Online measurement of hydrogen/air flame equivalence ratio using femtosecond laser-induced plasma spectroscopy

IF 2 3区物理与天体物理 Q3 OPTICS

Applied Physics B Pub Date : 2025-06-27 DOI:10.1007/s00340-025-08517-9

Zheng Lu, Zhifeng Zhu, Xiaofeng Li, Lei Zhang, Tengfei Wu, Lei Han, Qiang Gao, Bo Li

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Abstract

With the growing application of hydrogen as a clean energy source, the development of accurate, real-time, and multi-dimensional equivalence ratio measurement for hydrogen combustion has become imperative. This is critical for combustion control, optimization of hydrogen engine efficiency, and reduction of nitrogen oxide emissions. Here, we used femtosecond laser-induced plasma spectroscopy to perform online measurements of the equivalence ratio in H₂/air premixed flames. First, calibration experiments were conducted to establish a quantitative relationship between spectral signals of H₆₅₆/O₇₇₇ and equivalence ratios of H₂/air premixed flames. Based on the calibration curve, 1D online equivalence ratio measurements were performed in both laminar and turbulent premixed flames. Furthermore, local equivalence ratio measurements at different heights were carried out to analyze the spatial distribution of the equivalence ratio in the jet flame. These results were compared with the corresponding ANSYS FLUENT simulation data, showing a good agreement in the trend of the equivalence ratio distribution. This study not only provides a new tool for fundamental research in hydrogen combustion but also offers technical support for future numerical simulations and engineering applications related to hydrogen combustion.

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利用飞秒激光诱导等离子体光谱在线测量氢气/空气火焰等效比

随着氢作为清洁能源的应用日益广泛，开发准确、实时、多维度的氢燃烧当量比测量方法势在必行。这对于燃烧控制、优化氢发动机效率和减少氮氧化物排放至关重要。在这里，我们使用飞秒激光诱导等离子体光谱对H2/空气预混火焰中的等效比进行在线测量。首先进行标定实验，建立H656/O777光谱信号与H2/空气预混火焰等效比之间的定量关系。基于标定曲线，对层流和湍流预混火焰进行了一维在线等效比测量。此外，通过不同高度的局部等效比测量，分析了等效比在射流火焰中的空间分布。这些结果与相应的ANSYS FLUENT仿真数据进行了比较，在等效比分布的趋势上有很好的一致性。该研究不仅为氢燃烧的基础研究提供了新的工具，而且为今后氢燃烧的数值模拟和工程应用提供了技术支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics B 物理-光学

CiteScore

4.00

自引率

4.80%

发文量

202

审稿时长

3.0 months

期刊介绍： Features publication of experimental and theoretical investigations in applied physics Offers invited reviews in addition to regular papers Coverage includes laser physics, linear and nonlinear optics, ultrafast phenomena, photonic devices, optical and laser materials, quantum optics, laser spectroscopy of atoms, molecules and clusters, and more 94% of authors who answered a survey reported that they would definitely publish or probably publish in the journal again Publishing essential research results in two of the most important areas of applied physics, both Applied Physics sections figure among the top most cited journals in this field. In addition to regular papers Applied Physics B: Lasers and Optics features invited reviews. Fields of topical interest are covered by feature issues. The journal also includes a rapid communication section for the speedy publication of important and particularly interesting results.