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TEMPERATURE IMAGING IN A SUPERSONIC FREE JET OF COMBUSTION GASES WITH TWO-LINE OH FLUORESCENCE

机译:两行OH荧光的超音速燃烧气室中的温度成像

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Temperature measurements were performed in a shock-tunnel-generated free jet of hydrogen/oxygen reaction products diluted in argon with a nonsimultaneous, two-excitation-line planar laser-induced fluorescence technique with the hydroxyl radical (OH) as a tracer. Single-shot images were obtained with broadband excitation of isolated transitions in the A (2) Sigma(+) <-- X (II)-I-2(1, 0) band of OH near 282 nm, with broadband, temporally integrated detection of the resulting nonresonant emission. A measurement of the fluorescence lifetime in the free jet showed no variation with excited rotational level, allowing the rotational temperature to be obtained from the ratio of single-shot images with laser excitation of different rovibronic transitions. [References: 70]
机译:温度测量是在冲击隧道产生的氢气/氧气反应产物在氩气中稀释的自由射流中进行的,采用的是非同步的,两条激发线的平面激光诱导荧光技术,其中的羟基自由基(OH)为示踪剂。通过宽带激发在282 nm附近的OH的A(2)Sigma(+)<-X(II)-I-2(1,0)波段中的孤立跃迁获得宽带激发的单次图像检测产生的非共振发射。在自由射流中荧光寿命的测量结果表明,在激发的旋转能级下没有变化,从而可以从具有不同电子振动跃迁的激光激发的单次图像的比率中获得旋转温度。 [参考:70]

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