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Reference : UMR7274-PIEGLA-001
Workplace : NANCY
Date of publication : Wednesday, April 07, 2021
Scientific Responsible name : Pierre-Alexandre Glaude
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 September 2021
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
Despite the growth of the electric vehicle fleet, spark-ignited petrol engines will still account for at least 50% of light vehicles over the next decade, while the share of diesel engines is set to decline. The SI engine will become the most widely used engine, with increasing electric hybridization. Direct injection (DI) SI engines provide substantial fuel economy, but suffer from significant soot emissions caused by the combustion of the fuel film that settles on the walls. At the same time, in order to reduce dependence on fossil fuels and lower net CO2 emissions, oxygenated biofuels are favored by the EU. The percentage of ethanol in gasoline, currently 10%, will be increased in the next years. New biofuels, such as heavier alcohols, also present alternatives with better benefits in terms of CO2 emissions. Although oxygenated fuels tend to reduce soot emissions, they pose new pollution problems. They can increase aldehyde and NOx emissions and change the characteristics of soot and toxic polycyclic aromatic hydrocarbons (PAHs).
The OFELIE project, founded by the French National Research Agency (ANR) and which brings together IFPEN, LRGP, PC2A, PSA and Renault, aims to model and simulate the formation of soot and pollutants in direct injection SI engines in order to develop low emission DI-SI engines. The aim of the proposed thesis is to develop a detailed kinetic model of the combustion of gasoline incorporating alcohols, capable of predicting the main combustion parameters and the formation of pollutants, in particular aldehydes, nitrogen oxides and PAHs, which are the main precursors of soot. The development of the mechanism will be based on the use of theoretical chemistry methods to examine new reaction pathways and to estimate the necessary thermodynamic and kinetic constants. The model will be validated by comparison with experimental results from the literature or obtained by the project partners. The final model will be used by engine manufacturers to simulate the combustion chamber of the DI engine.
The Laboratory Reactions and Process Engineering (LRGP) is a Joint Research Unit of the CNRS and the University of Lorraine. It is located in Nancy, France's second biggest student city. It is mainly located in the city center, in the premises of the National School of Chemical Industries of Nancy (ENSIC). The research lab is a leading chemical and process engineering laboratory in France and in the world (18 CNRS researchers, 82 research professors and lecturers, 43 technical and administrative employees as well as 180 non-permanent staff: contract researchers, PhD students, post-doctoral fellows and master students). The Radical Kinetics Group is part of the laboratory and has an international recognized expertise in combustion kinetics, both on the experimental and modelling sides. Existing experimental devices to study these phenomena include shock tube, laminar flames and jet-stirred reactor experiments. The hired candidate will have the opportunity to join a multidisciplinary group composed of 7 PhD students and 4 permanent academic researchers working in the field of energy and environment. Research projects funded by ERC, ANR and industrials cover subjects such as thermochemical conversion of biomass, safety for the incineration of pesticides or solid plastic waste, battery fire safety, pollutants formed in motor engines and hypersonic propulsion. Our group offers an immersion in renewable biofuels production, aging and combustion and in pollutants mitigation and fire safety technologies.
We offer: a multi-disciplinary formation and training using state-of-the-art research equipment, participations in national or international schools, conferences and workshops. The PhD student will also follow high-level formations in the SIMPEE Doctoral School of Université de Lorraine.
Desired profile: Master or Engineer degree in chemical engineering, chemistry, physics or related fields; interest for modeling and simulation. Experience in the field of molecular modeling would be welcome
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