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PhD Student, Hydrogen combustion for the decarbonization of industrial systems (M/F)

This offer is available in the following languages:
Français - Anglais

Date Limite Candidature : lundi 29 août 2022

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General information

Reference : UPR3021-CHRCHA-002
Workplace : ORLEANS
Date of publication : Friday, July 29, 2022
Scientific Responsible name : Fabien HALTER, Christian CHAUVEAU, Guillaume DAYMA
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 October 2022
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

Hydrogen is seen as a promising fuel to decarbonize industrial processes and most specifically combustion processes. But burning H2 raises several technological and scientific challenges due to the specific features of the H2 molecule with respect to standard hydrocarbon fuels. Indeed, H2 flames are barely visible with human eyes compared to hydrocarbon fueled flames, but their strong OH* natural emission in the UV band around 310 nm is easily detectable by many optical devices already available in industry. This makes OH* an ideal candidate to deduce information on the combustion state and locate the flame region in the combustor. However, the OH* signal is generally not accessible in numerical flow simulations except in canonical flames within oversimplified burner geometries. Another easily detectable emission in H2/air flame is NO* with emission peaks around 250 nm. This species delineates regions of high temperatures with formation of nitric oxides, the main pollutant from H2/air flames.

Objectives & Methods
The scientific challenges of the present PhD thesis are to acquire a detailed dataset of hydrogen/air OH* and NO* measurements. The dataset will be generated for premixed flames archetypes in laminar steady and in turbulent configurations at different mixture temperatures and pressures. It will then be used by another Team in CERFACS (Toulouse) to validate high-fidelity numerical predictions based on Direct Numerical Simulation (DNS) and Large Eddy Simulation (LES). In particular, sub-mechanisms for OH* and NO* formation will be included to standard H2-air chemistry allowing a direct comparison with experimental recordings. Reconstruction of the OH* signal will also allow quantitative comparison with measurements. The validation cases include exploring effects of temperature, pressure and unsteadiness with the objective to reconstruct numerically the OH* light signal in the simulations. As NO* has been seldom explored, validations will be carried for a reduced set of configurations for this second species.
Predicting the OH* and NO* signals with confidence will allow a breakthrough for the simulation of H2 combustion processes and a better understanding of the structure of H2/air flames and their resulting NOx emissions by direct cross comparisons with experiments opening the path for burner optimization, a step which is necessary for the transition to decarbonized combustion.

Work Context

Located on the CNRS campus in Orléans, the PhD student will join the Combustion & Turbulence team of the Institute of Combustion, Aerothermics, Reactivity and Environment (ICARE), which has about 80 people.
A degree in the following disciplines is required: combustion, physics, chemistry, fluid mechanics or thermodynamics. A good level of English is required as well as the ability to work in a team.
A particular interest in experimentation will be appreciated.

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