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Etude expérimentale de l'interaction flamme-paroi instationnaire dans des conditions initiales non isothermes

Abstract : During combustion in spark ignition engine, the flame is modified by the wall when only 20% of charge is burned. So it is necessary to study the flame-wall mechanisms in order to develop and improve spark ignition engines. Through this work, unsteady flame-wall interaction is studied experimentally considering both laminar and turbulent regimes in non-isothermal initial conditions. Wall temperature Tw varies between 300 and 500 K but unburned gases are at ambient temperature. The issue of this study is to understand the phenomena involved and to provide reference data for flame-wall simulation. In laminar regime, maximal density of wall heat flux qwmax increases with Tw for both head-on and side-wall quenching. Quenching distance decreases when Tw increases for head-on quenching but is constant for side-wall quenching. For this type of quenching, stretch is not insignificant. Considering turbulent regime, at stoichiometry, qwmax decreases because of turbulence in comparison with laminar regime. When fuel-air ratio is equal to 0,7, it is the opposite. So the flow produces a shear to the flame front at stoichiometry and a convection phenomenon on the flame propagation when fuel-air ration is equal to 0,7. At stoichiometry, the effect of stretch is higher than wall temperature effect on turbulent flame-wall interaction.
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Submitted on : Friday, October 19, 2012 - 2:48:04 PM
Last modification on : Wednesday, October 20, 2021 - 3:22:14 AM
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  • HAL Id : tel-00743578, version 1



Laëtitia Muller. Etude expérimentale de l'interaction flamme-paroi instationnaire dans des conditions initiales non isothermes. Autre. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2012. Français. ⟨NNT : 2012ESMA0006⟩. ⟨tel-00743578⟩



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