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首页> 外文期刊>Fuel >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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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

机译：结合燃料设计概念和可控EGR对HCCI燃烧和排放进行控制的基础研究。第1部分。HCCI燃烧的基本特征

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摘要

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 (NO_x) 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.
机译：本文研究了基本燃烧参数，包括点火正时的开始，燃烧持续时间，周期变化，以及均匀电荷压缩点火的一氧化碳（CO），未燃烧的碳氢化合物（UHC）和一氧化氮（NO_x）排放（ HCCI）发动机以主要参考燃料（PRF）及其混合物为燃料。对两种主要的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，随着研究辛烷值的增加，点火开始延迟，最大放热率降低，第一阶段燃烧过程中的压力上升和温度上升减小（ RON）。此外，第一阶段燃烧中的累积热量释放强烈取决于混合物中正庚烷的浓度。第二阶段燃烧的点火开始与第一阶段的点火开始是线性的。第二级燃烧的燃烧持续时间随着当量比的增加和辛烷值的减少而减小。随着辛烷值的减少，循环间的变化得到改善。

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