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首页> 外文期刊>Combustion and Flame >An experimental and numerical investigation on the influence of external gas recirculation on the HCCI autoignition process in an engine: Thermal, diluting, and chemical effects
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An experimental and numerical investigation on the influence of external gas recirculation on the HCCI autoignition process in an engine: Thermal, diluting, and chemical effects

机译：关于外部气体再循环对发动机HCCI自燃过程影响的实验和数值研究：热，稀释和化学作用

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摘要

In order to contribute to the solution of controlling the autoignition in a homogeneous charge compression ignition (HCCI) engine, parameters linked to external gas recirculation (EGR) seem to be of particular interest. Experiments performed with EGR present some difficulties in interpreting results using only the diluting and thermal aspect of EGR. Lately, the chemical aspect of EGR is taken more into consideration, because this aspect causes a complex interaction with the dilution and thermal aspects of EGR. This paper studies the influence of EGR on the autoignition process and particularly the chemical aspect of EGR. The diluents present in EGR are simulated by N_2 and CO_2, with dilution factors going from 0 to 46 vol%. For the chemically active species that could be present in EGR, the species CO, NO, and CH_2O are used. The initial concentration in the inlet mixture of CO and NO is varied between 0 and 170 ppm, while that of CH_2O alters between 0 and 1400 ppm. For the investigation of the effect of the chemical species on the autoignition, a fixed dilution factor of 23 vol% and a fixed EGR temperature of 70 ℃ are maintained. The inlet temperature is held at 70 ℃, the equivalence ratios between 0.29 and 0.41, and the compression ratio at 10.2. The fuels used for the autoignition are n-heptane and PRF40. It appeared that CO, in the investigated domain, did not influence the ignition delays, while NO had two different effects. At concentrations up until 45 ppm, NO advanced the ignition delays for the PRF40 and at higher concentrations, the ignition delayed. The influence of NO on the autoignition of n-heptane seemed to be insignificant, probably due to the higher burn rate of n-heptane. CH_2O seemed to delay the ignition. The results suggested that especially the formation of OH radicals or their consumption by the chemical additives determines how the reactivity of the autoignition changed.
机译：为了有助于控制均质充量压缩点火（HCCI）发动机中自燃的解决方案，与外部气体再循环（EGR）关联的参数似乎特别有意义。仅使用EGR的稀释和热方面，使用EGR进行的实验在解释结果方面存在一些困难。近来，更多地考虑了EGR的化学方面，因为该方面引起与EGR的稀释和热方面的复杂相互作用。本文研究了EGR对自燃过程的影响，尤其是EGR的化学方面。 EGR中存在的稀释剂是通过N_2和CO_2进行模拟的，稀释系数为0至46 vol％。对于EGR中可能存在的化学活性物质，使用的是CO，NO和CH_2O。 CO和NO的进口混合物中的初始浓度在0至170 ppm之间变化，而CH_2O的初始浓度在0至1400 ppm之间变化。为了研究化学物质对自燃的影响，保持固定的稀释倍数为23体积％，固定的EGR温度为70℃。入口温度保持在70℃，当量比在0.29和0.41之间，压缩比在10.2。用于自燃的燃料为正庚烷和PRF40。看起来，在研究范围内，一氧化碳不影响点火延迟，而一氧化氮具有两种不同的作用。在浓度高达45 ppm时，NO提前PRF40的点火延迟，而在较高浓度时，点火延迟。 NO对正庚烷自燃的影响似乎微不足道，这可能是由于正庚烷的较高燃烧速率所致。 CH_2O似乎延迟了点火。结果表明，尤其是OH自由基的形成或化学添加剂对其的消耗决定了自燃反应性的变化方式。

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  • 来源
    《Combustion and Flame》 |2008年第3期|476-489|共14页
  • 作者

    Hatim Machrafi; Simeon Cavadias; Philippe Guibert;

  • 作者单位

    UPMC Universite Paris 06, LGPPTS, Ecole Nationale Superieure de Chimie de Paris, 11, rue de Pierre et Marie Curie, 75005 Paris, France UPMC Universite Paris 06, FRT, Institut Jean Le Rond D'Alembert, 2, place de la Gare de Ceinture, 78210 St Cyr l'Ecole, France UPMC Universite Paris 06, 11, rue de Pierre et Marie Curie, 75005 Paris, France;

    UPMC Universite Paris 06, LGPPTS, Ecole Nationale Superieure de Chimie de Paris, 11, rue de Pierre et Marie Curie, 75005 Paris, France UPMC Universite Paris 06, FRT, Institut Jean Le Rond D'Alembert, 2, place de la Gare de Ceinture, 78210 St Cyr l'Ecole, France;

    UPMC Universite Paris 06, FRT, Institut Jean Le Rond D'Alembert, 2, place de la Gare de Ceinture, 78210 St Cyr l'Ecole, France;

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

    autoignition control; HCCI engine; chemical additives; dilution; external gas recirculation; carbon monoxide; nitrogen oxide; formaldehyde;

    机译：自燃控制HCCI发动机;化学添加剂;稀释;外部气体再循环;一氧化碳;氮氧化物;甲醛;

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