Development of a LES method for characterising the impact of mixture preparation on combustion stability in H2 SI engines

On July 14, 2021, the European Commission adopted a set of ambitious and voluntary proposals to reduce its net greenhouse gas emissions by 55% by 2030 compared to 1990 levels and to achieve climate neutrality by 2050. Among industrial sectors, maritime transport, which has seen significant growth over the past 30 years, as well as rail transport and off-road
sectors (such as construction and mining), have committed to drastically reducing their C02 emissions. While battery-powered electric motors and hydrogen are promising solutions in some transport sectors, they cannot be considered when power and range are critical factors.
Carbon-neutral fuels, such as ethanol, methanol, and even ammonia, can be used to power internal combustion engines. In the case of high-power engines, compression ignition, such as Diesel combustion, requires fuels that are conducive to self-ignition, which can be adapted by the addition of various additives.
The aim of the thesis proposed by Eurenco, the world leader in "Getane lmprovers", in collaboration with the PRISME laboratory at the University of Orléans, is to study the impact of nitrogen-based additives on the ignition of ethanol, methanol, and ammonia. This experimental work, using a rapid compression machine, a high-pressure-high-temperature chamber, and single-cylinder research engines, aims to improve the understanding and prediction of the oxidation process of these fuels, and to validate kinetic and physical models.

Mots-clés : Moteurs thermiques, hydrogène, jets sous-détendus, LES, combustion