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首页> 外文期刊>Applied optics >Diode-laser wavelength-modulation absorption spectroscopy for quantitative in situ measurements of temperature and OH radical concentration in combustion gases
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Diode-laser wavelength-modulation absorption spectroscopy for quantitative in situ measurements of temperature and OH radical concentration in combustion gases

机译：二极管激光波长调制吸收光谱法，用于现场定量测量燃烧气体中的温度和OH自由基浓度

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摘要

The in situ quantitative profiles of temperature and OH radical concentration in a postflame region of methane-air premixed counterflow flames were measured by wavelength modulation spectroscopy with a 1.5-μm external cavity diode laser. The second harmonic (2f) signal was generated from absorption by overtone vibrational-rotational transitions of OH: the II_(3/2) (v′, v″)=(2, 0) P11.5e (v_(0)=6421.35 cm~(-1)) or the II_(3/2) (v′, v″)=(3, 1) P5.5f(v_(0)=6434.61 cm~(-1)) transitions. The absorption occurred in the postflame region between methane-air premixed twin flames stabilized in a two-dimensional laminar counterflow burner (Tsuji burner) with a 60-mm line-of-sight path length. The temperature and OH concentration profiles at an equivalence ratio of φ=0.85 were determined by least-squares fitting of theoretical 2f line shapes to the experimental counterparts and by calculation of the ratio of the line intensities of the two different OH transitions (two-line thermometry). The measured temperature and OH concentration profiles were cross checked by Rayleigh scattering thermometry, thermocouple measurements, and two-dimensional numerical prediction of premixed combustion by use of a detailed chemical kinetic mechanism. The measurements and the prediction showed reasonable agreement.
机译：使用1.5μm外腔二极管激光器通过波长调制光谱法测量甲烷-空气预混逆流火焰的火焰后区域中温度和OH自由基浓度的原位定量分布。二次谐波（2f）信号是通过OH的泛音振动-旋转跃迁吸收产生的：II_（3/2）（v'，v''）=（2，0）P11.5e（v_（0）= 6421.35 cm〜（-1））或II_（3/2）（v'，v''）=（3，1）P5.5f（v_（0）= 6434.61 cm〜（-1））过渡。吸收发生在甲烷-空气预混双火焰之间的后火焰区域，该火焰在二维层流逆流燃烧器（Tsuji燃烧器）中稳定，视线路径长度为60 mm。通过理论上的2f线形与实验对应物的最小二乘拟合以及通过计算两个不同OH跃迁的线强度之比（两线）来确定当量比为φ= 0.85时的温度和OH浓度分布温度计）。通过使用详细的化学动力学机制，通过瑞利散射测温法，热电偶测量和预混燃烧的二维数值预测，对测得的温度和OH浓度分布进行了交叉检查。测量和预测显示合理的一致性。

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