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首页> 美国卫生研究院文献>Journal of Advanced Research >Experimental and modeling study on effects of N2 and CO2 on ignition characteristics of methane/air mixture
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Experimental and modeling study on effects of N2 and CO2 on ignition characteristics of methane/air mixture

机译：氮气和二氧化碳对甲烷/空气混合物着火特性影响的实验和模型研究

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The ignition delay times of methane/air mixture diluted by N2 and CO2 were experimentally measured in a chemical shock tube. The experiments were performed over the temperature range of 1300–2100 K, pressure range of 0.1–1.0 MPa, equivalence ratio range of 0.5–2.0 and for the dilution coefficients of 0%, 20% and 50%. The results suggest that a linear relationship exists between the reciprocal of temperature and the logarithm of the ignition delay times. Meanwhile, with ignition temperature and pressure increasing, the measured ignition delay times of methane/air mixture are decreasing. Furthermore, an increase in the dilution coefficient of N2 or CO2 results in increasing ignition delays and the inhibition effect of CO2 on methane/air mixture ignition is stronger than that of N2. Simulated ignition delays of methane/air mixture using three kinetic models were compared to the experimental data. Results show that GRI_3.0 mechanism gives the best prediction on ignition delays of methane/air mixture and it was selected to identify the effects of N2 and CO2 on ignition delays and the key elementary reactions in the ignition chemistry of methane/air mixture. Comparisons of the calculated ignition delays with the experimental data of methane/air mixture diluted by N2 and CO2 show excellent agreement, and sensitivity coefficients of chain branching reactions which promote mixture ignition decrease with increasing dilution coefficient of N2 or CO2.
机译：在化学冲击管中实验测量了被N2和CO2稀释的甲烷/空气混合物的点火延迟时间。实验在1300-2100 K的温度范围，0.1-1.0 MPa的压力范围，0.5-2.0的当量比范围内进行，稀释系数分别为0％，20％和50％。结果表明，温度的倒数与点火延迟时间的对数之间存在线性关系。同时，随着点火温度和压力的增加，甲烷/空气混合物的实测点火延迟时间减少。此外，N 2或CO 2稀释系数的增加导致点火延迟的增加，并且CO 2对甲烷/空气混合物点火的抑制作用比N 2强。使用三种动力学模型对甲烷/空气混合物的模拟点火延迟进行了比较。结果表明，GRI_3.0机制对甲烷/空气混合物的点火延迟提供了最好的预测，并被选择用于识别N2和CO2对甲烷/空气混合物的点火延迟的影响以及关键的基本反应。计算的点火延迟与N2和CO2稀释的甲烷/空气混合物的实验数据的比较显示出极好的一致性，并且随着N2或CO2稀释系数的增加，促进混合物点火的支链反应的敏感性系数降低。

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