Modeling Jet Engine Aerosols in the Postcombustor Flow Path and Sampling System

Aircraft emissions contribute to climate change in the atmosphere and air pollution in the neighborhood of airports. Assessment of the magnitude of the environmental impact of these emissions calls for the combined use of measurements and modeling studies. This paper addresses the use of a computational-fluid-dynamics-based modeling and simulation tool that accounts for and integrates fluid dynamics, chemistry, and particle microphysics relevant to aircraft emissions. The models include sulfate and nitrate aerosol precursors, thermophoresis, coagulation, nucleation, soot activation, condensation/evaporation, and interaction between the gaseous species and theparticles.Thecurrentcapabilitiesaredemonstratedbytheresultsofseveralapplications:the firststageofahighpressureturbine,thesamplingprobes,thesamplinglines,andapressure-reductionchamber.Theyindicatethatthis modelingandsimulationtoolcanbeusedtocomplementtheexperimentalstudiesaswellastoassistthedevelopment of sampling and measurement methodology for particle emissions.