A fundamental study on the control of the HCCI combustion and emissions by fuel design concept combined with controllable EGR. Part 1. The basic characteristics of HCCI combustion
A fundamental study on the control of the HCCI combustion and emissions by fuel design concept combined with controllable EGR. Part 1. The basic characteristics of HCCI combustion
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DOI：
10.1016/j.fuel.2004.12.014
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发表时间：
2005-06
期刊：
影响因子：
7.4
通讯作者：
Xingcai Lu;Wei Chen;Zhen Huang
中科院分区：
文献类型：
--
作者：
Xingcai Lu;Wei Chen;Zhen Huang
本文研究了使用主要参考燃料 (PRF) 及其混合物的均质充量压缩点火 (HCCI) 发动机的基本燃烧参数，包括点火正时开始、燃烧持续时间、周期变化以及一氧化碳 (CO)、未燃烧碳氢化合物 (UHC) 和一氧化氮 (NOx) 排放。对两种主要参考燃料（正庚烷和异辛烷）及其与 RON25、RON50、RON75 和 RON90 的混合物进行了评估。实验结果表明，在第一阶段燃烧中，随着研究辛烷值（RON）的增加，着火开始延迟，最大放热量减小，第一阶段燃烧压力上升和温度上升减小。此外，第一阶段燃烧中的累积放热量很大程度上取决于混合物中正庚烷的浓度。第二级燃烧的点火开始与第一级燃烧的点火开始呈线性关系。第二阶段燃烧的燃烧持续时间随着当量比的增大和辛烷值的减小而减小。随着辛烷值的降低，循环间的变化得到改善。
This article investigates the basic combustion parameters including start of the ignition timing, burn duration, cycle-to-cycle variation, and carbon monoxide (CO), unburned hydrocarbon (UHC), and nitric oxide (NOx) emissions of homogeneous charge compression ignition (HCCI) engines fueled with primary reference fuels (PRFs) and their mixtures. Two primary reference fuels, n-heptane and iso-octane, and their blends with RON25, RON50, RON75, and RON90 were evaluated. The experimental results show that, in the first-stage combustion, the start of ignition retards, the maximum heat release rate decreases, and the pressure rising and the temperature rising during the first-stage combustion decrease with the increase of the research octane number (RON). Furthermore, the cumulative heat release in the first-stage combustion is strongly dependent on the concentration of n-heptane in the mixture. The start of ignition of the second-stage combustion is linear with the start of ignition of the first-stage. The combustion duration of the second-stage combustion decreases with the increase of the equivalence ration and the decrease of the octane number. The cycle-to-cycle variation improved with the decrease of the octane number.