Development and Application of Novel Sampling Methodologies for Study of Volatile Particulate Matter in Military Aircraft Emissions.

摘要

Understanding the contribution of aircraft emissions to atmospheric particles starts with accurate measurement of volatile particles in the engine exhaust. We focused on the development of an advanced sampling and measurement system consisting of a dilution chamber (DC) and vapor-particle separator (VPS). Results using monodisperse synthetic particles indicate nonvolatile nanoparticles evaporated through sublimation thus their population size remained unchanged but the number concentration decreased as the temperature increased. Volatile particles shrink and evaporate thereby reducing both the particle population size and number concentration. The results unequivocally apply to both particles from conventional diesel compression and turboshaft engine emissions. The VPS could also be used to generate thermogram that can be used to derive evaporation kinetics and energy barrier; both are fundamental quantities of the thermal behavior of an aerosol population.