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

Tuncer E., Doğan B., Sandalcı T., Erol D.

INTERNATIONAL JOURNAL OF EXERGY, vol.39, no.2, pp.173-194, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 39 Issue: 2
  • Publication Date: 2022
  • Doi Number: 10.1504/ijex.2022.125523
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.173-194
  • Keywords: natural gas, skipped cycle, pollutant emissions, energy analysis, exergy analysis, SPARK-IGNITION ENGINES, COMBUSTION, INJECTION, PERFORMANCE, STRATEGIES, CNG, EMISSIONS
  • Yıldız Technical University Affiliated: Yes


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%.