Optical analysis of the combustion of potential future E-Fuels with a high pressure dual fuel injection system

Due to efforts to mitigate global climate change, decarbonization is nowadays a key driver in energy technology and the development of mobile powertrains. Especially for applications where large amounts of energy have to be stored (e.g. trucks, off-road applications, or shipping), energy storage using synthetic fuels produced from renewable electricity and eventually carbon sequestered from the atmosphere are a promising option. The "High Pressure Duel Fuel" (HPDF) combustion process is a promising way to use often discussed e-fuels such as hydrogen, methane or methanol in large engines. With HPDF combustion, the main (E-) fuel is injected with high pressure (300…500bar) at the end of the compression stroke, and ignited by the combustion products of a small diesel pilot injection that occurs typically slightly before the main fuel injection. Compared to premixed combustion systems, mixing-controlled combustion has the advantage of a very good controllability of the combustion of a wide range of fuels. In addition, the slip of unburned fuel due to the absence of fuel in the fire land or quenching zones near the walls is significantly reduced. This is especially relevant when methane is used as fuel, as emissions of unburned methane contribute with a factor of 28 (on a 100-year-basis) to global warming compared to CO2. In this work, HPDF combustion of the above-mentioned fuels is investigated at high loads (IMEP > 22 bar) on a fully optically accessible single-cylinder research engine with a displacement of 4.8 liters.     «

Due to efforts to mitigate global climate change, decarbonization is nowadays a key driver in energy technology and the development of mobile powertrains. Especially for applications where large amounts of energy have to be stored (e.g. trucks, off-road applications, or shipping), energy storage using synthetic fuels produced from renewable electricity and eventually carbon sequestered from the atmosphere are a promising option. The "High Pressure Duel Fuel" (HPDF) combustion process is a promis...     »