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The effect of applying the exhaust gas recirculation technique on the performance of a free-piston engine, including the resulting emissions, is introduced and assessed in this study. The simulation process has been performed over a single-cylinder, two-stroke free-piston engine that uses a homogeneous charge compression ignition. Two main sub-models that work implicitly to simulate the engine performance and emissions in an iterative simulation procedure using MATLAB® and Cantera toolbox. It was found that recycling a small percentage of the exhaust gases (∼10%) has a significant effect on reducing the engine emissions, like the NOxlevels. Four different levels of EGR were applied in the simulations at,,and. Raising the percentage of the recirculated gases beyond a specific threshold will encounter a negative outcome by increasing the emissions of other particles, such as the UHC and CO. Moreover, it can lower the oxygen (O 2 ) concentrations causing an incomplete fuel–air burning which reduces the combustion efficiency. The recirculation of 30% of the exhaust gases was aggressively able to reduce about 14 g/kWh of NOxat the ignition time compared to no recirculation, and about 8 g/kWh at the steady state.

international journal of ambient energy

Numerical investigation of combustion characteristics of a single-cylinder linear engine fueled by natural gas under the influence of exhaust gas recirculation