Simulating and Validating a multi-zone thermodynamic-model for gasoline-NG dual-fuel SI engines and predicting NO emission

Today, with the help of simulation models, engine performance can be modelled with a high level of precision, and thereby various strategies for the improvement of engine performance including the use of dual-fuel mixtures can be investigated. In the present study, a multi-zone thermodynamic simulation-code in Gasoline-Natural Gas (NG) mode with a Blow-by sub-model and a NO predicting-mechanism was developed. Then using a single-cylinder research-engine, experimental data were collected from various cycles via the use of skip < /span>-fire technique at the compression ratio of 10 for the dual-fuel mixtures of 100%, 90%, 75% and 60% Gasoline and the rest NG. From the obtained experimental data, two 200-cycle series of motoring and combustion without residual-gases were provided to verify the simulation code. In the motoring mode, the results of the simulating code equipped with Blow-by sub-model were compared with the experimental results. Then in the combustion mode, the results of the simulation code were compared with the average of pressure-crank angle experimental data in each dual-fuel mode. The performance of the simulation code was confirmed with an error of less than 4%. Finally, the sub-model for the prediction of NO emission revealed that NO emission decreased with the increase of NG fraction.