New imaging capabilities for topology in prevaporized, liquid-fuel flames are presented with the application of CH-radical planar laser-induced fluorescence (PLIF) using the C²Σ⁺-X²Π (v′=0, v″=0) band. Imaging of turbulent flame structure for ethanol, n-heptane, n-dodecane, and kerosene (JP-8) fuels has been conducted in jet flames using a piloted McKenna burner with a central jet tube. This work presents the first application of CH PLIF for the study of full flame structure and curvature effects with prevaporized liquid fuels, particularly n-dodecane and kerosene. Liquid fuel structure is also compared to results with methane and ethylene. Results show that good signal-to-noise ratio (SNR) is achieved for all fuels, and the method is feasible in the presence of a dilute droplet field, despite the resonant nature of the technique. Reaction-zone structures clearly depict evidence of nonequidiffusive (Le ≠ 1) effects: strong variation in CH fluorescence is observed in regions of high curvature. Simultaneous excitation of the OH radical is also possible with prevaporized liquid fuels, for combined imaging of the reaction and heat-release zones. In kerosene flames, with aromatic species, fuel fluorescence may also be simultaneously captured, in addition to that from CH and OH, providing information on vapor localization.

在prevaporized，液体燃料火焰拓扑新成像能力使用的是C呈现CH自由基平面激光诱导荧光（PLIF）的应用² Σ ⁺ -X ² Π（V' = 0，V“= 0）频段。乙醇，正庚烷，正十二烷和煤油（JP-8）燃料的湍流火焰结构成像已通过带有中央喷射管的先导McKenna燃烧器在喷射火焰中进行。这项工作是CH PLIF在研究预蒸发液体燃料（尤其是正十二烷和煤油）的全火焰结构和曲率效应方面的首次应用。还将液体燃料的结构与甲烷和乙烯的结果进行了比较。结果表明，所有燃料均实现了良好的信噪比（SNR），尽管该技术具有共振特性，但该方法在存在稀释液滴场的情况下仍可行。反应区结构清楚地描述了不扩散的证据（Le≠1）效应：在高曲率区域观察到CH荧光的强烈变化。对于预蒸发的液体燃料，还可以同时激发OH自由基，以对反应区和放热区进行组合成像。在煤油火焰中，带有芳香族物质的燃料，除了可以从CH和OH发出的荧光外，还可以同时捕获燃料的荧光，从而提供有关蒸汽定位的信息。