Temperature and OH concentration measurements by ultraviolet broadband absorption of OH(X) in laminar methane/air premixed flames
Temperature and OH concentration measurements by ultraviolet broadband absorption of OH(X) in laminar methane/air premixed flames
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DOI：
10.1016/j.fuel.2020.119666
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发表时间：
2021-03
期刊：
影响因子：
7.4
通讯作者：
Xinyu Yang;Zhimin Peng;Yanjun Ding;Yanjun Du
中科院分区：
文献类型：
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作者：
Xinyu Yang;Zhimin Peng;Yanjun Ding;Yanjun Du
我们报告了基于 OH 电子跃迁 (X 2 Π-A 2 Σ+) 的紫外 (UV) 宽带吸收光谱 (BAS) 的甲烷/空气预混合平焰中的温度和羟基 (OH) 浓度测量。在不同当量比（φ= 0.6、0.7、0.8、0.93 和 1.06）的燃烧器上方不同高度处获得温度和 OH 摩尔分数分布。结果与使用 AramcoMech 1.3 骨架机构的计算流体动力学 (CFD) 模拟非常吻合，验证了 BAS 测量的准确性。对于稳定火焰（φ= 0.6、0.7 和 0.8），平焰上方的温度均方根差均小于 16 K，OH 摩尔分数均小于 150 ppm。 BAS 结果也与可调谐二极管激光吸收光谱 (TDLAS) 测量结果一致，均方根温差为 31.5 K。实验和理论分析表明，UV BAS OH 检测限比红外 (IR) TDLAS 低两个数量级以上，并且 OH BAS 温度灵敏度远高于 TDLAS 测量中大多数线对的温度灵敏度。这些优点使 UV BAS 方法成为一种准确的燃烧诊断方法，其温度和 OH 浓度比 IR TDLAS 更准确。
We report temperature and hydroxyl (OH) concentration measurements in methane/air premixed flat flames based on ultraviolet (UV) broadband absorption spectroscopy (BAS) of the OH electronic transitions (X 2 Π-A 2 Σ+). The temperature and OH mole fraction distributions were obtained at different heights above the burner for various equivalence ratios (ϕ= 0.6, 0.7, 0.8, 0.93, and 1.06). The results agreed well with computational fluid dynamics (CFD) simulations using the AramcoMech 1.3 skeletal mechanism, which verifies the BAS measurement accuracy. For stable flames (ϕ= 0.6, 0.7, and 0.8), the root-mean-square differences above the flat flames were all less than 16 K for the temperature and 150 ppm for the OH mole fraction. The BAS results also agreed with tunable diode laser absorption spectroscopy (TDLAS) measurements with a root-mean-square temperature difference of 31.5 K. Experimental and theoretical analysis demonstrates that the UV BAS OH detection limit is more than two orders of magnitude lower than that for infrared (IR) TDLAS, and the OH BAS temperature sensitivity is much higher than that for most line pairs in TDLAS measurements. These advantages make the UV BAS method an accurate method for combustion diagnostics, with more accurate temperature and OH concentration than IR TDLAS.