High temperature ignition delay times of C5 primary alcohols
High temperature ignition delay times of C5 primary alcohols
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DOI：
10.1016/j.combustflame.2012.11.018
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发表时间：
2013-03
影响因子：
4.4
通讯作者：
Chenglong Tang;Liangjie Wei;Xingjia Man;Jiaxiang Zhang;Zuo-hua Huang;C. Law
中科院分区：
文献类型：
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作者：
Chenglong Tang;Liangjie Wei;Xingjia Man;Jiaxiang Zhang;Zuo-hua Huang;C. Law
在反射冲击波后测量三种 C5 伯醇异构体（正戊醇、异戊醇和 2-甲基-1-丁醇）的点火延迟时间。实验在1100-1500K的温度范围、1.0和2.6atm的压力、0.25、0.5和1.0的当量比以及燃料/O2/Ar混合物中的O2浓度从3.75%到15%变化的条件下进行。测量结果表明，三种异构体的着火延迟时间和总活化能均按异戊醇、2-甲基-1-丁醇、正戊醇的顺序递减。 Dagaut 及其同事最近开发的正戊醇 (Mech NP) 和异戊醇 (Mech IP) 的化学动力学机制用于模拟各自的点火延迟时间。结果表明，Mech NP 在当量比为 0.25 时具有接近的一致性，但随着当量比的增加，一致性减弱。对于研究的三个当量比，Mech IP 在相对较高的温度下产生相当接近的一致性，但在相对较低的温度下高估了 50% 的测量结果。提出了一种新的 2-甲基-1-丁醇高温机理，并根据点火延迟数据进行了验证。正戊醇和异戊醇的敏感性分析显示小自由基反应占主导地位。反应路径分析有助于进一步审查 Mech NP 中的燃料特定反应，从而改进动力学模型，并提高预测和测量的点火延迟时间以及喷射搅拌反应器结果之间的一致性。
Ignition delay times of the three C5 primary alcohol isomers (n-pentanol, iso-pentanol and 2-methyl-1-butanol) were measured behind reflected shock waves. Experiments were conducted in the temperature range of 1100–1500K, pressures of 1.0 and 2.6atm, equivalence ratios of 0.25, 0.5 and 1.0, and O2concentration in the fuel/O2/Ar mixtures varying from 3.75% to 15%. Measurements show that the ignition delay time and the global activation energy of the three isomers both decrease in the order of iso-pentanol, 2-methyl-1-butanol, and n-pentanol. Chemical kinetic mechanisms for n-pentanol (Mech NP) and iso-pentanol (Mech IP), recently developed by Dagaut and co-workers, were used to model the respective ignition delay times. Results show that Mech NP yields close agreement at the equivalence ratio of 0.25, but the agreement is moderated with increasing equivalence ratio. Mech IP yields fairly close agreements at relatively higher temperatures but over-predicts the measurements by 50% at relatively lower temperatures for the three equivalence ratios studied. A new 2-methyl-1-butanol high temperature mechanism was proposed and validated against the ignition delay data. Sensitivity analysis for both n-pentanol and iso-pentanol showed the dominance of small radical reactions. Reaction pathway analysis aided further scrutiny of the fuel-specific reactions in Mech NP, leading to refinement of the kinetic model, and improved agreement between the predicted and measured ignition delay times as well as the jet-stirred reactor results.