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The influence of Exhaust Gas Recirculation (EGR) on combustion and emissions of n-heptane/natural gas fueled Homogeneous Charge Compression Ignition (HCCI) engines

Author

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  • Fathi, Morteza
  • Saray, R. Khoshbakhti
  • Checkel, M. David

Abstract

In Homogeneous Charge Compression Ignition (HCCI) combustion, a lean premixed charge combusts simultaneously in multiple sites. Utilizing highly diluted mixtures, and lack of any significant flame propagation, in-cylinder NOx formation is reduced. Making HCCI engine a feasible alternative to conventional engines requires several challenges to be resolved. Combustion timing control is one of the most important of these items. It should be done in order that heat is released at the most optimum phasing for efficiency and emissions. In this study, a Waukesha Cooperative Fuel Research (CFR) single cylinder research engine was used to be operated in HCCI combustion mode fueled by natural gas and n-heptane. The main goal of the experiments was to investigate the possibility of controlling combustion phasing and combustion duration using various Exhaust Gas Recirculation (EGR) fractions. For the analysis of the results, a modified apparent heat release model was developed. The influence of EGR on emissions was discussed. Results indicate that applying EGR reduces mean charge temperature and has profound effect on combustion phasing, leading to a retarded Start of Combustion (SOC) and prolonged burn duration. Heat transfer rate decreases with EGR addition. Under examined condition EGR addition improved fuel economy, reduced NOx emissions and increased HC and CO emissions.

Suggested Citation

  • Fathi, Morteza & Saray, R. Khoshbakhti & Checkel, M. David, 2011. "The influence of Exhaust Gas Recirculation (EGR) on combustion and emissions of n-heptane/natural gas fueled Homogeneous Charge Compression Ignition (HCCI) engines," Applied Energy, Elsevier, vol. 88(12), pages 4719-4724.
    • Handle: RePEc:eee:appene:v:88:y:2011:i:12:p:4719-4724
    DOI: 10.1016/j.apenergy.2011.06.017
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    References listed on IDEAS

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    1. Gan, Suyin & Ng, Hoon Kiat & Pang, Kar Mun, 2011. "Homogeneous Charge Compression Ignition (HCCI) combustion: Implementation and effects on pollutants in direct injection diesel engines," Applied Energy, Elsevier, vol. 88(3), pages 559-567, March.
    2. Machrafi, Hatim & Cavadias, Simeon & Amouroux, Jacques, 2008. "A parametric study on the emissions from an HCCI alternative combustion engine resulting from the auto-ignition of primary reference fuels," Applied Energy, Elsevier, vol. 85(8), pages 755-764, August.
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