Improving the Prediction Accuracy of the Extinction of Stretched Methanol/Air Premixed Flames
Improving the Prediction Accuracy of the Extinction of Stretched Methanol/Air Premixed Flames
复制标题
提高拉伸甲醇/空气预混火焰熄灭的预测精度
DOI：
10.1080/00102202.2019.1609952
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发表时间：
2019-05
影响因子：
1.9
通讯作者：
Zhang Jiansheng
中科院分区：
文献类型：
--
作者：
Yang Xiehe;Shen Wenfeng;Zhang Yang;Zhang Hai;Lyu Junfu;Zhang Jiansheng
摘要采用逆流式火焰结构，对甲醇/空气预混火焰的层流火焰速度和熄灭应变率进行了实验测量。验证了5种甲醇氧化化学动力学模型的有效性。结果表明，实验结果与理论预测结果存在显著差异。灵敏度分析表明，主要反应为H2/O2链支化/增长反应、CO/HCO反应以及CH 3OH和CH 2 OH的脱氢反应。进一步的动力学研究表明，反应速率常数的CH 2 OH脱氢反应的消光应变速率的预测是重要的。利用最近发表的数据对SanDiego方案中最敏感的链支化/增长反应的反应速率常数进行了修正。改进后的San Diego格式不仅在预测层流火焰速度、点火延迟时间和甲醇/空气火焰的非预混熄火极限方面保持了良好的性能，而且显著提高了预混熄火应变速率的预测能力。
ABSTRACT Experimental measurements of the laminar flame speed and extinction strain rate of premixed methanol/air flames were conducted using the counterflow configuration. The validities of five methanol oxidation chemical kinetic models were verified. The results showed that a notable discrepancy was observed between the experimental and predicted extinction strain rate. Sensitivity analyses showed that the dominating reactions were H2/O2 chain branching/propagation reactions, CO/HCO reactions and dehydrogenation reactions of CH3OH and CH2OH. Further kinetic studies revealed that the reaction rate constants of the CH2OH dehydrogenation reactions were important in the prediction of the extinction strain rate. The reaction rate constants of the most sensitive chain branching/propagation reactions in San Diego scheme were updated using the recently published data. This updated San Diego scheme not only remained good performances in predicting laminar flame speed, ignition delay time, and non-premixed extinction limit of methanol/air flames but also significantly improved the prediction of the premixed extinction strain rate.
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