This study explores the impacts of combinations of biofuel (ethanol, isobutanol and 2-methyl furan) and aromatic (toluene) compounds in a four component fuel blend, at fixed research octane number (RON) on ignition delay measured in an advanced fuel ignition delay analyzer (AFIDA 2805). Ignition delay measurements were performed over a range of temperatures from 400 to 725 °C (673 to 998 K) and two chamber pressures of 10 and 20 bar. The four component mixtures are compared to primary reference fuels at RON values of 90 and 100. The ignition delay measurements show that as the aromatic and biofuel concentrations increased, two stage ignition behavior was suppressed, at both initial chamber pressures. But both RON 100 (isooctane) and RON 90 reference fuels showed two stage ignition behavior, as did fuel mixtures with low biofuel and aromatic content. RON 90 fuels showed stronger two stage ignition behavior than RON 100 fuels, as expected. Depending on the type of biofuel in the mixture, the ignition delay at low chamber temperatures could be far greater than for the reference fuels. In particular, for the RON 100 mixtures at either 10 or 20 bar initial chamber pressure, the ignition delay at 400 °C (673 K) for the high level blend of 2-methyl furan and toluene (30 vol% of each) exhibited an ignition delay that was 10 times longer than for neat isooctane. The results show the strong non-linear octane blending response of these three biofuel compounds, especially in concert with the kinetic antagonism that toluene is known to display in mixtures with isooctane. These results have implications for the formulation of biofuel mixtures for spark ignition and advanced compression ignition engines, where this non-linear octane blending response could be exploited to improve knock resistance, or modulate the autoignition process.

这项研究探索了在固定研究辛烷值（RON）下以先进燃料点火延迟测量的点火延迟对生物燃料（乙醇，异丁醇和2-甲基呋喃）和芳族（甲苯）化合物在四组分混合燃料中的组合对点火延迟的影响分析仪（AFIDA 2805）。在400至725°C（673至998 K）的温度范围以及两个10和20 bar的腔室压力下进行点火延迟测量。在RON值为90和100的情况下，将四种成分的混合物与主要参考燃料进行了比较。点火延迟的测量结果表明，随着芳香族和生物燃料浓度的增加，在两个初始燃烧室压力下，两阶段的点火行为均得到抑制。但是RON 100（异辛烷）和RON 90参考燃料都表现出两阶段点火行为，生物燃料和芳烃含量低的混合燃料也是如此。正如预期的那样，RON 90燃料表现出比RON 100燃料更强的两阶段点火性能。取决于混合物中生物燃料的类型，在低室内温度下的点火延迟可能远大于参考燃料的点火延迟。尤其是，对于初始压力为10或20 bar的RON 100混合物，2-甲基呋喃和甲苯（每种为30 vol％）的高含量混合物在400°C（673 K）时的着火延迟表现为点火延迟比纯异辛烷长10倍。结果表明这三种生物燃料化合物具有很强的非线性辛烷值共混反应，特别是与已知的甲苯与异辛烷的混合物显示出的动力学拮抗作用相一致。