Auteur(s): Sébastien Cantin, François Morency, François Garnier
Date de la conférence: Juin 2021
Conférence: CASI-AERO 2021
Abstract
The potential impact of aviation in the vicinity of airport is a raising problem because of the hazardous particles emitted by aircraft engines. Despite of the diminishing air traffic due to the Covid-19 crisis in 2020, a 4% increase of aviation traffic is expected by 2024 and beyond. To reduce these emissions, new particulate matter (PM) standards for aircraft engines has been adopted by the ICAO in 2019. Consequently, new numerical tools needs to be developed to better characterized the formation of PM at the engine exhaust. In this context, the objective of the present study is to validate a detailed microphysical model capable of modeling the formation of PM and non-volatile PM in the near field of an aircraft engine at ground level. To achieve this, the detailed microphysical model is coupled with a compressible unsteady RANS model to simulate the propellant jet of an aircraft engine composed of gaseous and particulate matter emissions. The microphysics model implemented in a commercial software is coupled with a chemical model to simulate the chemical reactions in the plume. The Lagrangian approach is used to solve the movement of soot particles and liquid aerosols. The microphysics model can simulate soot surface activation by organic vapors as well as sulfur species, and organic vapor condensation on the activated part of the soot surfaces. Also, the soot activation by scavenging of organics and H2SO4-H2O liquid aerosol is considered. The results show a comparison between the experimental data from the measurement campaign NASA APEX-1 and our numerical predictions. At similar atmospheric conditions, the particle size distribution is compared 30-m downstream of the aircraft engine. The mass of sulfate and organic components that condensed on soot particles at 30-m downstream distance is also compared.
