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Etude expérimentale des modes de combustion essence sous forte pression et forte dilution

Abstract : Faced with the current and future more and more drastic standards for pollutant emissions, car manufacturers try to improve the efficiency of Spark Ignition engine. One effective and applicable ways to reduce the greenhouse emissions (CO2) in the short run is based on the reduction of the engine size while preserving their performance thank to turbocharging: eco-supercharging or « downsizing » approaches. One of the characteristics of this operating mode is the high level of the pressure and of the dilution rate of the medium in which the premixed flame propagates. The simulation of turbulent premixed flame is nowadays an indispensable tool for R&D. However, the assumptions on which the combustion models are based, particularly the flamelet model, can be prone to discussion in the « downsizing » conditions. The objective of this work is thus to study experimentally the combustion regimes in order to validate or not the use of these models. Turbulence parameters and flow fields were then characterized out during the compression stroke for several intake pressures by using Particle Imaging Velocimetry technique. The laminar burning velocity was estimated by using reduced chemical kinetic schemes. The Mie scattering laser tomography technique with and without temporal follow-up, enabled us to characterize the turbulent burning velocity and the flame front structure for different intake pressures and dilution rates. In this study, a break in the evolution of the IMEP and the turbulent burning velocity for a dilution rate of 25% has been obtained: this break was linked to the transition between the flamelet zone and the distributed reaction zones.
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https://tel.archives-ouvertes.fr/tel-00461253
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Submitted on : Thursday, March 4, 2010 - 9:36:12 AM
Last modification on : Thursday, March 5, 2020 - 6:49:02 PM
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  • HAL Id : tel-00461253, version 1

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Ludovic Landry. Etude expérimentale des modes de combustion essence sous forte pression et forte dilution. Autre. Université d'Orléans, 2009. Français. ⟨NNT : 2009ORLE2020⟩. ⟨tel-00461253⟩

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