PARTICLE CONCENTRATION CHARACTERIZATION FOR JET ENGINE EMISSIONS UNDER CRUISE CONDITIONS

Airborne particle measurements during NASA project SUCCESS have shown that particle concentration profiles serve as good indicators of aircr aft exhaust plume encounters. During exhaust plume penetrations there is a strong anticorrelation between the ratio of nonvolatile/total par ticulates and Nitrogen Oxide (NO) concentrations. An increase in fuel sulfur content was found to increase the total particle emission index , while the nonvolatile emission index remained unchanged. The EI's in creased by a factor of 2.6 as the fuel sulfur increased from 70 - 700 ppm. The large particle size distribution (200-400 mm) was seen as a g ood long term indicator of an aircraft exhaust plume.