Experimental and Numerical Comparison of Currently Available Reaction Mechanisms for Laminar Flame Speed in 70/30 (%vol.) NH3/H2 Flames
Experimental and Numerical Comparison of Currently Available Reaction Mechanisms for Laminar Flame Speed in 70/30 (%vol.) NH3/H2 Flames
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DOI：
10.1016/j.jaecs.2023.100139
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发表时间：
2023-04
影响因子：
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通讯作者：
A. Alnasif;S. Zitouni;S. Mashruk;P. Brequigny;M. Kovaleva;C. Mounaim-Rousselle;A. Valera-Medina
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文献类型：
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作者：
A. Alnasif;S. Zitouni;S. Mashruk;P. Brequigny;M. Kovaleva;C. Mounaim-Rousselle;A. Valera-Medina
为了实现净零碳排放，氨作为一种有希望的替代燃料正在获得吸引力。然而，氨的燃烧特性还有待进一步研究。本研究旨在通过实验测量和动力学反应机理分析，分析任何可燃混合物的基本物理化学性质--层流火焰速度。实验研究了70/30(%VOL)NH_3/H_2在较宽当量比(0.6~1.4)的常压和常温下的层流火焰速度，并与36种动力学反应机理的性能进行了比较，以评价它们对被测NH_3/H_2混合物的层流火焰速度预测的性能。根据本研究的实验测量和数值数据，采用绝对百分比误差(APE)公式进行初步估计。研究发现，Duynslegher等人。2012款车型在APE值在0%-6%之间的精益和化学计量比条件下表现出良好的性能速度。Nakamura等人，2017年和Gotama等人，2022年的机制证明了在丰富的条件下对层流火焰速度的良好估计。敏感性分析表明，H+O2=O+OH、NH2+NH2=N2H2+H2和OH+H2=H+H2O反应在所有条件下对层流火焰速度的促进作用最大，而H+O2(+M)=HO2+M、NH2+H=NH+H2和NH2+O=HNO+H在所有条件下对层流火焰速度的抑制起主要作用。上述反应对当量比的影响不同，主要是由于绝热火焰温度的变化。
To achieve net zero carbon emissions, ammonia is gaining traction as a promising alternative fuel. However, the combustion characteristics of ammonia need further investigation. The current study aims to analyze the laminar flame speed, a fundamental physio-chemical property of any combustible mixture, through experimental measurements and kinetic reaction mechanism analysis. The laminar flame speed of 70/30 (%vol) NH3/H2at atmospheric pressure and ambient temperature across a wide range of equivalence ratios (0.6–1.4) was studied experimentally and compared to the performance of 36 kinetic reaction mechanisms to appraise their performance concerning laminar flame speed prediction for the measured NH3/H2mixture. The absolute percentage error (APE) formula has been adopted for preliminary estimation based on the experimental measurements of the present study and numerical data. The study found that Duynslaegher et al. 2012 model shows good performance speed across lean and stoichiometry conditions with an APE value between 0%-6%. The mechanism of Nakamura et al., 2017 and Gotama et al., 2022 demonstrates a good estimation of laminar flame speed under rich conditions. The sensitivity analysis revealed that the reactions H+O2=O+OH, NH2+NH2=N2H2+H2, and OH+H2=H+H2O are the most crucial reaction with considerable effect in promoting the laminar flame speed at all conditions, while the reactions of H+O2(+M)=HO2+M, NH2+H=NH+H2, and NH2+O=HNO+H play an essential role in the retardation of laminar flame speed at all conditions. The effect of the aforementioned reactions varies for the equivalence ratio, mainly due to changes in adiabatic flame temperature.