Mole fraction measurement through a transparent quarl burner using filtered Rayleigh scattering

Krishna Yedhu; Elbaz Ayman M.; Yue Yuanfu; Magnotti Gaetano

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Mole fraction measurement through a transparent quarl burner using filtered Rayleigh scattering

机译：摩尔分数测量通过透明Quall燃烧器使用过滤瑞利散射

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A filtered Rayleigh scattering system is developed and applied to measure the mole fraction of methane in a methane-air swirl flow through a transparent conical quartz quarl. Light scattering from the location where the laser beam is incident on the surface of the quarl is orders of magnitudes larger than Rayleigh scattering from the gas mixture of interest. This diffusive scattering is suppressed using molecular absorption by an iodine cell and using spatial filtering by an optical aperture. Residual stray light accounted for up to 5% of the total signal and had to be removed for accurate measurements. The flow consisted of a nonpremixed mixture of methane and air in the central jet surrounded by a strong swirling air flow. Measurements were conducted at a height of 4 rum from the fuel tube's exit for six different conditions of the swirl flow to demonstrate the ability of the instrument to study the effects of swirl strength and fuel flow rate on the mixing process. By using a four-leg pulse stretcher to allow higher laser energies in the probe volume, large collection optics and a reference iodine cell to monitor laser wavelength variations, standard deviations of similar to 0.006 in air and similar to 0.012 in a laminar methane flow were achieved for mole fraction measurements. (C) 2019 Optical Society of America

机译：开发并施加过滤的瑞利散射系统，以通过透明锥形石英Quarl测量甲烷空气旋流中的甲烷的摩尔分数。从激光束入射在Quarl的表面上的位置的光散射是从感兴趣的气体混合物的瑞利散射大的级别。使用碘细胞的分子吸收并使用光学孔径使用空间滤波来抑制该扩散散射。残留的杂散光占总信号的5％，并且必须除去准确测量。流动由中央射流中的甲烷和空气的非甲烷和空气组成。在燃料管出口的六个不同条件的旋流中的六个不同条件下进行测量，以证明仪器研究旋流强度和燃料流速对混合过程的影响的能力。通过使用四腿脉冲担架探针体积中的较高激光能量，大集合光学器件和参考碘电池监测激光波长变化，在空气中类似于0.006的标准偏差，在层流甲烷流动中类似于0.012实现摩尔分数测量。（c）2019年光学学会

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来源
《Applied optics》 |2019年第20期|共12页
作者
Krishna Yedhu; Elbaz Ayman M.; Yue Yuanfu; Magnotti Gaetano;
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King Abdullah Univ Sci &

Technol Clean Combust Res Ctr Thuwal 23955 Saudi Arabia;

King Abdullah Univ Sci &

Technol Clean Combust Res Ctr Thuwal 23955 Saudi Arabia;

King Abdullah Univ Sci &

Technol Clean Combust Res Ctr Thuwal 23955 Saudi Arabia;

King Abdullah Univ Sci &

Technol Clean Combust Res Ctr Thuwal 23955 Saudi Arabia;

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正文语种 eng
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Mole fraction measurement through a transparent quarl burner using filtered Rayleigh scattering

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