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Etude de l'influence de la dilution à la vapeur d'eau H2O d'une flamme CH4/air enrichi en dioxygène O2. Combustion Optimisée pour le Captage de CO2

Abstract : This PhD thesis deals with the analysis of the effects of exhaust gas recirculation (EGR) through the study of the dilution by carbon dioxide and more particularly of the water steam on dioxygen enriched methane/air flames, in the case of a premixed pressurized combustion encountered in gas turbines. CH4/O2/H2O/N2 pressurized laminar burning velocity measurement were obtained using a spherical flame propagating freely in a closed chamber. The analysis of the experimental results made it possible to check the validity of the kinetic scheme GRIMech.3.0 through numerical calculations of one-dimensional free flames. Further calculations allowed the establishment of a database (laminar burning velocity, Markstein length and Lewis number, adiabatic combustion temperature and flame thickness) as a function of combustion input parameters (temperature, pressure, X(H2O), equivalence ratio and dioxygen enrichment). The additional experimental study under turbulent regime, the flames diluted with H2O and CO2 allowed to highlight the effect of the laminar burning velocity on the average structures and the stability of turbulent flames. It also allowed to analyze the parameters (adiabatic flame temperature, pressure, X(H2O), X(CO2), X(N2), laminar burning velocity) which have an important role in the production of CO pollutants and NO.
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https://tel.archives-ouvertes.fr/tel-02345173
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Submitted on : Monday, November 4, 2019 - 2:05:18 PM
Last modification on : Thursday, November 28, 2019 - 3:55:08 AM
Long-term archiving on: : Wednesday, February 5, 2020 - 7:24:10 PM

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  • HAL Id : tel-02345173, version 1

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Juan Pablo Chica Cano. Etude de l'influence de la dilution à la vapeur d'eau H2O d'une flamme CH4/air enrichi en dioxygène O2. Combustion Optimisée pour le Captage de CO2. Thermique [physics.class-ph]. Normandie Université, 2019. Français. ⟨NNT : 2019NORMR029⟩. ⟨tel-02345173⟩

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