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Numerical investigation of natural gas feasibility in a direct injection heavy-duty diesel engine

In the present study, numerical simulations were performed on a direct injection heavy-duty diesel engine. Methane, which is the predominant component in natural gas, was chosen as the fuel. The simulations involved five exhaust gas recirculation ratios (0%, 10%, 20%, 25%, and 30%) to examine their effect on engine performance, NOx, and soot emissions. The numerical results were compared with existing experimental measurements of a typical diesel engine without exhaust gas recirculation. A comparison of the numerical results of the four cases of exhaust gas recirculation ratios reveals that the 30% exhaust gas recirculation ratio achieves a significant reduction in NOx emissions without increasing soot emissions. Consequently, the engine meets the authorized emission standards without excessive performance degradation.
PAPER REVISED: 2024-05-09
PAPER ACCEPTED: 2024-05-14
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