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Modélisation des traînées de condensation par interaction entre l'aérodynamique, la cinétique chimique et la microphysique

Abstract : In the framework of the impact of aviation on climate change studies, the involvement of contrails is identified as one of the most uncertain components. In this context, this study aims to better describe the physico-chemical properties of the plume in the near-field of an aircraft, for they could be critical to contrails properties.To this end, RANS spatial simulations have been performed using the code CEDRE of ONERA, taking into account the microphysical processes, chemical reactions, and the air flow around and in the wake of a realistic civil transport aircraft. Microphysical models have been implemented in order to describe the soot activation processes and the condensation and evaporation of water upon their surface.A validation phase of the code has been carried out for each of the processes taken into account, showing good agreements with data from the literature. Sensitivity studies have also been performed in order to assess the impact of atmospheric parameters and exhaust characteristics on formed contrails properties. The increase of the fuel sulphur content leads to increased soot activation that results in a shorter contrail onset and increased contrail opacity. If the amount of emitted water is sufficient, the increase of the number of ejected soot particles causes an increase of ice concentration that results in an important increase of contrail opacity and surface area.
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https://tel.archives-ouvertes.fr/tel-01403100
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Submitted on : Friday, November 25, 2016 - 2:33:33 PM
Last modification on : Monday, June 14, 2021 - 10:41:19 AM
Long-term archiving on: : Tuesday, March 21, 2017 - 6:16:23 AM

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  • HAL Id : tel-01403100, version 1

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Jean-Charles Khou. Modélisation des traînées de condensation par interaction entre l'aérodynamique, la cinétique chimique et la microphysique. Mécanique des fluides [physics.class-ph]. Université Pierre et Marie Curie - Paris VI, 2016. Français. ⟨NNT : 2016PA066164⟩. ⟨tel-01403100⟩

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