EFFECT OF AIRCRAFT EXHAUST SULFUR EMISSIONS ON NEAR-FIELD PLUME AEROSOLS

A two dimensional, axisymmetric flowfield model with coupled gas phase oxidation kinetics and aerosol nucleation and growth dynamics is used to evaluate the effect of fuel sulfur oxidation in the Concorde engin e on the formation and growth of volatile H2SO4/H2O aerosols in the ne ar field plume. Rased on estimated exit plane sulfur speciation, resul ts are shown for between 2% add 20% conversion of the fuel sulfur to S (VI) (SO3 and H2SO4) in engine. The primary motivation is to provide e stimates for the changes in the number density and surface area densit y of sulfuric acid aerosols due to sulfur oxidation in the engine. Thi s analysis indicates the need for experimental measurements of sulfur emissions at the exhaust exit, in addition to soot properties, to full y assess the atmospheric impact of aircraft emissions.