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首页> 外文期刊>Journal of Engineering for Gas Turbines and Power >Understanding Ignition Delay Effects With Pure Component Fuels in a Single-Cylinder Diesel Engine
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Understanding Ignition Delay Effects With Pure Component Fuels in a Single-Cylinder Diesel Engine

机译：了解单缸柴油发动机中纯组分燃料的点火延迟效应

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In order to better understand how future candidate diesel fuels may affect combustion characteristics in diesel engines, 21 pure component hydrocarbon fuels were tested in a single-cylinder diesel engine. These pure component fuels included normal alkanes (C6-C16), normal primary alkenes (C6-C18), isoalkanes, cycloalkanes/-enes, and aromatic species. In addition, seven fuel blends were tested, including commercial diesel fuel, U.S. Navy JP-5 aviation fuel, and five Fischer-Tropsch synthetic fuels. Ignition delay was used as a primary combustion metric for each fuel, and the ignition delay period was analyzed from the perspective of the physical delay period followed by the chemical delay period. While fuel properties could not strictly be varied independently of each other, several ignition delay correlations with respect to physical properties were suggested. In general, longer ignition delays were observed for component fuels with lower liquid fuel density, kinematic viscosity, and liquid-air surface tension. Longer ignition delay was also observed for component fuels with higher fuel volatility, as measured by boiling point and vapor pressure. Experimental data show two regimes of operation: For a carbon chain length of 12 or greater, there is little variation in ignition delay for the tested fuels. For shorter chain lengths, a fuel molecular structure is very important. Carbon chain length was used as a scaling variable with an empirical factor to collapse the ignition delay onto a single trend line. Companion detailed kinetic modeling was pursued on the lightest fuel species set (C6) since this fuel set possessed the greatest ignition delay differences. The kinetic model gives a chemical ignition delay time, which, together with the measured experimental ignition delay, suggests that the physical and chemical delay period have comparable importance. However, the calculated chemical delay periods capture the general variation in the overall ignition delay and could be used to predict the ignition delay of possible future synthetic diesel fuels.
机译：为了更好地理解未来的候选柴油燃料可能如何影响柴油机的燃烧特性，在单缸柴油机中测试了21种纯组分碳氢燃料。这些纯组分燃料包括正构烷烃（C6-C16），正构伯烯烃（C6-C18），异烷烃，环烷烃/烯烃和芳香族物质。此外，还测试了七种混合燃料，包括商用柴油，美国海军JP-5航空燃料和五种费-托合成燃料。将点火延迟用作每种燃料的主要燃烧指标，并从物理延迟时间段和化学延迟时间段的角度分析了点火延迟时间段。虽然不能严格地彼此独立地改变燃料性质，但是提出了一些关于物理性质的点火延迟相关性。通常，对于液体燃料密度，运动粘度和液体-空气表面张力较低的组分燃料，观察到较长的点火延迟。通过沸点和蒸气压测得，具有较高燃料挥发性的组分燃料还观察到更长的点火延迟。实验数据显示了两种运行方式：对于12或更长的碳链长度，被测试燃料的点火延迟几乎没有变化。对于较短的链长，燃料分子结构非常重要。碳链长度用作具有经验因子的缩放变量，以将点火延迟折叠到一条趋势线上。伴随详细的动力学建模是在最轻的燃料种类组（C6）上进行的，因为该燃料组具有最大的点火延迟差异。该动力学模型给出了化学点火延迟时间，该时间与测得的实验点火延迟一起表明，物理和化学延迟时间具有相当的重要性。但是，计算出的化学延迟时间捕获了整体点火延迟的一般变化，可用于预测未来可能的合成柴油燃料的点火延迟。

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