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The effects of unburned hydrocarbon recirculation on ignition and combustion during diesel engine cold starts

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  • Cui, Yi
  • Peng, Haiyong
  • Deng, Kangyao
  • Shi, Lei

Abstract

The exhaust gases contain large amounts of unburned hydrocarbons during cranking without combustion. The effects of unburned hydrocarbon recirculation on ignition and combustion during diesel engine cold starts were investigated using both experiments and simulations. Experiments were conducted on a single-cylinder DI (direct injection) diesel engine equipped with a common rail injection system. The amount of unburned hydrocarbon recirculation was jointly controlled by an EGR (exhaust gas recirculation) valve and a back pressure valve. The investigation showed that optimal opening of recirculation control valves allowed the first firing cycle to be advanced from 19 to 6 and reduced the duration of heavy smoke emission (opacity > 50%) by 77%. However, the enhancement to the in-cylinder LTR (low temperature reaction) decreased gradually as the amount of unburned hydrocarbon recirculation increased. An analysis of the chemical kinetics showed that the reaction intermediates present in unburned hydrocarbons, such as ketohydroperoxides, were the most significant factor in enhancing the LTR during non-firing cycles. At the same time, the substantial heat capacity of unburned hydrocarbons suppressed the LTR for higher recirculation rates.

Suggested Citation

  • Cui, Yi & Peng, Haiyong & Deng, Kangyao & Shi, Lei, 2014. "The effects of unburned hydrocarbon recirculation on ignition and combustion during diesel engine cold starts," Energy, Elsevier, vol. 64(C), pages 323-329.
    • Handle: RePEc:eee:energy:v:64:y:2014:i:c:p:323-329
    DOI: 10.1016/j.energy.2013.10.083
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    References listed on IDEAS

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    1. Maiboom, Alain & Tauzia, Xavier & Hétet, Jean-François, 2008. "Experimental study of various effects of exhaust gas recirculation (EGR) on combustion and emissions of an automotive direct injection diesel engine," Energy, Elsevier, vol. 33(1), pages 22-34.
    2. Jia, Ming & Li, Yaopeng & Xie, Maozhao & Wang, Tianyou, 2013. "Numerical evaluation of the potential of late intake valve closing strategy for diesel PCCI (premixed charge compression ignition) engine in a wide speed and load range," Energy, Elsevier, vol. 51(C), pages 203-215.
    3. Feng, Hongqing & Zheng, Zunqing & Yao, Mingfa & Cheng, Gang & Wang, Meiying & Wang, Xin, 2013. "Effects of exhaust gas recirculation on low temperature combustion using wide distillation range diesel," Energy, Elsevier, vol. 51(C), pages 291-296.
    4. Pastor, J.V. & Bermúdez, V. & García-Oliver, J.M. & Ramírez-Hernández, J.G., 2011. "Influence of spray-glow plug configuration on cold start combustion for high-speed direct injection diesel engines," Energy, Elsevier, vol. 36(9), pages 5486-5496.
    5. Peng, Haiyong & Cui, Yi & Shi, Lei & Deng, Kangyao, 2008. "Effects of exhaust gas recirculation (EGR) on combustion and emissions during cold start of direct injection (DI) diesel engine," Energy, Elsevier, vol. 33(3), pages 471-479.
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