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

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Title: Effect of Stratified Charge Combustion Chamber Design on Natural Gas Engine Performance.
Authors: Cakir, Mehmet1 (AUTHOR)
Source: Energies (19961073). May2025, Vol. 18 Issue 9, p2187. 14p.
Subjects: Compressed natural gas, Isothermal efficiency, Thermal efficiency, Combustion chambers, Computational fluid dynamics, Spark ignition engines
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. [ABSTRACT FROM AUTHOR]
Copyright of Energies (19961073) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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PubType: Academic Journal
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  Data: Effect of Stratified Charge Combustion Chamber Design on Natural Gas Engine Performance.
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  Data: <searchLink fieldCode="AR" term="%22Cakir%2C+Mehmet%22">Cakir, Mehmet</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. May2025, Vol. 18 Issue 9, p2187. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Compressed+natural+gas%22">Compressed natural gas</searchLink><br /><searchLink fieldCode="DE" term="%22Isothermal+efficiency%22">Isothermal efficiency</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+efficiency%22">Thermal efficiency</searchLink><br /><searchLink fieldCode="DE" term="%22Combustion+chambers%22">Combustion chambers</searchLink><br /><searchLink fieldCode="DE" term="%22Computational+fluid+dynamics%22">Computational fluid dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Spark+ignition+engines%22">Spark ignition engines</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Energies (19961073) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/en18092187
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      – Code: eng
        Text: English
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        PageCount: 14
        StartPage: 2187
    Subjects:
      – SubjectFull: Compressed natural gas
        Type: general
      – SubjectFull: Isothermal efficiency
        Type: general
      – SubjectFull: Thermal efficiency
        Type: general
      – SubjectFull: Combustion chambers
        Type: general
      – SubjectFull: Computational fluid dynamics
        Type: general
      – SubjectFull: Spark ignition engines
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      – TitleFull: Effect of Stratified Charge Combustion Chamber Design on Natural Gas Engine Performance.
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              M: 05
              Text: May2025
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              Y: 2025
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            – TitleFull: Energies (19961073)
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