Measurements of propane–O2–Ar laminar flame speeds at temperatures exceeding 1000 K in a shock tube
Measurements of propane–O2–Ar laminar flame speeds at temperatures exceeding 1000 K in a shock tube
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DOI：
10.1016/j.proci.2022.07.191
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发表时间：
2022-09
影响因子：
3.4
通讯作者：
A. J. Susa;Lingzhi Zheng;R. Hanson
中科院分区：
文献类型：
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作者：
A. J. Susa;Lingzhi Zheng;R. Hanson
在激波管中，在296 - 1234 K的未燃气体温度和近大气压力下，对氧-氩氧化器中化学计量比丙烷的层流火焰速度（SL）进行了测量。非侵入式激光诱导击穿被用来点燃后的反射激波通道的扩展火焰。在最近实施的侧壁成像火焰试验段（SWIFT）中，使用纹影成像记录火焰传播。在一个完善的方法来解释火焰的扭曲和轻微的残余运动的后反射激波气体，面积平均配方的线性曲率模型（AA-LC模型）推导出用于外推火焰数据为零拉伸。测量S L值提取使用AA-LC模型密切同意与以前的实验测量进行常规动力学激波管（CKST）使用小得多的火焰内核，提供证据的早期数据已点火影响。低于1050 K的化学影响极限，实验S L值落在用详细的AramcoMech 3.0动力学机制和来自NUIG和圣地亚哥的丙烷特异性机制模拟的值的范围内，但表现出比机制预测的更强的温度依赖性。在宽的温度范围内，目前的数据，无处不在的幂律形式的经验拟合被证明是不足以捕捉的SL温度依赖性，一个非阿耳忒弥斯形式表现良好。在SWIFT中进行的火焰速度测量的不确定性平均为3.0%和4.4%的静态和后反射冲击条件下进行的实验，分别从CKST实验的5.8%的平均不确定性减少。这项工作是在发展高温火焰速度测量实验能力方面向前迈出的重要一步。目前的结果说明了激波管火焰速度方法的潜在价值，提供有用的测量通知动力学模型的调整和验证的条件下，实验数据是以前无法获得的。
Laminar flame speed (S L) measurements of stoichiometric propane in an oxygen-argon oxidizer were performed in a shock tube at unburned-gas temperatures of 296–1234 K and near-atmospheric pressures. Non-intrusive laser-induced breakdown is used to ignite expanding flames following the reflected-shock passage. Flame propagation is recorded using schlieren imaging in a recently implemented side-wall imaging flame test section (SWIFT). In a refined approach to account for flame distortion and the slight residual motion of the post-reflected-shock gas, an area-averaged formulation of the linear-curvature model (the AA-LC model) is derived for use extrapolating flame data to zero stretch. Measured S L values extracted using the AA-LC model closely agree with previous experimental measurements performed in a conventional kinetics shock tube (CKST) using much smaller flame kernels, providing evidence of the earlier data having been ignition affected. Below the chemistry-affected limit of 1050 K, experimental S L values fall in the range of values simulated with the detailed AramcoMech 3.0 kinetic mechanism and propane-specific mechanisms from NUIG and San Diego but exhibit a stronger temperature dependence than predicted by the mechanisms. Over the wide temperature range of the present data, the ubiquitous power-law form of empirical fit is shown to be inadequate for capturing the S L temperature dependence; a non-Arrhenius form is shown to perform favorably. The uncertainties of flame speed measurements performed in the SWIFT average 3.0% and 4.4% for experiments performed under static and post-reflected-shock conditions, respectively, a reduction from the 5.8% average uncertainty of CKST experiments. This work represents a significant step forward in the development of experimental capabilities for high-temperature flame speed measurements. The present results illustrate the potential value of the shock-tube flame speed method to provide measurements useful for informing kinetic model tuning and validation at conditions for which experimental data were not previously obtainable.