formation in laminar diffusion flames is investigated. The lower soot formation rate observed is due to a combination of concentration, temperature and residence time effects. Based on local measurements of the temperature, temperature seems to be the most important effect. Modeling results show that concentration effects are mitigated by diffusional processes associated with the diffusion flame structure. Furthermore, dilution increases the time for soot particle inception to occur, resulting in a decreased residence time for soot growth. The observed effects are most important in the soot inception region and appear to decrease in importance as residence time and sooting propensity increase.KeywordsDiffusion FlamePremix FlameSoot FormationSoot Volume FractionFuel ConcentrationThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.