Browsing by Author "Alarcon Astudillo, Jose Alfredo"

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    Numerical study of Ammonia/Diesel combustion in Heavy-duty Internal combustion
    (2025) Alarcon Astudillo, Jose Alfredo; Jahn von Arnswaldt, Wolfram Michael Oliver; Walczak, Magdalena; Pontificia Universidad Católica de Chile. Escuela de Ingeniería
    As demand for low-carbon alternatives in heavy-duty transport grows, ammonia becomes a suitable alternative which can be produced via renewable energies. This study investigates the application of ammonia-diesel dual-fuel combustion in a mining haul truck engine using CONVERGE CFD. Simulations were performed at various ammonia energy replacement (AER) ratios, from 0% to 70%, to determine impacts in emissions and performance. As expected, results indicate that an increase in AER reduces CO2 and NOx emissions across the board, by up to 71% and 97%, respectively. On the other hand, the increase in N2O emissions actually increases the total carbon-equivalent footprint of the engine in all AER levels, while NH3 emissions rise past safe levels from 40% AER onwards. Engine power, as measured by Indicated Mean Effective Pressure (IMEP) increases slightly and reaches a maximum at 50% AER, after which it is reduced. Finally, the combustion event is delayed and lengthened, which can be attributed to the low burning velocity of ammonia. Strategies aimed at lowering N2O emissions such as exhaust gas recirculation or cylinder temperature control are proposed as methods that can further expand on the benefits of replacing fossil fuels with ammonia. Results are validated by comparing the 0% AER case with engine performance data, showing close agreement with engine performance, although differences remain in specific emissions levels. Nevertheless, since the step-by-step trends agree with what is observed in literature, they areassumed to be representative of reality, even if the specific values are not.