<p class="MsoNormal" style="text-align: justify; line-height: 150%">Gasoline compression ignition (GCI) is a promising way to achieve high thermal efficiency and low emissions with a conventional diesel engine hardware. It is a partially premixed combustion concept which derives its superiority from good volatility and long ignition delay of gasoline-like fuels. The present study investigates the interaction between the piston bowl and the spray plume of a compression ignition engine that operates on a late fuel injection strategy using computational fluid dynamics (CFD) analysis. Simulations were carried out on a single cylinder of a multi cylinder heavy duty compression ignition engine. In-cylinder turbulence was modelled using RNG k-ε model and the fuel spray break up was modelled using KH-RT model. Reduced chemical kinetic mechanism was used to model combustion chemistry. In this study, a late fuel injection strategy is used because it is less sensitive to combustion kinetics compared to early injection strategies. After validating the combustion and performance characteristics of the baseline piston with the experimental results several new piston bowl designs were generated using CAESES. Full cycle engine simulations were carried out with new piston bowl designs. The results compare the spray-bowl interaction of the new piston bowl designs with the baseline design. The impact of spray-bowl interaction on thermal efficiency of the engine is investigated.</p>

Numerical Investigation of the Impact of Spray – Bowl Interaction on Thermal Efficiency of a Gasoline Compression Ignition Engine

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

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

Supporting the need among researchers worldwide for additional online and multimedia content, ASME now offers the ASME Conference Video Collection. This platform will collect and provide long-term access to conference presentation videos, encompassing all technology areas within ASME's technical conference and events program. About 30,000-40,000 engineers across all mechanical engineering and related disciplines participate in ASME conferences each year. This includes authors of approximately 6,000 to 8,000 technical papers published by ASME, the majority of whom also submit video presentations for our virtual conferences. The video collection will be available as an add-on to existing product packages or as a separate subscription.