Simultaneous planar laser-induced fluorescence measurement of reactant NH3, radical NH, and pollutant NO in ammonia-hydrogen flames using a single dye laser

平面激光诱导荧光 激光器 激发 化学 波长 分析化学(期刊) 平面的 火焰结构 荧光 激光诱导荧光 分子物理学 材料科学 光学 燃烧 光电子学 燃烧室 物理化学 电气工程 物理 计算机图形学(图像) 工程类 有机化学 色谱法 计算机科学
作者
Guoqing Wang,Shixing Wang,Thibault F. Guiberti
出处
期刊:Combustion and Flame [Elsevier BV]
卷期号:256: 112981-112981 被引量:9
标识
DOI:10.1016/j.combustflame.2023.112981
摘要

The stability, local extinction, and NOx production of ammonia-hydrogen (NH3-H2) flames are significantly impacted by turbulence-chemistry interactions. A powerful technique to study these interactions is planar laser-induced fluorescence (PLIF). However, multi-scalar PLIF typically requires complex and expensive systems, with multiple laser sources. This study proposes a novel PLIF technique using a single dye laser to perform simultaneous, single-shot imaging of the reactant NH3, radical NH, and pollutant NO in NH3-H2 flames. According to the excitation scans and the emission spectra of NH3, NH, and NO, three wavelength couples can be used to image the three species simultaneously via two-photon excitation of NH3 C'−X (2,0), single-photon excitation of NH A3Π−X3Σ− (0,0) near 304 nm, and single-photon excitation of NO A2Σ+−X2Π (0,1) near 237 nm. Wavelengths near 237 nm and 304 nm are obtained simultaneously with only one dye laser by combining outputs of the frequency-doubling and frequency mixing units. NH3-, NH-, and NO-PLIF imaging performance is analyzed by quantifying the signal-to-noise ratios and detection limits. This technique is then used to visualize the structure of premixed and non-premixed flames over wide ranges of NH3 and H2 concentrations in the fuel blend. Results show that the premixed NH3-H2 flames have a compact structure, while the non-premixed flames exhibit a large gap between NH3- and NH-PLIF layers, where ammonia undergoes significant decomposition before reaching the reaction layer. The inner edge of the NO-PLIF layer overlaps well with the reaction layer represented by the NH-PLIF layer in all flames. The fully developed turbulent structure downstream of the NH3-H2 flame causes pinching-off of the premixed flame front and local extinction of the diffusion flame front.
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