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The effect of iso-octane addition on combustion and emission characteristics of a HCCI engine fueled with n-heptane

机译:添加异辛烷对正庚烷供油的HCCI发动机燃烧和排放特性的影响

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摘要

This paper investigates the effects of iso-octane addition on the combustion and emission characteristics of a single-cylinder, variable compression ratio, homogeneous charge compression ignition (HCCI) engine fueled with n-heptane. The engine was operated with four fuel blends containing up to 50% iso-octane by liquid volume at 900 rpm, 50:1 air-to-fuel ratio, no exhaust gas recirculation, and an intake mixture temperature of 30\ub0C. A detailed analysis of the regulated and unregulated emissions was performed including validation of the experimental results using a multizone model with detailed fuel chemistry. The results show that iso-octane addition reduced HCCI combustion efficiency and retarded the combustion phasing. The range of engine compression ratios where satisfactory HCCI combustion occurred was found to narrow with increasing iso-octane percentage in the fuel. NOx emissions increased with iso-octane addition at advanced combustion phasing, but the influence of iso-octane addition was negligible once CA50 (crank angle position at which 50% heat is released) was close to or after top dead center. The total unburned hydrocarbons (THC) in the exhaust consisted primarily of alkanes, alkenes, and oxygenated hydrocarbons. The percentage of alkanes, the dominant class of THC emissions, was found to be relatively constant. The alkanes were composed primarily of unburned fuel compounds, and iso-octane addition monotonically increased and decreased the iso-octane and n-heptane percentages in the THC emissions, respectively. The percentage of alkenes in the THC was not significantly affected by iso-octane addition. Iso-octane addition increased the percentage of oxygenated hydrocarbons. Small quantities of cycloalkanes and aromatics were detected when the iso-octane percentage was increased beyond 30%.
机译:本文研究了异辛烷的添加对正庚烷为燃料的单缸,可变压缩比,均质充量压缩点火(HCCI)发动机的燃烧和排放特性的影响。该发动机使用四种混合燃料运行,这些混合燃料在900 rpm时的液体体积中含最多50%的异辛烷,空燃比为50:1,无废气再循环,进气混合物温度为30℃。进行了管制和非管制排放的详细分析,包括使用具有详细燃料化学成分的多区域模型对实验结果进行验证。结果表明,异辛烷的添加降低了HCCI的燃烧效率并延迟了燃烧定相。发现发生令人满意的HCCI燃烧的发动机压缩比的范围随着燃料中异辛烷值的增加而变窄。 NOx排放在高级燃烧阶段随添加异辛烷而增加,但是一旦CA50(释放50%热量的曲轴角位置)接近或超过上止点,添加异辛烷的影响就可以忽略不计。排气中的总未燃烧碳氢化合物(THC)主要由烷烃,烯烃和氧化烃组成。发现四氢大麻酚排放的主要类别烷烃的百分比相对恒定。烷烃主要由未燃烧的燃料化合物组成,异辛烷的添加分别单调增加和减少了THC排放中异辛烷和正庚烷的百分比。 THC中烯烃的百分比不受异辛烷加成的影响。异辛烷的添加增加了氧化烃的百分比。当异辛烷值增加到30%以上时,会检测到少量的环烷烃和芳烃。

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