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Effect of Stratified Charge Combustion Chamber Design on Natural Gas Engine Performance

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  • Mehmet Cakir

    (Department of Marine Engineering Operations, Yildiz Technical University, Istanbul 34349, Türkiye)

Abstract

This study investigates the performance and combustion behavior of a spark ignition engine retrofitted to operate on compressed natural gas (CNG), with a focus on a newly developed stratified charge pre-chamber design. The engine was modified to include an auxiliary intake valve that enables partial enrichment of the pre-chamber mixture without the need for a dedicated fuel injector. This hybrid approach combines the mechanical simplicity of passive systems with the enhanced combustion control of active pre-chambers. Both experimental tests and computational fluid dynamics (CFD) analyses were carried out under partial load conditions (8 Nm) and engine speeds ranging from 900 to 1700 rpm. The results demonstrate improvements in indicated mean effective pressure (IMEP), combustion stability, and flame propagation speed—particularly at lower engine speeds where stratified combustion effects are more pronounced. However, increasing engine speed resulted in reduced volumetric efficiency and elevated exhaust temperatures, indicating potential for further optimization via turbocharging or advanced scavenging techniques. Overall, the findings validate the effectiveness of the proposed design in enhancing thermal efficiency and ignition stability in CNG-fueled engines, especially under urban driving conditions.

Suggested Citation

  • Mehmet Cakir, 2025. "Effect of Stratified Charge Combustion Chamber Design on Natural Gas Engine Performance," Energies, MDPI, vol. 18(9), pages 1-14, April.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:9:p:2187-:d:1642030
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    References listed on IDEAS

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    1. Roso, Vinícius Rückert & Santos, Nathália Duarte Souza Alvarenga & Valle, Ramon Molina & Alvarez, Carlos Eduardo Castilla & Monsalve-Serrano, Javier & García, Antonio, 2019. "Evaluation of a stratified prechamber ignition concept for vehicular applications in real world and standardized driving cycles," Applied Energy, Elsevier, vol. 254(C).
    2. Yousefi, Amin & Birouk, Madjid, 2017. "Investigation of natural gas energy fraction and injection timing on the performance and emissions of a dual-fuel engine with pre-combustion chamber under low engine load," Applied Energy, Elsevier, vol. 189(C), pages 492-505.
    3. Benajes, J. & Novella, R. & Gomez-Soriano, J. & Martinez-Hernandiz, P.J. & Libert, C. & Dabiri, M., 2019. "Evaluation of the passive pre-chamber ignition concept for future high compression ratio turbocharged spark-ignition engines," Applied Energy, Elsevier, vol. 248(C), pages 576-588.
    4. Paolo Sementa & Cinzia Tornatore & Francesco Catapano & Silvana Di Iorio & Bianca Maria Vaglieco, 2023. "Custom-Designed Pre-Chamber: Investigating the Effects on Small SI Engine in Active and Passive Modes," Energies, MDPI, vol. 16(13), pages 1-24, July.
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