Afkari, Parisa, Chouak, Mohamed, Cantin, Sébastien et Garnier, François.
2026.
« Role of soot particle properties and activation in contrail formation using LES with online-coupled microphysics ».
Journal of Aerosol Science, vol. 194.
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Résumé
Aircraft contrails form through ice crystal nucleation initiated primarily by engine-emitted particles. These ice crystals can lead to persistent contrails, contributing to climate warming, thus making understanding their activation a key target for mitigation strategies. This study presents large eddy simulations (LES) coupled with a refined soot activation model. The microphysical scheme incorporates solute effects through the hygroscopicity parameter (κ), enabling a more realistic representation of water activity during soot particle activation. These numerical simulations utilized a LEAP-1A engine under realistic cruise conditions, examining three scenarios: (i) varying κ (0.0005, 0.005, 0.0142), corresponding to an equivalent fuel sulfur content (FSC) of 50, 410, and 1270 ppm, respectively; (ii) varying initial soot emission indices (1013–1015 #/kg-fuel), and (iii) varying initial soot core radii (10–30 nm). The results indicated that reducing κ from 0.0142 to 0.0005 slightly reduced ice particle radii, yet increased the activation fraction by ~20% due to enhanced water vapor availability. Reducing the initial soot number in two successive steps, from 1015 to 1013 #/kg-fuel, increased the mean ice particle radius from ~0.3 μm to 2.4 μm in 1 s and elevated the activated fraction by ~66%. Larger initial soot core radii enhanced activation by ~20%, with mean ice particle radius differences reaching ~80% in around 0.4 s and narrowing to ~10% by 1s. Additionally, the results highlighted the importance of 3D LES with online-coupled microphysics, whereas the 0D offline box model overpredicted activation more than 50% and misrepresented the κ sensitivity.
| Type de document: | Article publié dans une revue, révisé par les pairs |
|---|---|
| Chercheur(-euse): | Chercheur(-euse) Garnier, François |
| Affiliation: | Génie aérospatial |
| Date de dépôt: | 17 avr. 2026 20:35 |
| Dernière modification: | 22 avr. 2026 20:51 |
| URI: | https://espace2.etsmtl.ca/id/eprint/33603 |
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