Abstract
A 0.745 L 2-cylinder spark-ignition engine was operated with compressed natural gas and with simulated landfill gas (60% CH 4 and 40% CO 2 by volume) containing hydrogen concentrations of 0, 30%, 40%, and 50% (by volume of the CH 4 in the fuel) at constant rpm. This empirical data was compared with predictions from three existing semi-empirical engine models, using a first-law-based finite heat release model to correlate measured in-cylinder pressure data and burn rate for each fuel mixture. Of the three models only a two zone model incorporating thermal and prompt NO x came within 25% of predicting the measured NO x emissions.
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