Spatially resolved broadband absorption spectroscopy measurements of temperature and multiple species (NH, OH, NO, and NH3) in atmospheric-pressure premixed ammonia/methane/air flames
Spatially resolved broadband absorption spectroscopy measurements of temperature and multiple species (NH, OH, NO, and NH3) in atmospheric-pressure premixed ammonia/methane/air flames
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大气压预混合氨/甲烷/空气火焰中温度和多种物质（NH、OH、NO 和 NH3）的空间分辨宽带吸收光谱测量
DOI：
10.1016/j.fuel.2022.126073
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发表时间：
2023-01
期刊：
影响因子：
7.4
通讯作者：
Yanjun Du
中科院分区：
文献类型：
--
作者：
Xinyu Yang;Zhimin Peng;Yanjun Ding;Yanjun Du
NH、OH、NO、NH3等多组分的浓度分布和温度分布对研究氨/甲烷燃烧机理具有重要意义。然而，在常压氨/甲烷火焰中同时测量这些参数的研究很少。在这项工作中，我们首次提出了一种基于紫外宽带吸收光谱(BAS)的测量方法，实现了温度和多种物种浓度(OH、NH、NO的绝对浓度和NH3的相对浓度)的同时测量。由于在紫外区对电子跃迁有很强的吸收，该方法具有较低的检测下限。以NH自由基为例，在1700K时，检测下限低至31 ppb，由于OH宽带吸收的多线光谱，也获得了较高的温度测量灵敏度。此外，还提出了一种合适的策略来分离在225 nm附近的NO和NH3光谱，从而能够同时测定这两种物种。我们建立了一个基于BAS方法的光学系统，空间分辨率约为0.1 mm，用于对大气中氨/甲烷/空气火焰的温度和多组分的空间分辨测量。研究了不同当量比(0.9、1.0和1.1)和燃料中不同氨摩尔分数(10%、30%和50%)下的氨/甲烷火焰。NH_3和NH_3浓度随着氨摩尔分数的增加而线性增加，而OH和NO浓度则随着当量比的增加而呈类似的下降趋势。实验测量的温度和多组分浓度与使用CRECK模型组的机理的计算流体力学(CFD)模拟进行了比较。在绝对值、空间分布以及当量比和氨摩尔分数的变化上取得了良好的一致性。
The temperature and multi-species concentration distributions, including NH, OH, NO, and NH 3, are of great importance to the research on ammonia/methane combustion mechanisms. However, there is scarce research simultaneously measuring these parameters in atmospheric-pressure ammonia/methane flames. In this work, we proposed a measurement method based on the ultraviolet broadband absorption spectroscopy (BAS) to realize the simultaneous measurement of temperature and multiple species concentrations for the first time (absolute concentrations for OH, NH, and NO, and relative concentrations for NH 3). Due to the strong absorption of the electronic transitions in the ultraviolet range, the proposed method offers low detection limits for concentration measurements. Taking NH radicals as an example, the detection limit is as low as 31 ppb at 1700 K. High sensitivity for temperature measurements is also achieved due to the multi-line spectra of OH broadband absorption. Moreover, a fitting strategy was proposed to separate the NO and NH 3 spectra near 225 nm, enabling a simultaneous determination of both species. We established an optical system based on the proposed BAS method with a spatial resolution of approximately 0.1 mm to perform spatially resolved measurements of temperature and multiple species on atmospheric ammonia/methane/air flames. The ammonia/methane flames were investigated at different equivalence ratios (0.9, 1.0, and 1.1) and different ammonia mole fractions in fuels (10%, 30%, and 50%). As investigated, NH and NH 3 concentrations increased linearly with increasing ammonia mole fractions, while OH and NO concentrations decreased in similar trends with increasing equivalence ratios. The experimentally measured temperature and multi-species concentrations were compared with computational fluid dynamics (CFD) simulations using the mechanism of the CRECK modeling group. Good agreements were achieved in absolute values, spatial profiles, and variations with equivalence ratios and ammonia mole fractions.
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