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首页> 外文期刊>Energy Conversion & Management >Experimental and numerical investigation of the effects of low-pressure, high-pressure and internal EGR configurations on the performance, combustion and emission characteristics in a hydrogen-enriched heavy-duty lean-burn natural gas SI engine
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Experimental and numerical investigation of the effects of low-pressure, high-pressure and internal EGR configurations on the performance, combustion and emission characteristics in a hydrogen-enriched heavy-duty lean-burn natural gas SI engine

机译：低压，高压和内部EGR配置对富氢重型稀燃天然气SI发动机性能，燃烧和排放特性影响的实验和数值研究

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摘要

In this study, a detailed 1D simulation model of the hydrogen-enriched natural gas SI engine was built according to realistic engine layout in the lab with practical boundary conditions, and validated against the experimental data. Four different types of EGR systems were comprehensively investigated, including a low-pressure (LP) EGR, a high-pressure (HP) EGR, their combinations, and an internal EGR, using the validated 1D simulation model of the hydrogen-enriched natural gas SI engine for their combustion, performance, and emissions characteristics. The results indicated that the peak combustion pressure of the in-cylinder pressure decreased with increase in EGR ratio either using the HP, LP, or combined HP-LP systems. The NOx emissions with the HP EGR were observed to be lowest of all types of EGR systems. Combined the 10% HP EGR ratio with the 5% LP EGR ratio (total 15% EGR ratio) was predicted to achieve the highest indicated thermal efficiency compared with other EGR strategies. As for the internal EGR, the peak combustion pressure and the heat release rate slightly increased with decrease in the valve overlap. Moreover, the indicated thermal efficiency firstly increased with decrease in overlap and then slightly declined. The internal EGR was mainly determined by the timing of the exhaust valve closing; However, it was not the only influence factor. The positive and negative waves in the intake and exhaust systems also played a crucial role in the gas exchange process and volumetric efficiency.
机译：在这项研究中，根据实验室中的实际发动机布局并结合实际边界条件，建立了详细的一维富氢天然气SI发动机一维模拟模型，并针对实验数据进行了验证。使用经过验证的富氢天然气一维模拟模型，对四种不同类型的EGR系统进行了全面研究，包括低压（LP）EGR，高压（HP）EGR，它们的组合以及内部EGR。 SI发动机具有燃烧，性能和排放特性。结果表明，使用HP，LP或组合HP-LP系统时，缸内压力的峰值燃烧压力随着EGR率的增加而降低。在所有类型的EGR系统中，HP EGR的NOx排放量最低。与其他EGR策略相比，预计将10％HP EGR比率与5％LP EGR比率（总15％EGR比率）相结合将实现最高的指示热效率。至于内部EGR，峰值燃烧压力和放热率随着气门重叠的减少而略有增加。此外，指示的热效率首先随着重叠的减少而增加，然后略有下降。内部EGR主要由排气门关闭正时决定；但是，它不是唯一的影响因素。进气和排气系统中的正负波在气体交换过程和容积效率中也起着至关重要的作用。

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  • 来源
    《Energy Conversion & Management》 |2019年第9期|1319-1333|共15页
  • 作者

    Duan Xiongbo; Liu Yiqun; Liu Jingping; Lai Ming-Chia; Jansons Marcis; Guo Genmiao; Zhang Shiheng; Tang Qijun;

  • 作者单位

    Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China|Wayne State Univ, Dept Mech Engn, Detroit, MI 48202 USA;

    Wayne State Univ, Dept Mech Engn, Detroit, MI 48202 USA;

    Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China;

    Wayne State Univ, Dept Mech Engn, Detroit, MI 48202 USA;

    Wayne State Univ, Dept Mech Engn, Detroit, MI 48202 USA;

    Jiangsu Univ, Sch Energy & Power Engn, Zhenjiang 212013, Jiangsu, Peoples R China;

    Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China;

    Hunan Agr Univ, Coll Engn, Changsha 410000, Hunan, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    High-pressure EGR; Low-pressure EGR; Internal EGR; Pressure wave; Hydrogen-enriched natural gas engine;

    机译：高压EGR;低压EGR;内部EGR;压力波;富含氢气的天然气发动机;

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