1维非稳腔空间增强探测CARS技术对稳态燃烧场温度的测量

Temperature measurement in stable combustion field with one-dimensional USED CARS

建立了1维非稳腔空间增强探测CARS实验系统,该系统由光源(YAG激光器、染料激光器)、实验光路和信号采集系统组成。分别测量了空气和化学平衡比为1,甲烷流量为0.7 L/min的甲烷-空气预混火焰中的氮气Q支的CARS实验谱。给出了火焰不同高度处小范围内的温度分布结果,并对实验结果进行了分析,结果表明:预混火焰温度随高度的增加呈下降趋势,测量结果的不确定度优于7%。该技术可用于稳态燃烧场温度的测量。

The one dimensional（I-D） USED CARS experimental system was constructed. The I-D CARS spectra of N2 Q- branch were obtained from the air as well as premixed CH4/Air flame with the equivalence ratio phi being 1, the flux per minute of methane being 0.7 L, at the atmospheric pressure. The data were analyzed by CARS software, and temperature was calculated. The temperature distribution in small range at various height above the burner was given in four fragments. The temperature in the flame decreased with increasing height, not only in the scale of the width of laser sheet, but also in the whole flame, by the influence of the air around the burner. The uncertainty of the experimental result is less than 7%. This technology can be used to measure the temperature in stable combustion field.