Single and double Wiebe functions, analytical equations that estimate the fuel mass fraction burned (MFB) during combustion, have been effective at describing the combustion process in spark-ignition (SI) engines using gasolione fuels. This study focuses on exploring if the same methodology can be extended for SI combustion with syngas and anode-off gas. Syngas, a gaseous fuel mixture composed of H2, CO and CO2, has the potential to reduce engine-out exhaust emissions at very lean operating conditions compared to convential fossil fuels.&nbsp; Syngas can also extend the lean misfire limit in spark-ignition engines. Anode-off gas is a gaseous fuel that is exhausted from the anode of a Solid Oxide Fuel Cell (SOFC), which contains H2, CO, H2O, and CO2. Anode off-gas can be treated as a syngas fuel diluted with CO2 and vaporized water.&nbsp; In this paper, an experimental study of using syngas and anode-off gas as fuel on a single-cylinder Cooperative Fuel Research (CFR) spark ignition engine was conducted.&nbsp; One single Wiebe function and three double Wiebe functions were fitted and compared with the MFB profile calculated from the experimental data. It was determined that the SI combustion process of both the syngas and the anode-off gas could be estimated using a unique Wiebe function. While the detailed double Wiebe function had the highest accuracy, a reduced double Wiebe function is capable of achieving comparable accuracy. On the other hand, the single Wiebe function is not able to fully capture the combustion process of a SI engine using syngas and anode off-gas.

Estimation of Wiebe Function Parameters for Syngas and Anode Off-Gas Combustion in Spark-Ignition Engines

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

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

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