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首页> 外文会议>Proceedings of the 2009 spring technical conference of the ASME Internal Combustion Engine Division >MODELING THE EFFECTS OF STEAM-FUEL REFORMING PRODUCTS ON HOMOGENEOUS CHARGE COMPRESSION IGNITION OF n-HEPTANE
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MODELING THE EFFECTS OF STEAM-FUEL REFORMING PRODUCTS ON HOMOGENEOUS CHARGE COMPRESSION IGNITION OF n-HEPTANE

机译：模拟蒸汽-燃料重整产品对正庚烷均质装料压缩点火的影响

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Homogeneous Charge Compression Ignition (HCCI) offers benefits of high efficiency with low emissions, but suffers load range limitations and control issues. A method to improve control of HCCI was numerically investigated based on two separate fuel streams with different autoignition characteristics to regulate timing and heat release at specific operational conditions. In this numerical study n-heptane was selected as the primary fuel, and the secondary fuel was defined as a reformed product of n-heptane (RG). The reformed fuel species composition was experimentally determined based on steam-heptane reforming process at a steam/carbon mole ratio of 2:1. In addition to H_2 and CO, the reformed fuel stream was composed of CH_4, CO_2, H_2O and non-reformed n-heptane. A single zone model using a detailed chemical kinetic mechanism was implemented on CHEMKIN to study the effects of base fuel and steam-fuel reforming products on the ignition timing and heat release characteristics. The study was performed considering the reformed fuel species composition at total n-heptane conversion (stoichiometric) and also at the composition corresponding to a specific set of operational reforming temperatures. The computational model confirmed that the reformed products have a strong influence on the low temperature heat release (LTHR) region, affecting the onset of the high temperature heat release (HTHR). The ignition timing was proportionally delayed with respect to the baseline fuel case when higher concentrations of reformed gas were used.
机译：均质电荷压缩点火（HCCI）具有高效率，低排放的优点，但存在负载范围限制和控制问题。基于两种具有不同自燃特性的独立燃料流，在特定的操作条件下调节正时和放热，对改善HCCI控制的方法进行了数值研究。在此数值研究中，正庚烷被选作主要燃料，而次级燃料被定义为正庚烷（RG）的重整产物。基于蒸汽/正庚烷重整过程以蒸汽/碳摩尔比为2：1通过实验确定重整的燃料种类组成。除了H_2和CO外，重整燃料流还包括CH_4，CO_2，H_2O和未重整的正庚烷。在CHEMKIN上实现了使用详细化学动力学机制的单区模型，以研究基础燃料和蒸汽燃料重整产品对点火正时和放热特性的影响。考虑总正庚烷转化率（化学计量）以及对应于一组特定的操作重整温度的重整燃料物质组成进行了研究。计算模型证实，重整产物对低温放热（LTHR）区域有很大影响，影响了高温放热（HTHR）的开始。当使用较高浓度的重整气体时，点火时间相对于基准燃料情况成比例地延迟。

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