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A Shock Tube Study of Ethylene/Air Ignition Characteristics over a Wide Temperature Range

机译：宽温度范围内乙烯/空气点火特性的冲击管研究

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As a key intermediate product, ethylene plays an important role in the combustion of heavy hydrocarbons. Very limited experiments have focused on the high temperature (1000 K) ethylene ignition at the real fuel-air condition, but no one on the ethylene/air ignition at low temperatures (1000 K). In the present work, ignition delay times of ethylene/air mixtures were measured at temperatures of 721 to 1307 K, pressures of 0.97 to 20.54 atm, and equivalence ratios of 0.5, 1.0 and 2.0?and ignition characteristics of ethylene/air were discussed. The high-temperature results show that ignition delay times decrease with the increase of temperature monotonously; the ignition delay of fuel-lean mixture exhibits an unusual behavior of almost zero pressure dependence, and stoichiometric and fuel-rich mixtures still have ordinary pressure dependence, with a pressure increase producing a decrease of ignition delay time. The results at wide temperatures indicate that ethylene/air ignition delay shows no negative temperature coefficient (NTC) behavior at low temperatures, and has an inflection point at the temperature of about 1000 K, showing a two-region ignition feature. The ignition delay times at two regions can be described by Arrhenius-type formulas, respectively, and the ethylene/air ignition delay is much less sensitive to the temperature at the low-temperature region. A good agreement is found between current data and another experimental data for high-temperature ignition. The mechanism used predicts the ethylene/air ignition delay well at high temperatures but must overpredict the ignition delay times at low temperatures. This work contributes to understanding the ethylene ignition properties at a wide temperature range and provides experimental data valuable for validating and refining the chemical kinetics mechanism of ethylene.
机译：作为一个关键的中间产品，乙烯在重质烃的燃烧中起重要作用。非常有限的实验在真正的燃料空气条件下专注于高温（> 1000K）乙烯点火，但在低温下没有一种乙烯/空气点火（<1000k）。在本作本作中，在721至1307k的温度下测量乙烯/空气混合物的点火延迟时间，0.97至20.54atm的压力，讨论0.5,1.0和2.0的等效比率为0.5,1.0和2.0？和乙烯/空气的点火特性。高温结果表明，点火延迟时间随着温度的增加而减小;燃料稀释混合物的点火延迟表现出几乎零压力依赖性的不寻常行为，化学计量和富含燃料的混合物仍然具有普通的压力依赖性，并且压力增加产生点火延迟时间的降低。宽温度下的结果表明乙烯/空气点火延迟在低温下没有显示负温度系数（NTC）行为，并且在约1000k的温度下具有拐点，显示出两个区域点火特征。 Arhenius型公式可以描述两个区域的点火延迟时间，并且乙烯/空气点火延迟对低温区域的温度远低得多。在当前数据和高温点火的另一种实验数据之间发现了一个良好的一致性。所用机制在高温下预测乙烯/空气点火延迟，但必须在低温下覆盖点火延迟时间。这项工作有助于了解宽温度范围内的乙烯点火性能，并为验证和精炼乙烯化学动力学机制提供实验数据。

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