With the development of aviation industry, it is urgently to investigate the
soot formation properties of aviation kerosene to better control the soot
emissions. The dilutive, chemical and radiative effects of CO2on the soot
inception, condensation and HACA growth processes in laminar co-flow Jet-A1
kerosene diffusion flames were numerically investigated by employing detailed
chemical mechanisms and soot sectional models. The results showed that the
addition of CO2dramatically decreased the maximum temperature (by 92
K)and soot volume fraction (by 41.0%). The dilutive effect of CO2 contributed
the most to the decrease of temperature and soot volume fraction. It also was
the main factor in the decrease of soot inception, condensation and HACA
growth processes. The chemical effect of CO2had little impact on the
decomposition of fuels into light hydrocarbons, but obviously limited the
growth of light hydrocarbons to A1. The radiative effect of CO2decreased the
maximum temperature and soot volume fraction by 13 K and 5.2% (from 1.92 to
1.82 ppm). It had little impact on the soot inception, condensation and HACA
growth rates.