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Effects of H_2/CO addition on knock tendency and lean limit in a natural gas SI engine

机译：H_2 / CO的添加对天然气SI发动机爆震趋势和稀薄极限的影响

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摘要

Dedicated exhaust gas recirculation is an attractive way to improve the performances of internal combustion engines. Hydrogen (H-2) and carbon monoxide (CO) are primary combustible components in the reforming cylinder. Detailed knowledge of the effects of H-2/CO on knock tendency and intensity and even lean limit is essential for the better utilization of this sort of technologies. In this paper, the influences of H-2/CO on knock characteristics and lean limit are experimentally investigated. The experimental results indicate that the lean limit could be extended by 5-10% with 1% and 2% H-2/CO addition, respectively and meanwhile their addition significantly decreases THC and CO emissions despite of the slight increase in NOx emission. The knock-limited spark advance angles are determined using a pressure-based method. H-2/CO addition significantly increases knock tendency and intensity due to the increased energy density and faster flame propagation speed. Knock intensity increases linearly as knock onset angle is advanced towards to top dead center (TDC) due to higher end-gas temperature. However, the increase in knock intensity caused by H-2/CO addition is closely related to faster flame propagation speed. The sensitivity analysis reveals the crucial reaction in promoting flame propagation with H-2/CO addition is the branching reaction H+O-2=O+OH. And their addition also increases the reaction rates of another two dominating reactions CH3+HO2=CH3O+OH and CO+OH=CO2+H. 1% and 2% H-2/CO addition extend lower equivalence ratio limits by 14% and 26% which is beneficial for further efficiency improvement and emission reduction.
机译：专用排气再循环是改善内燃机性能的一种有吸引力的方法。氢气（H-2）和一氧化碳（CO）是重整罐中的主要可燃成分。对H-2 / CO对爆震趋势和强度甚至稀薄极限的影响的详细了解对于更好地利用此类技术至关重要。本文通过实验研究了H-2 / CO对爆震特性和稀薄极限的影响。实验结果表明，通过添加1％和2％的H-2 / CO可以分别将稀薄极限提高5-10％，并且尽管NOx排放量略有增加，但它们的添加可以显着降低THC和CO排放量。使用基于压力的方法确定爆震极限火花提前角。由于增加的能量密度和更快的火焰传播速度，H-2 / CO的添加显着增加了爆震趋势和强度。由于较高的最终气体温度，爆震强度随着爆震起始角朝向上止点（TDC）的增加而线性增加。但是，由H-2 / CO添加引起的爆震强度的增加与较快的火焰传播速度密切相关。敏感性分析表明，加入H-2 / CO促进火焰传播的关键反应是支化反应H + O-2 = O + OH。并且它们的添加还增加了另外两个主要反应CH3 + HO2 = CH3O + OH和CO + OH = CO2 + H的反应速率。加入1％和2％的H-2 / CO可将当量比下限降低14％和26％，这有利于进一步提高效率和减少排放。

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  • 来源
    《Fuel》 |2018年第1期|582-591|共10页
  • 作者

    Liu Changpeng; Li Fubai; Song Heping; Wang Zhi;

  • 作者单位

    Tsinghua Univ, State Key Lab Automot Safety & Energy, Beijing 100084, Peoples R China;

    Tsinghua Univ, State Key Lab Automot Safety & Energy, Beijing 100084, Peoples R China;

    Tsinghua Univ, State Key Lab Automot Safety & Energy, Beijing 100084, Peoples R China;

    Tsinghua Univ, State Key Lab Automot Safety & Energy, Beijing 100084, 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

    H-2/CO addition; Knock analysis; Lean limit; Natural gas;

    机译：H-2 / CO加成;爆震分析;贫极限;天然气;

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