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介绍了利用拉曼散射测量燃烧流场温度及组分浓度的物理方法和实验测量结果。利用可调谐的 Kr F准分子激光激发振动拉曼散射 (VRS)测量了甲烷 -空气燃烧火焰内不同空间的主要组分分子 (CH4 、N2 、O2 、H2 O等 )浓度及温度 ,测量误差小于 10 % ;另外用 N2 的拉曼谱拟合测量了火焰的温度 ,测量精度高于 5%。在实验中采用了偏振技术及波长调谐提高了信噪比和测量精度。
The physical methods and experimental measurement results of Raman scattering for measuring the temperature and concentration of the combustion flow field are introduced. The concentration and temperature of the main component molecules (CH4, N2, O2, H2 O, etc.) in different spaces in the methane-air combustion flame were measured by tunable Kr F excimer laser vibrating Raman scattering (VRS) 10%. In addition, the Raman spectrum of N2 was used to measure the flame temperature, and the measurement accuracy was higher than 5%. Polarization techniques and wavelength tuning are used in the experiment to improve signal-to-noise ratio and measurement accuracy.