Numerical Investigation of the Turbulent Flame Propagation in Dual Fuel Engines by Means of Large Eddy Simulation
نویسندگان
چکیده
Dual fuel combustion depicts a possible alternative to reduce emissions from large engines and is characterized by injecting small amount of diesel into lean natural gas–air mixture. Thereby, the presence autoignition, diffusive premixed determine high complexity this process. In work, an Extended Coherent Flame Model was adapted consider effect gas on ignition delay time. This model afterward utilized simulate 25 consecutive engine cycles employing LES. framework, ensemble-average flow field compared RANS solution assess advantages LES in terms prediction in-cylinder field. A detailed investigation heat release characteristic showed that already highly contributes at beginning combustion. Furthermore, methodology investigate turbulent regimes utilized. It could be ascertained mainly occurs regime thin reaction zones. Possible triggers cycle-to-cycle variations were determined velocity fluctuations cylinder axis direction flame formation gaps between spray plume. The findings support understanding dual serve as basis for developing future models.
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ژورنال
عنوان ژورنال: Energies
سال: 2021
ISSN: ['1996-1073']
DOI: https://doi.org/10.3390/en14165036