Mapping surrogate gasoline compositions into RON/MON space
Mapping surrogate gasoline compositions into RON/MON space
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DOI：
10.1016/j.combustflame.2010.02.003
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发表时间：
2010-06-01
影响因子：
4.4
通讯作者：
Kalghatgi, Gautam
中科院分区：
文献类型：
--
作者：
Morgan, Neal;Smallbone, Andrew;Kalghatgi, Gautam
本文采用增广单纯形设计，以甲苯、正庚烷、异辛烷组成的三组分替代燃料（简称甲苯参比燃料TRF）的辛烷值（罗恩和MON）为新的实验数据，建立了一个简单的响应面模型，用于计算任意TRF混合物的辛烷值。该模型是二阶的复杂性，并被证明是更准确的标准的“线性体积”（LBV）模型，这是经常使用时，没有其他信息。这样的观察结果是由于三种组分之间的辛烷值的协同和拮抗混合的存在。特别是，甲苯和异辛烷的拮抗性共混导致灵敏度最大化，其位于甲苯/异辛烷线上。对模型方程进行了反演，从而将罗恩/MON空间映射回成分空间。对于具有已知罗恩和MON的给定燃料，使得人们能够使用两个简单的公式来确定为了模拟该燃料而要混合的甲苯、正庚烷和异辛烷的体积分数。使用罗恩为98.5和MON为88的汽油的HCCI发动机模拟使用TRF燃料进行模拟，根据导出的方程混合以匹配罗恩和MON。模拟与实验获得的压力分布很好地匹配，特别是当与仅使用与罗恩或MON匹配的PRF燃料的模拟相比时。这表明映射是准确的，并且为了模拟炼油厂汽油，不仅需要匹配燃料的罗恩，而且还需要匹配燃料的MON。(C)2010燃烧研究所。爱思唯尔公司出版All rights reserved.
In this paper, new experimentally determined octane numbers (RON and MON) of blends of a tri-component surrogate consisting of toluene, n-heptane, i-octane (called toluene reference fuel TRF) arranged in an augmented simplex design are used to derive a simple response surface model for the octane number of any arbitrary TRF mixture. The model is second-order in its complexity and is shown to be more accurate to the standard "linear-by-volume" (LbV) model which is often used when no other information is available. Such observations are due to the existence of both synergistic and antagonistic blending of the octane numbers between the three components. In particular, antagonistic blending of toluene and iso-octane leads to a maximum in sensitivity that lies on the toluene/iso-octane line. The model equations are inverted so as to map from RON/MON space back into composition space. Enabling one to use two simple formulae to determine, for a given fuel with known RON and MON, the volume fractions of toluene, n-heptane and iso-octane to be blended in order to emulate that fuel. HCCI engine simulations using gasoline with a RON of 98.5 and a MON of 88 were simulated using a TRF fuel, blended according to the derived equations to match the RON and MON. The simulations matched the experimentally obtained pressure profiles well, especially when compared to simulations using only PRF fuels which matched the RON or MON. This suggested that the mapping is accurate and that to emulate a refinery gasoline, it is necessary to match not only the RON but also the MON of the fuel. (C) 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved.