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

Authors: Erdal Tunçer; Battal Doğan; Tarkan Sandalcı; Derviş Erol

Addresses: Erin Engine Corporation Inc., Department of Research and Development, Istanbul, 34517, Turkey ' Department of Energy Systems Engineering, Faculty of Technology, Gazi University, Ankara, 06500, Turkey ' Automotive Division, Department of Mechanical Engineering, Yıldız Technical University, Istanbul, 34349, Turkey ' Department of Automotive Technology, Kırıkkale Vocational School, Kırıkkale University, Kırıkkale, 71450, Turkey

Abstract: 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%.

Keywords: natural gas; skipped cycle; pollutant emissions; energy analysis; exergy analysis.

DOI: 10.1504/IJEX.2022.125523

International Journal of Exergy, 2022 Vol.39 No.2, pp.173 - 194

Received: 23 Jul 2021
Accepted: 08 Jan 2022

Published online: 13 Sep 2022 *

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