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COBEM 2017
24th ABCM International Congress of Mechanical Engineering
EFFECT OF AIR-FUEL RATIO ON SYNGAS COMBUSTION IN AN OPTICALLY ACCESSIBLE SPARK IGNITION ENGINE
Submission Author:
santiago daniel martinez boggio , Montevideo , Uruguay
Co-Authors:
santiago daniel martinez boggio, Pedro Lacava, Maycon Silva, SIMONA MEROLA, Adrian Irimescu, Pedro Curto-Risso
Presenter: santiago daniel martinez boggio
doi://10.26678/ABCM.COBEM2017.COB17-0706
Abstract
Biomass gasification converts a solid fuel into a gaseous mixture (Syngas) which can be burnt in reciprocating internal combustion engines (ICE). The introduction of new policies, aimed at reducing the green-house gases emissions and the dependence of fossil fuels, promotes the use of alternative fuels in both transportation and power generation. To this aim, the paper presents an experimental investigations performed to study the effect of air-fuel ratio on the combustion process in a port fuel injection spark-ignition engine fueled with an equivalent Syngas mixture. Methane was considered as baseline fuel. The in-cylinder pressure and the related parameters were analyzed as indicators of the combustion behavior. 2-D digital cycle resolved imaging measurements were performed to evaluate the flame propagation. The engine was operated at fixed rotational speed (900 rev/min) at wide open throttle. The excess air ratio was raised from 1.0 to 1.4 (close to the flammability limit of methane) and spark timing was adopted according to the maximum brake torque of the baseline fuel to compare the different cases in the same fluid dynamic conditions at ignition. Cycle-to-cycle variability was below 4% for both fuels and air fuel ratios tested, indicating a stable combustion process. However Syngas mixtures allowed more stable engine operation at the lean burn limit than Methane showing a significant decrease in the coefficient of variation measured for the IMEP. Finally, a decrease of the combustion duration for Syngas was observed as consequence of hydrogen content.
Keywords
Combustion, S. I. ENGINE, Syngas, methane/air flame, Flame Visualization
