<p>In the present work, a closed-cycle, 3-D computational fluid dynamics (CFD) analysis campaign was conducted to evaluate the performance of using spark plug to assist gasoline compression ignition (GCI) combustion during cold idle operation. A conventional single-sided J-strap spark plug was put at a location on the cylinder head to facilitate spray-guided spark assistance. Ignition was modeled with an L-type energy distribution to account for the breakdown and the arc/glow phases during the energy discharge process. Several key deign parameters were&nbsp; investigated, including injector clocking, number of nozzle holes, spray inclusion angle, number of fuel injections, fuel split ratio, and fuel injection timings. Particular emphasis was placed in the region around spark gap, focusing on flame kernel development, local flow field, and fuel-air mixture formation. The flame kernel development and ignition process were found to correlate strongly with the fuel stratification and the flow velocity near the spark gap. The analysis results showed that the flame kernel development followed the direction of local flow field. In addition, the early-stage flame kernel development was notably influenced by the local fuel stratification due to the varying injection spray patterns and the fuel injection strategies. Among these design parameters, number of nozzle holes and fuel split ratio had the most significant effects on the engine combustion performance.</p>

Cfd-Guided Evaluation of Spark-Assisted Gasoline Compression Ignition for Cold Idle Operation

Paper Proceedings: https://asmedigitalcollection.asme.org/ICEF/ICEF2021/volume/85512

ASME 2021 Internal Combustion Engine Division Fall Technical Conference (ICEF2021)

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