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A study on the low-to-intermediate temperature ignition delays of long chain branched paraffin: Iso-cetane
Proceedings of the Combustion Institute ( IF 5.3 ) Pub Date : 2018-09-07 , DOI: 10.1016/j.proci.2018.08.039
Liang Yu , Yue Qiu , Yebing Mao , Sixu Wang , Can Ruan , Wencao Tao , Yong Qian , Xingcai Lu

Iso-cetane (2, 2, 4, 4, 6, 8, 8-heptamethylnonane) is known as a primary reference fuel for cetane number rating and is regarded as an applicable component for surrogate diesel fuel. In this study, ignition delays for iso-cetane homogeneous mixture were measured at equivalence ratios varying from 0.5 to 2.0, compressed pressures of 10, 15 and 20 bar, and compressed temperatures of 620–880 K in a heated rapid compression machine (RCM). Two-stage ignition characteristic of iso-cetane was observed for all mixtures. Negative temperature coefficient (NTC) behavior of iso-cetane ignition delay appears in the temperature range of 670–730 K, which is significantly lower than that of other large hydrocarbons. Influences of compressed temperature, compressed pressure, and mixture composition on iso-cetane ignition delays were also investigated. It is found that the total ignition delays shorten with the increase of compressed pressure, equivalence ratio and oxygen mole fraction. The first-stage ignition delays exhibit Arrhenius-like dependence on compressed temperature and are relatively insensitive to the change of other parameters. In addition, modeling study was conducted using an updated iso-cetane kinetic model developed from a literature iso-cetane mechanism. Simulation results show that the total ignition delays are underestimated while the temperature range of the NTC behavior is overestimated. Rate of production (ROP) analysis prior to the first-stage ignition was also conducted to identify the controlling reactions generating and consuming OH and HO2 radicals in low-temperature (low-T) reaction pathways.



中文翻译:

长链支链烷烃异十六烷的低至中温点火延迟的研究

异十六烷(2、2、4、4、4、6、8、8-七甲基壬烷)是十六烷值额定值的主要参考燃料,被认为是替代柴油的适用组分。在这项研究中,在快速加热压缩机(RCM)中,当量比为0.5至2.0,压缩压力为10、15和20 bar,压缩温度为620-880 K时,测量了异十六烷均质混合物的点火延迟。 。对于所有混合物,均观察到异十六烷的两阶段着火特性。异cetane点火延迟的负温度系数(NTC)行为出现在670–730 K的温度范围内,大大低于其他大型碳氢化合物的温度范围。还研究了压缩温度,压缩压力和混合物组成对异十六烷点火延迟的影响。发现随着压缩压力,当量比和氧气摩尔分数的增加,总着火延迟时间缩短。第一阶段的点火延迟表现出对压缩温度的类阿里尼乌斯样的依赖性,并且对其他参数的变化相对不敏感。此外,使用从文献异十六烷机理发展而来的更新的异十六烷动力学模型进行了建模研究。仿真结果表明,总点火延迟被低估了,而NTC行为的温度范围被高估了。还进行了第一阶段点火之前的生产率(ROP)分析,以确定产生和消耗OH和HO的控制反应 第一阶段的点火延迟表现出对压缩温度的类阿里尼乌斯样的依赖性,并且对其他参数的变化相对不敏感。此外,使用从文献异十六烷机理发展而来的更新的异十六烷动力学模型进行了建模研究。仿真结果表明,总点火延迟被低估了,而NTC行为的温度范围被高估了。还进行了第一阶段点火之前的生产率(ROP)分析,以确定产生和消耗OH和HO的控制反应 第一级点火延迟表现出对压缩温度的类阿里尼乌斯样的依赖性,并且对其他参数的变化相对不敏感。此外,使用从文献异十六烷机理发展而来的更新的异十六烷动力学模型进行了建模研究。仿真结果表明,总点火延迟被低估了,而NTC行为的温度范围被高估了。还进行了第一阶段点火之前的生产率(ROP)分析,以确定产生和消耗OH和HO的控制反应 使用从文献异十六烷机理开发的更新的异十六烷动力学模型进行模型研究。仿真结果表明,总点火延迟被低估了,而NTC行为的温度范围被高估了。还进行了第一阶段点火之前的生产率(ROP)分析,以确定产生和消耗OH和HO的控制反应 使用从文献异十六烷机理开发的更新的异十六烷动力学模型进行模型研究。仿真结果表明,总点火延迟被低估了,而NTC行为的温度范围被高估了。还进行了第一阶段点火之前的生产率(ROP)分析,以确定产生和消耗OH和HO的控制反应低温(low-T)反应途径中有2个自由基。

更新日期:2018-09-07
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