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An investigation on the potential of dedicated exhaust gas recirculation for improving thermal efficiency of stoichiometric and lean spark ignition engine operation

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  • Jung, Dongwon
  • Lee, Sejun

Abstract

To suppress knock for improving thermal efficiency (ηth) of spark ignition (SI) engines, external exhaust gas recirculation (EGR) has been used. However, the use of EGR reduces flame speed, which leads to observed increase of cycle-to-cycle variations of SI combustion. To overcome this problem by reforming the fuel to add reactive compounds such as H2 and CO to the intake charge, dedicated EGR (D-EGR) concept is proposed, which uses a portion of the cylinders of a multi-cylinder engine to produce the entirety of the EGR consisted mainly of H2 and CO. To maximize the potential of D-EGR and provide new insights for improving ηth of SI engines, this study computationally investigates the use of D-EGR over a wide range of fuel-air equivalence ratios in four-cylinder engine (one D-EGR cylinder and three normal cylinders) for stoichiometric and lean operation. For the computations of laminar burning velocity (SL) and burned gas temperature (Tb), PREMIX in CHEMKIN-PRO were conducted with GRI-Mech 3.0 which is a detailed chemical-kinetic mechanism for methane (CH4).

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  • Jung, Dongwon & Lee, Sejun, 2018. "An investigation on the potential of dedicated exhaust gas recirculation for improving thermal efficiency of stoichiometric and lean spark ignition engine operation," Applied Energy, Elsevier, vol. 228(C), pages 1754-1766.
    • Handle: RePEc:eee:appene:v:228:y:2018:i:c:p:1754-1766
    DOI: 10.1016/j.apenergy.2018.07.066
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    References listed on IDEAS

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    Cited by:

    1. Nguyen Xuan Khoa & Ocktaeck Lim, 2022. "A Review of the External and Internal Residual Exhaust Gas in the Internal Combustion Engine," Energies, MDPI, vol. 15(3), pages 1-21, February.
    2. Huang, Shuai & Li, Tie & Zhang, Zhifei & Ma, Pengfei, 2019. "Rotational and vibrational temperatures in the spark plasma by various discharge energies and strategies," Applied Energy, Elsevier, vol. 251(C), pages 1-1.
    3. Feng, Hongqing & Suo, Xinghan & Xiao, Shuwen & Chen, Xiaofan & Zhang, Zhisong & Gao, Ning & Zheng, Zunqing, 2023. "Numerical simulation on the effects of n-butanol combined with intake dilution on engine knock," Energy, Elsevier, vol. 271(C).
    4. Khoa, Nguyen Xuan & Quach Nhu, Y. & Lim, Ocktaeck, 2020. "Estimation of parameters affected in internal exhaust residual gases recirculation and the influence of exhaust residual gas on performance and emission of a spark ignition engine," Applied Energy, Elsevier, vol. 278(C).

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