Effect of nozzle chevron technology on the near-field contrail properties behind an aircraft engine using a CFD-microphysics coupling

Cantin, Sébastien, Misandeau, Adrien, Chouak, Mohamed et Garnier, François. 2022. « Effect of nozzle chevron technology on the near-field contrail properties behind an aircraft engine using a CFD-microphysics coupling ». Communication lors de la conférence : 25th ISABE Conference (Ottawa, ON, Canada, Sept. 25-30, 2022).

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Résumé

The formation of ice-particles in near-field aircraft plumes at cruise altitudes generates contrails. The latter trigger the formation of large cirrus clouds, called aircraft-induced clouds (AICs). These artificial clouds result in a net positive radiative forcing (warming) effect. Furthermore, the use of chevrons in modern jet engines helped to reduce jet noise of ‘separate-flow’ nozzles; however, the impact of this technology on near-field contrail properties has not been investigated. In this context, this paper presents a CFD-microphysics coupling strategy to model the 3-D dynamics and microphysical transformations in the near-field plume of an aircraft engine. The study investigates the effect of implementing the chevron technology in both fan and core nozzles on plume and ice-particle properties. For this purpose, 3-D unsteady Reynolds-Averaged Navier-Stokes simulations were carried out behind a realistic LEAP-1A engine geometry (high bypass-ratio 10.5:1) at cruise conditions. The microphysical modeling accounts for the main process of water-vapor condensation on pre-activated soot particles known as heterogeneous condensation. The plume dilution and ice crystals formation in the engine near-field jet were validated using available numerical and in-flight data to demonstrate the predictive capabilities of the proposed modeling strategy. Different geometrical parameters of fan- and core-nozzles were investigated by varying the number and the penetration angle of chevrons. The comprehensive analysis showed that core-chevron nozzles lead to higher kinetic turbulent energy, higher liquid saturation ratio, larger ice particles and thicker contrails than chevron fan-nozzles and the baseline nozzle without chevrons. The proposed model can be hence used in future studies to characterize the impact of tabs or lobed nozzle-exit parameters on the optical and microphysical properties of near-field contrails.

Type de document:	Communication (Communication)
Professeur:	Professeur Garnier, François
Affiliation:	Génie mécanique
Date de dépôt:	27 oct. 2022 15:34
Dernière modification:	01 nov. 2022 20:03
URI:	https://espace2.etsmtl.ca/id/eprint/25684

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