Scalar profiles and NO formation in laminar opposed-flow partially premixed methane/air flames
Scalar profiles and NO formation in laminar opposed-flow partially premixed methane/air flames
复制标题
DOI：
10.1016/s0010-2180(01)00313-3
复制
发表时间：
2001-11-01
影响因子：
4.4
通讯作者：
Chen, JY
中科院分区：
文献类型：
--
作者：
Barlow, RS;Karpetis, AN;Chen, JY
温度测量。本文采用非侵入式拉曼散射和激光诱导荧光技术，对甲烷和空气的层流对置部分预混火焰中的主要组分（N-2、O-2、CH 4、CO2、H2O、CO和H-2）、OH和NO进行了研究。燃料侧当量比为phi = 3.17的火焰。2.17.和1.8在低速空气流中的多孔圆柱形燃烧器（Tsuji燃烧器）上稳定。结果进行了比较与计算使用的版本的桑迪亚层流火焰代码，制定的筑几何形状，包括一个光学薄的辐射治疗。由于未测量速度分布，因此调整每次计算中的应变率以匹配混合物分数的测量分布。测量的温度和物种的质量分数的配置文件，然后与使用GRI-Mech 2.11和3.0的化学机制，以及详细的机制从米勒的计算结果进行比较。所有这三种机制都与实验结果一致，主要物种通常在实验不确定性范围内。关于NO的形成。三种机构的相对性能取决于燃料侧当量比。GRI-Mech 2.11在贫燃和近化学计量条件下与测量的NO水平相当吻合。但它在富燃料条件下预测了NO水平。GRI-Mech 3.0显著高估了phi = 3.17和2.17火焰的峰值NO水平。但它与φ = 1.8火焰中的测量结果相当一致。米勒机制给出了良好的协议与测量的NO水平在φ = 3.17火焰。绝热计算和辐射计算的比较表明，辐射对部分预混艾德火焰的宽度和结构有显著影响。以及产生的NO水平。
Measurements of temperature. the major species (N-2, O-2, CH4, CO2, H2O, CO, and H-2), OH, and NO are obtained in steady laminar opposed-flow partially premixed flames of methane and air, using the non-intrusive techniques of Raman scattering and laser-induced fluorescence. Flames having fuel-side equivalence ratios of phi = 3.17. 2.17. and 1.8 are stabilized on a porous cylindrical burner (Tsuji burner) in a low-velocity flow of air. Results are compared with calculations using a version of the Sandia laminar flame code that is formulated for the Tsuji geometry and includes an optically thin treatment of radiation. Because velocity profiles are not measured, the strain rate in each calculation is adjusted to match the measured profile of the mixture fraction. Measured profiles of temperature and species mass fractions are then compared with results of calculations using the GRI-Mech 2.11 and 3.0 chemical mechanisms, as well as a detailed mechanism from Miller. All three mechanisms give agreement with experimental results for the major species that is generally within experimental Uncertainty. With regard to NO formation. the relative performance of the three mechanisms depends on the fuel-Side equivalence ratio. GRI-Mech 2.11 gives reasonably good agreement with measured NO levels in lean and near-stoichiometric conditions. but it under predicts NO levels in fuel-rich conditions. GRI-Mech 3.0 significantly over predicts the peak NO levels the phi = 3.17 and 2.17 flames. but it yields relatively good agreement with measurements in the phi = 1.8 flame. The Miller mechanism gives good agreement with measured NO levels in the phi = 3.17 flame. but it progressively over predicts peak NO levels in the leaner flames, Comparisons of adiabatic and radiative calculations show that radiation can have a significant effect on the width and Structure of partially premix:ed flames. as well as on the levels of NO produced.