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首页> 外文期刊>Optics Communications: A Journal Devoted to the Rapid Publication of Short Contributions in the Field of Optics and Interaction of Light with Matter >Simultaneous measurement of 2-dimensional H2O concentration and temperature distribution in premixed methane/air flame using TDLAS-based tomography technology
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Simultaneous measurement of 2-dimensional H2O concentration and temperature distribution in premixed methane/air flame using TDLAS-based tomography technology

机译：使用基于TDLAS的层析成像技术同时测量甲烷/空气预混火焰中二维H2O浓度和温度分布

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摘要

An innovative tomographic method using tunable diode laser absorption spectroscopy (TDLAS) and algebraic reconstruction technique (ART) is presented in this paper for detecting two-dimensional distribution of H2O concentration and temperature in a premixed flame. The collimated laser beam emitted from a low cost diode laser module was delicately split into 24 sub-beams passing through the flame from different angles and the acquired laser absorption signals were used to retrieve flame temperature and H2O concentration simultaneously. The efficiency of the proposed reconstruction system and the effect of measurement noise were numerically evaluated. The temperature and H2O concentration in flat methane/air premixed flames under three different equivalence ratios were experimentally measured and reconstruction results were compared with model calculations. Numerical assessments indicate that the TDLAS tomographic system is capable for temperature and H2O concentration profiles detecting even the noise strength reaches 3% of absorption signal. Experimental results under different combustion conditions are well demonstrated along the vertical direction and the distribution profiles are in good agreement with model calculation. The proposed method exhibits great potential for 2-0 or 3-D combustion diagnostics including non-uniform flames. (C) 2015 Elsevier B.V. All rights reserved.
机译：本文提出了一种使用可调谐二极管激光吸收光谱（TDLAS）和代数重建技术（ART）的创新层析成像方法，用于检测预混火焰中H2O浓度和温度的二维分布。从低成本二极管激光器模块发出的准直激光束被细分为24个子光束，它们以不同角度穿过火焰，并且所获取的激光吸收信号用于同时获取火焰温度和H2O浓度。数值评估了所提出的重建系统的效率和测量噪声的影响。实验测量了三种不同当量比下甲烷/空气预混扁平火焰中的温度和H2O浓度，并将重建结果与模型计算进行了比较。数值评估表明，即使噪声强度达到吸收信号的3％，TDLAS层析成像系统也能够检测温度和H2O浓度分布。沿垂直方向很好地证明了不同燃烧条件下的实验结果，其分布曲线与模型计算非常吻合。所提出的方法对于包括不均匀火焰的2-0或3-D燃烧诊断具有巨大的潜力。 （C）2015 Elsevier B.V.保留所有权利。

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