利用拉曼散射测量燃烧场的组分浓度及温度

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KrF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、H2O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。

Raman Scattering Measurements for Multi-Species and Temperature in Combustion

Using a narrow band tunable KrF excimer laser as a spontaneous vibrational Raman scattering (SVRS) source, spatially resolved Raman scattering is used to measure the single shot concentrations of all major species (N 2, O 2, H 2O, CH 4) in methane air flames. A simple polarization technique and optimal tuning of the narrow band KrF excimer laser are used for the minimization of OH and O 2 fluorescence interference to improve the precision. Moreover a time averaged temperature measurement technique is presented to fit the N 2 spectrum to theoretical spectrum, by considering the fact that the Stokes spectrum of N 2 will broden and the peak wavelength will blue shift when temperature increases. The spectral fit precision is less than 5% at 1500 K.