Ammonia Measurements with Femtosecond Two-Photon Laser-Induced Fluorescence in Premixed NH3/Air Flames
Ammonia Measurements with Femtosecond Two-Photon Laser-Induced Fluorescence in Premixed NH3/Air Flames
复制标题
在预混合 NH3/空气火焰中使用飞秒双光子激光诱导荧光测量氨
DOI：
10.1021/acs.energyfuels.9b02121
复制
发表时间：
2020-02-01
期刊：
影响因子：
5.3
通讯作者：
Li, Zhongshan
中科院分区：
文献类型：
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作者：
Liu, Jixu;Gao, Jiang;Li, Zhongshan
氨（NH3）可以作为氢载体，是未来无碳经济中化石燃料的有前途的替代品。可行的远程、非侵入式氨气原位检测技术将为发展氨气清洁燃烧提供有力支撑。在这里，我们演示了飞秒双光子激光诱导荧光 (fs-TPLIF) 技术，可在层流预混合 NH3/空气火焰中进行无干扰原位 NH3 测量。在~565 nm处观察到NH3的双头带，验证了fs-TPLIF在燃烧环境中测量NH3的可行性。获得了具有高效信噪比的单次 NH3 fs-TPLIF 图像。还得到了反应区厚度随NH3火焰当量比的变化。由于飞秒激光的线宽较宽，因此还可以观察到 OH 荧光和 NH3 荧光。分析了 fs-TPLIF 仅用一根激光同时测量 NH3 和 OH 的潜力。研究了 NH3 和 NH 发射的激光功率依赖性。还讨论了火焰中 NH3、NH 和 OH 的径向分布。这项工作是fs-TPLIF在燃烧环境中测量NH3的首次尝试，结果表明fs-TPLIF是燃烧诊断中NH3测量的可行工具。 （较少的）
Ammonia (NH3), which can be a hydrogen carrier, is a promising alternative to fossil fuels in the future carbon-free economy. In situ techniques feasible for the remote and non-intrusive detection of NH3 will provide strong support for developing clean NH3 combustion. Here, we demonstrated a femtosecond two-photon laser-induced fluorescence (fs-TPLIF) technique for interference-free in situ NH3 measurements in laminar premixed NH3/air flames. The two-head band of NH3 at ∼565 nm was observed, which verifies the feasibility of fs-TPLIF for NH3 measurements in a combustion environment. The single-shot NH3 fs-TPLIF images with efficient signal-to-noise ratios were obtained. The variation of the thickness of the reaction zone with the equivalence ratio of NH3 flames was also obtained. As a result of the broad line width of the femtosecond laser, the OH fluorescence was also observed together with the NH3 fluorescence. The potential of fs-TPLIF for simultaneous measurements of NH3 and OH with only one laser was analyzed. The laser power dependence of NH3 and NH emissions was investigated. The radial distributions of NH3, NH, and OH in the flame were also discussed. This work is the first attempt of fs-TPLIF for NH3 measurements in a combustion environment, and the results indicate that fs-TPLIF is a feasible tool for NH3 measurements in combustion diagnostics. (Less)