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Etude expérimentale de la dispersion de particules ultrafines dans le sillage de modèles simplifiés de véhicules automobiles

Abstract : Around 7 million worldwide annual death sare due to air pollution. Among all pollutants, UltrafineParticles (UFP) cause strong adverse effects. Due to road transport, UFP exposure reaches its most significant levels in urban areas. In this thesis, the aim is to assess the links between the wake flow properties of simplified car models(Ahmed bodies) and UFP number concentration fields due to exhaust emission. This study enables the knowledge about UFP exposure levels of all road users at vehicle wake scale to be better understood. Three simplified car models with three corresponding rear slant angles have been used in order to reproduce the principal wake structures of road vehicles in a wind tunnel. Thanks to an innovative data processing method, velocity measurements with two techniques(LDV/PIV) point out the major role of the rear slantangle on the model wake structures. Moreover, comparisons have been made with particle number concentration measurements of UFP in the wake of the same models. We highlighted the link between the volume of the toric recirculation region close to the rear and the vertical dispersion of UFP. Furthermore, longitudinal vortices that exist with the intermediate rear slant angle geometry play an important role on the transversal dispersion as well as on the concentration field symetry.
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https://tel.archives-ouvertes.fr/tel-01951294
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Submitted on : Tuesday, December 11, 2018 - 12:33:10 PM
Last modification on : Tuesday, September 8, 2020 - 2:58:11 PM
Long-term archiving on: : Tuesday, March 12, 2019 - 2:28:28 PM

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  • HAL Id : tel-01951294, version 1

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Romain Rodriguez. Etude expérimentale de la dispersion de particules ultrafines dans le sillage de modèles simplifiés de véhicules automobiles. Mécanique des fluides [physics.class-ph]. École centrale de Nantes, 2018. Français. ⟨NNT : 2018ECDN0032⟩. ⟨tel-01951294⟩

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