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用平面激光诱导荧光 (PLIF)技术测量平面火焰炉、狭缝火焰炉的单脉冲激光诱导OH荧光。由平面荧光图可得到氢氧基相对浓度分布和它的宽度。对于扩散火焰 ,高温区在OH带内侧 ;而对于预混火焰 ,二者基本一致。湍流火焰的PLIF图则清晰地显示出火焰面的不规则性。氢氧基的PLIF图像是研究火焰结构和流场的有力工具。
The single-pulsed laser-induced OH fluorescence was measured by planar laser-induced fluorescence (PLIF) technique in planar flame furnaces and slit flame furnaces. The relative concentration distribution of hydroxyl group and its width can be obtained from the plane fluorescence chart. For the diffusion flame, the high temperature zone is inside the OH zone, whereas for the premixed flame the two are essentially the same. The PLIF plot of turbulent flames clearly shows the flames’ surface irregularities. The hydrogen-based PLIF image is a powerful tool for studying flame structures and flow fields.