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首页> 外文期刊>Combustion and Flame >Temperature and water measurements in flames using 1064 nm Laser-Induced Grating Spectroscopy (LIGS)
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Temperature and water measurements in flames using 1064 nm Laser-Induced Grating Spectroscopy (LIGS)

机译：使用1064nm激光诱导光栅光谱法（Ligs）的火焰中的温度和水测量

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摘要

Laser-Induced Grating Spectroscopy (LIGS) is applied to premixed CH4/air laminar flat flames under operating pressures of 1 to 6 bar. For the first time, temperature and water concentration have been acquired simultaneously in a reacting flow environment using LIGS. A 1064 nm pulsed laser is used as pump to generate a temporary stationary intensity grating in the probe volume. Water molecules in the flame products absorb the laser energy and generate a thermal grating if sufficiently high energies are delivered by the laser pulses, here more than 100 mJ per pulse. Such energies allow the electric field to polarize the dielectric medium, resulting in a detectable electrostrictive grating as well. This creates LIGS signals containing both the electrostrictive and the thermal contributions. The local speed of sound is derived from the oscillation frequency of LIGS signals, which can be accurately measured from the single shot power spectrum. Data show that the ratio between the electrostrictive and the thermal peak intensities is an indicator of the local water concentration. The measured values of speed of sound, temperature, and water concentration in the flames examined compare favorably with flame simulations with Chemkin, showing an estimated accuracy of 0.5 to 2.5% and a precision of 1.4-2%. These results confirm the potential for 1064 nm LIGS-based thermometry for high-precision temperature measurements of combustion processes. (C) 2019 The Authors. Published by Elsevier Inc. on behalf of The Combustion Institute.
机译：激光诱导的光栅光谱（LIGS）在1至6巴的操作压力下施加到预混合的CH4 /空气层状扁平火焰中。首次，使用Lig在反应流动环境中同时获得温度和水浓度。 1064nm脉冲激光器用作泵，以在探针体积中产生临时固定强度光栅。火焰产品中的水分子吸收激光能量并产生热光栅，如果激光脉冲递送足够高的能量，则在这里每次脉冲超过100mJ。这种能量允许电场偏振介质介质，从而导致可检测的电致伸缩光栅。这会产生包含电致伸缩性和热贡献的Lig信号。局部声速来自LIGS信号的振荡频率，可以从单射功率谱准确地测量。数据表明，电致伸缩性和热峰强度之间的比率是局部水浓度的指示。在火焰中测量的声音，温度和水浓度的值相比，良好地与Chemin的火焰模拟，显示估计精度为0.5％至2.5％，精度为1.4-2％。这些结果证实了1064nm Ligs的高精度温度测量的燃烧过程的电位。 （c）2019年作者。由elsevier公司发布代表燃烧研究所。

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