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Experimental and model analyses of laminar combustion characteristics of variable composition CO/H2/CH4 mixtures at high N2 and CO2 concentrations
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2020-05-07 , DOI: 10.1002/er.5477 Qiaosheng Zhang 1 , Guoyan Chen 1 , Fahui Wang 1 , Haoxin Deng 1 , Xiaoping Wen 1 , Anchao Zhang 1 , Wei Sheng 1
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2020-05-07 , DOI: 10.1002/er.5477 Qiaosheng Zhang 1 , Guoyan Chen 1 , Fahui Wang 1 , Haoxin Deng 1 , Xiaoping Wen 1 , Anchao Zhang 1 , Wei Sheng 1
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The effect of variable composition CO/H2/CH4 mixtures (15%‐20% CO, 5%‐20% H2, 0%‐15% CH4) at high diluent ratios (15% CO2 and 50% N2) on laminar combustion characteristics has been studied by experiment and numerical simulation. The laminar burning velocities (LBVs) of seven biomass‐derived gases in an equivalent ratio of 0.6 to 1.4 have been experimentally measured by the spherical expansion flame method under ambient conditions. The experimental results obtained based on the linear and nonlinear extrapolation methods were compared with the data in the literature and the predictions of four detailed chemical kinetic models (FFCM‐1, GRI 3.0, USC II, San Diego 2016). The results show that an increase in the equivalence ratio or a decrease in the H2 fraction in the mixture is beneficial to the reduction of the LBV difference obtained by the linear and nonlinear extrapolation methods. With the increase of H2 fraction in the mixture, the highly thermally diffusive fuel significantly enhanced the LBV and the maximum LBV leaned toward the fuel‐rich side. For mixtures with a higher CH4 fraction than H2, it has the lowest LBV but has the higher adiabatic temperature and heat release. The predictions of the four models show that for all different composition mixtures, San Diego 2016 has over‐predicted on the lean side. The FFCM‐1 and GRI 3.0 matched better with the experimentally measured LBV of the H2‐rich mixture. With the increase of CH4 fraction relative to H2, the prediction of USC II is slightly reduced on the rich side, and all the predictions under stoichiometric conditions are overpredicted compared to the experimental data. Sensitivity analyses are performed on flames of the mixture with different compositions at Φ = 0.8 and 1.2, it is found that with the addition of CH4 fraction to the mixture, R1 gradually became the most dominating reaction, which has a stronger effect on LBV. Furthermore, the reaction paths and heat release of different composition mixtures under stoichiometric conditions are analyzed. The Markstein lengths of variable composition mixtures at different equivalence ratios are studied. It suggested that the Markstein length gradually decreases with the increase of CH4 in the fuel, thus the stretched flame speed is more susceptible to flame stretch rate and the flame stability decreases.
中文翻译：
高N2和CO2浓度下可变组成的CO / H2 / CH4混合物层流燃烧特性的实验和模型分析
可变组成CO的效果/ H 2 / CH 4混合物（15％-20％CO，5％-20％H 2，0％-15％CH 4）在高稀释比（15％CO 2和50％N 2）通过实验和数值模拟研究了层流燃烧特性。通过球形膨胀火焰法在环境条件下实验测量了当量比为0.6到1.4的七种生物质衍生气体的层流燃烧速度（LBV）。将基于线性和非线性外推法获得的实验结果与文献中的数据以及四个详细的化学动力学模型（FFCM-1，GRI 3.0，USC II，San Diego 2016）的预测进行了比较。结果表明，混合物中当量比的增加或H 2分数的减少有利于减小通过线性和非线性外推法获得的LBV差。随着H 2的增加在混合气中，高热扩散燃料显着提高了LBV，最大LBV向着燃料丰富的一侧倾斜。对于CH 4分数高于H 2的混合物，其LBV最低，但绝热温度和热量释放较高。四个模型的预测表明，对于所有不同的成分混合物，San Diego 2016在精益方面都高估了。FFCM-1和GRI 3.0与富含H 2的混合物的实验测得的LBV更好地匹配。随着CH 4分数相对于H 2的增加，USC II的预测在富裕方面略有减少，与实验数据相比，化学计量条件下的所有预测都被过度预测。在Φ= 0.8和1.2的不同组成的混合物的火焰上进行了敏感性分析，发现在混合物中添加CH 4馏分后，R1逐渐成为最主要的反应，对LBV的影响更大。此外，分析了化学计量条件下不同组成混合物的反应路径和放热情况。研究了不同当量比下可变组成混合物的马克斯坦长度。这表明Markstein长度随着CH 4的增加而逐渐减小。 因此，在燃料中，延伸的火焰速度更容易受到火焰延伸率的影响，并且火焰稳定性降低。
更新日期：2020-05-07
中文翻译：
高N2和CO2浓度下可变组成的CO / H2 / CH4混合物层流燃烧特性的实验和模型分析
可变组成CO的效果/ H 2 / CH 4混合物（15％-20％CO，5％-20％H 2，0％-15％CH 4）在高稀释比（15％CO 2和50％N 2）通过实验和数值模拟研究了层流燃烧特性。通过球形膨胀火焰法在环境条件下实验测量了当量比为0.6到1.4的七种生物质衍生气体的层流燃烧速度（LBV）。将基于线性和非线性外推法获得的实验结果与文献中的数据以及四个详细的化学动力学模型（FFCM-1，GRI 3.0，USC II，San Diego 2016）的预测进行了比较。结果表明，混合物中当量比的增加或H 2分数的减少有利于减小通过线性和非线性外推法获得的LBV差。随着H 2的增加在混合气中，高热扩散燃料显着提高了LBV，最大LBV向着燃料丰富的一侧倾斜。对于CH 4分数高于H 2的混合物，其LBV最低，但绝热温度和热量释放较高。四个模型的预测表明，对于所有不同的成分混合物，San Diego 2016在精益方面都高估了。FFCM-1和GRI 3.0与富含H 2的混合物的实验测得的LBV更好地匹配。随着CH 4分数相对于H 2的增加，USC II的预测在富裕方面略有减少，与实验数据相比，化学计量条件下的所有预测都被过度预测。在Φ= 0.8和1.2的不同组成的混合物的火焰上进行了敏感性分析，发现在混合物中添加CH 4馏分后，R1逐渐成为最主要的反应，对LBV的影响更大。此外，分析了化学计量条件下不同组成混合物的反应路径和放热情况。研究了不同当量比下可变组成混合物的马克斯坦长度。这表明Markstein长度随着CH 4的增加而逐渐减小。 因此，在燃料中，延伸的火焰速度更容易受到火焰延伸率的影响，并且火焰稳定性降低。
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