Energy and exergy analysis of a cycle‑skipping strategy in an HCCI engine fueled with natural gas

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dc.authorid0000-0002-5212-0966
dc.authorid0000-0001-5542-4853
dc.authorid0000-0002-2660-8386
dc.contributor.authorAtak, Nisa Nur
dc.contributor.authorTunçer, Erdal
dc.contributor.authorDoğan, Battal
dc.contributor.authorÜnal, Kenan
dc.date.accessioned2025-09-16T07:15:39Z
dc.date.available2025-09-16T07:15:39Z
dc.date.issued2025
dc.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Makine Mühendisliği Bölümü
dc.description.abstractHomogeneous charge compression ignition (HCCI) engines have attracted considerable interest due to its incorporation of features from both gasoline and diesel engines. In this study, the effects of cycle-skipping strategies on engine perfor mance, efficiency, and emissions in a natural gas-fired HCCI engine were investigated experimentally. Experiments were conducted under constant engine speed, at 25, 50, and 75% load levels, in the Normal, 3 Normal-1 Skip (3N1S), 2 Normal-1 Skip (2N1S), and 1 Normal-1 Skip (1N1S) cycle modes. Emissions, fuel consumption, energy–exergy flow, thermal losses, irreversibilities, entropy generation, thermal, and exergy efficiencies were calculated based on the experimental data. Under 50% engine load, the NOx emission in the 3N1S operating mode was measured at 1594 ppm, whereas it increased by 52.5% to 2431 ppm in the 2N1S mode. The correlation between cycle-skipping tactics and thermal efficiency was determined to be contingent upon engine load. In Normal and 3N1S modes, thermal efficiency generally improves with elevated engine loads, while the 2N1S and 1N1S modes provide superior performance at low to medium loads. At a constant 50% load, heat effi ciency in the 2N1S mode increased by 7.84% to reach 28.34% compared to the Normal mode. Additionally, thermodynamic analyses revealed that the 1N1S mode has the lowest entropy generation and the least irreversibility, at 0.021 kW/K. These results demonstrate that cycle-skipping strategies can be an effective tool for optimizing engine performance based on load.
dc.identifier.citationAtak, N. N., Tunçer, E., Doğan, B., Ünal, K. (2025). Energy and exergy analysis of a cycle‑skipping strategy in an HCCI engine fueled with natural gas. Journal of Thermal Analysis and Calorimetry, https://doi.org/10.1007/s10973-025-14691-x
dc.identifier.doi10.1007/s10973-025-14691-x
dc.identifier.issn1588-2926
dc.identifier.issn1388-6150
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1007/s10973-025-14691-x
dc.identifier.urihttps://hdl.handle.net/20.500.13055/1108
dc.identifier.wosWOS:001564965700001
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.indekslendigikaynak.otherSCI-E - Science Citation Index Expanded
dc.institutionauthorTunçer, Erdal
dc.institutionauthorid0000-0002-5212-0966
dc.language.isoen
dc.publisherSpringer Nature Link
dc.relation.ispartofJournal of Thermal Analysis and Calorimetry
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectCycle Skipping
dc.subjectHCCI
dc.subjectNatural Gas
dc.subjectEnergy
dc.subjectExergy
dc.titleEnergy and exergy analysis of a cycle‑skipping strategy in an HCCI engine fueled with natural gas
dc.typeArticle
dspace.entity.typePublication

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