Energy and exergy analyses of skipped cycle mode in a single-cylinder engine fuelled with diesel and natural gas

摘要

In this study, performance and exhaust emissions were examined experimentally at different engine loads (25, 50, and 75) at a constant speed of 1,500 rpm using pure diesel before modifications and pure natural gas (NG100) after modifications. Furthermore, experimental studies were conducted under 2 normal-1 skipped cycle (2N1S) and 3 normal-1 skipped cycle (3N1S) conditions using pure natural gas as a fuel in a converted spark-ignition engine. In the present study, energy and exergy analyses were performed using the performance and exhaust emission values obtained from experiments. As a result of the energy analysis, effective thermal efficiency values of 39.46 and 34.37 were found in diesel and natural gas fuels, respectively, at an engine load of 75 without cycle skipping. It was observed that the effective thermal efficiency value reached the maximum value of 35.99 in case of cycle skipping in natural gas and at an engine load of 50.