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Impact of hydrogen blending on the cyclic variability of an EGR diluted methanol SI engine

Spira, Maxime ; Morineau, Bastien
(2022)

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Morineau_45451700_Spira_21711600_2022.pdf
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Details

Supervisors
Jeanmart, Hervé ; Contino, Francesco
Faculty
Ecole polytechnique de Louvain
Degree label
Master [120] : ingénieur civil mécanicien, à finalité spécialisée
Abstract
In the climate crisis context, reducing Green House Gas emissions is of paramount importance. "Green Deal" was signed in Europe, imposing a 100% reduction in GHGs by 2035. This is the equivalent of a ban on all internal combustion engines. This decision will be re-evaluated in 2026, and electrofuels could be part of the balance. One of the most promising is methanol. Compared to other electrofuels such as hydrogen, methanol remains liquid at Standard Temperature and Pressure, making its storage practical. The present work addresses the use of methanol in Spark Ignition engines. Its use in parallel with Exhaust Gas Recirculation for Nitrous Oxides reduction is studied. With large fractions of EGR, combustion stability deteriorates. The introduction of hydrogen blending as a means to stabilize combustion is then also investigated. A test bench is modified, and a complete fuel line is implemented for this purpose. The experimental results showed that the IMEP and IE decrease slightly with EGR with pure methanol while they increase with the hydrogen/methanol mixture. An increase in IE from 33 to 37.3% is noticed for the largest EGR condition. The addition of hydrogen shortens the flame development and propagation times under EGR. Increasing the EGR fraction decreases the maximum in-cylinder temperature in both cases, demonstrating that EGR can effectively control NOx emissions in a hydrogen/methanol mixture. The cyclic variability with EGR was drastically reduced with the introduction of hydrogen, for a decrease from 7.8 to 3.6% in the highest diluted case.