Visualization of CN by the use of planar laser-induced fluorescence in a cross section of an unseeded turbulent CH(4)-air flame.
CN is known to be the important species in forming NO(x) in hydrocarbon-air flames, and we describe the qualitative mapping of the CN distribution of the order of less than 1 in 10(6) at atmospheric pressure in a cross section of an unseeded turbulent CH(4)-air flame by the use of a single-shot laser pulse with planar laser-induced fluorescence. We obtained the results by comparing the different excitation-detection schemes to find the most appropriate scheme for visualization. In addition, the images obtained have good spatial resolution of 200 µm. Based on a laminar flame experiment with the same optical systems, it is observed that the CN distribution zone is located outside of the inner cone even at atmospheric pressure.
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Hirano
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Tsujishita